rekuiper-server 1.0.0-rc4

REST API, OpenAPI routes, Prometheus metrics, and streaming hub for rekuiper
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>rekuiper — Edge Stream &amp; IIoT Console</title>
  <style>
    :root {
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      --bg-surface: #FFFFFF;
      --bg-subtle: #F1F5F9;
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      --accent: #2563EB;
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      --accent-soft: #EFF6FF;
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      --emerald-text: #065F46;
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      --indigo-text: #3730A3;
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      --amber-text: #92400E;
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      --rose-text: #991B1B;
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      --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.03);
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      --radius-lg: 14px;

      --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
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    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      background-color: var(--bg-canvas);
      color: var(--text-primary);
      font-family: var(--font-sans);
      font-size: 14px;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    .tabular {
      font-variant-numeric: tabular-nums;
      font-feature-settings: "tnum";
    }

    /* Top Header */
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      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 30;
      padding: 0 24px;
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      justify-content: space-between;
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    .brand {
      display: flex;
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    .brand-logo {
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      color: var(--text-muted);
      font-weight: 400;
      border-left: 1px solid var(--border);
      padding-left: 10px;
    }

    .topbar-controls {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    /* Pills & Badges */
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 3px 10px;
      border-radius: 9999px;
      font-size: 12px;
      font-weight: 500;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .badge-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
    }

    .badge-emerald {
      background: var(--emerald-bg);
      color: var(--emerald-text);
      border-color: var(--emerald-border);
    }
    .badge-emerald .badge-dot { background: var(--emerald-dot); }

    .badge-indigo {
      background: var(--indigo-bg);
      color: var(--indigo-text);
      border-color: var(--indigo-border);
    }

    .badge-amber {
      background: var(--amber-bg);
      color: var(--amber-text);
      border-color: var(--amber-border);
    }
    .badge-amber .badge-dot { background: #F59E0B; }

    .badge-rose {
      background: var(--rose-bg);
      color: var(--rose-text);
      border-color: var(--rose-border);
    }
    .badge-rose .badge-dot { background: var(--rose-dot); }

    .badge-slate {
      background: var(--bg-subtle);
      color: var(--text-secondary);
      border-color: var(--border);
    }
    .badge-slate .badge-dot { background: var(--text-faint); }

    /* Buttons & Inputs */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.15s ease;
      border: 1px solid var(--border);
      background: var(--bg-surface);
      color: var(--text-primary);
      box-shadow: var(--shadow-xs);
    }

    .btn:hover:not(:disabled) {
      background: var(--bg-subtle);
      border-color: var(--border-strong);
    }

    .btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .btn-primary {
      background: var(--accent);
      color: #FFFFFF;
      border-color: var(--accent);
    }

    .btn-primary:hover:not(:disabled) {
      background: var(--accent-hover);
      border-color: var(--accent-hover);
    }

    .btn-danger {
      background: var(--rose-bg);
      color: var(--rose-text);
      border-color: var(--rose-border);
    }

    .btn-danger:hover:not(:disabled) {
      background: #FEE2E2;
    }

    .btn-sm {
      padding: 4px 8px;
      font-size: 12px;
    }

    .select-input, .text-input {
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      background: var(--bg-surface);
      color: var(--text-primary);
      font-size: 13px;
      font-family: var(--font-sans);
      outline: none;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
    }

    .select-input:focus, .text-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    }

    /* Main Container */
    .container {
      max-width: 1440px;
      width: 100%;
      margin: 0 auto;
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    /* KPI Strip */
    .kpi-grid {
      display: grid;
      grid-template-columns: repeat(6, minmax(0, 1fr));
      gap: 14px;
    }

    @media (max-width: 1200px) {
      .kpi-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    }
    @media (max-width: 700px) {
      .kpi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    }

    .kpi-card {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 16px;
      box-shadow: var(--shadow-xs);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 8px;
      position: relative;
      overflow: hidden;
    }

    .kpi-card.alert-card {
      border-color: var(--rose-border);
      background: linear-gradient(180deg, #FFFFFF 0%, #FFFBFB 100%);
    }

    .kpi-label {
      font-size: 12px;
      font-weight: 500;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .kpi-value {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: -0.03em;
      color: var(--text-primary);
      line-height: 1.1;
    }

    .kpi-sub {
      font-size: 12px;
      color: var(--text-secondary);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 4px;
    }

    /* Navigation Tabs */
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid var(--border);
      padding-bottom: 12px;
      gap: 16px;
      flex-wrap: wrap;
    }

    .tabs {
      display: flex;
      align-items: center;
      gap: 6px;
      background: var(--bg-subtle);
      padding: 4px;
      border-radius: 8px;
      border: 1px solid var(--border);
    }

    .tab-btn {
      border: none;
      background: transparent;
      color: var(--text-secondary);
      font-size: 13px;
      font-weight: 500;
      padding: 6px 14px;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.15s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .tab-btn:hover {
      color: var(--text-primary);
    }

    .tab-btn.active {
      background: var(--bg-surface);
      color: var(--text-primary);
      box-shadow: var(--shadow-xs);
    }

    .filter-group {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    /* Workspace Split Layout */
    .workspace {
      display: grid;
      grid-template-columns: 1fr;
      gap: 20px;
      align-items: start;
    }

    .workspace.with-inspector {
      grid-template-columns: 1fr 480px;
    }

    @media (max-width: 1100px) {
      .workspace.with-inspector {
        grid-template-columns: 1fr;
      }
    }

    /* Surface Card & Table */
    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .card-header {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      background: #FCFDFE;
    }

    .card-title {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .table-wrap {
      width: 100%;
      overflow-x: auto;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    th {
      padding: 10px 16px;
      font-size: 11px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--text-muted);
      background: var(--bg-subtle);
      border-bottom: 1px solid var(--border);
      user-select: none;
      white-space: nowrap;
    }

    td {
      padding: 12px 16px;
      border-bottom: 1px solid var(--border);
      font-size: 13px;
      color: var(--text-primary);
      vertical-align: middle;
    }

    tr:last-child td {
      border-bottom: none;
    }

    tbody tr.clickable-row {
      cursor: pointer;
      transition: background-color 0.1s ease;
    }

    tbody tr.clickable-row:hover {
      background-color: var(--bg-hover);
    }

    tbody tr.selected-row {
      background-color: var(--accent-soft);
    }

    .rate-pill {
      font-size: 11px;
      color: var(--text-muted);
      margin-left: 4px;
      font-weight: 400;
    }

    /* Inspector Panel */
    .inspector {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      position: sticky;
      top: 80px;
      max-height: calc(100vh - 104px);
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    .inspector-body {
      padding: 18px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .section-title {
      font-size: 11px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .code-block {
      background: var(--bg-subtle);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      padding: 12px;
      font-family: var(--font-mono);
      font-size: 12px;
      color: #1E293B;
      overflow-x: auto;
      white-space: pre-wrap;
      word-break: break-word;
      line-height: 1.55;
    }

    /* 5-Stage DLQ Breakdown Grid */
    .stage-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 6px;
    }

    .stage-box {
      border: 1px solid var(--border);
      background: var(--bg-canvas);
      border-radius: var(--radius-sm);
      padding: 8px 6px;
      text-align: center;
    }

    .stage-box.has-err {
      background: var(--rose-bg);
      border-color: var(--rose-border);
      color: var(--rose-text);
    }

    .stage-name {
      font-size: 10px;
      color: var(--text-muted);
      font-weight: 600;
      display: block;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .stage-box.has-err .stage-name {
      color: var(--rose-text);
    }

    .stage-count {
      font-size: 15px;
      font-weight: 700;
      margin-top: 2px;
    }

    /* DLQ Envelope List */
    .dlq-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .dlq-item {
      border: 1px solid var(--rose-border);
      background: #FFFBFB;
      border-radius: var(--radius-sm);
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .dlq-item-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 11px;
      color: var(--text-muted);
    }

    .dlq-error-msg {
      font-size: 12.5px;
      font-weight: 600;
      color: var(--rose-text);
      font-family: var(--font-mono);
    }

    /* Empty state */
    .empty-state {
      padding: 40px 20px;
      text-align: center;
      color: var(--text-muted);
    }

    /* Toast Notification */
    .toast-container {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 50;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .toast {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-left: 4px solid var(--accent);
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-md);
      font-size: 13px;
      color: var(--text-primary);
      min-width: 260px;
      animation: slideIn 0.2s ease-out;
    }
    .toast.toast-error { border-left-color: var(--rose-dot); }
    .toast.toast-success { border-left-color: var(--emerald-dot); }

    @keyframes slideIn {
      from { transform: translateY(10px); opacity: 0; }
      to { transform: translateY(0); opacity: 1; }
    }

    .two-col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    @media (max-width: 900px) {
      .two-col { grid-template-columns: 1fr; }
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
      margin-bottom: 14px;
    }
    .form-label {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-secondary);
    }
    textarea.text-input {
      font-family: var(--font-mono);
      font-size: 12px;
      min-height: 140px;
      resize: vertical;
    }

    /* ==========================================================================
       Native Visual Stream Studio Styles (design.md Dark & Industrial Theme)
       ========================================================================== */
    .studio-container {
      display: flex;
      flex-direction: column;
      height: calc(100vh - 160px);
      min-height: 720px;
      background: #080c16;
      border: 1px solid #1e293b;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
      position: relative;
    }

    .studio-topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 8px 16px;
      background: #0f172a;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      color: #f8fafc;
      z-index: 20;
    }

    .studio-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 13.5px;
    }

    .studio-brand .studio-tag {
      font-size: 10.5px;
      font-weight: 600;
      padding: 2px 7px;
      background: rgba(14, 165, 233, 0.15);
      color: #38bdf8;
      border: 1px solid rgba(56, 189, 248, 0.25);
      border-radius: 4px;
    }

    .studio-pipeline-select {
      background: #1e293b;
      color: #f8fafc;
      border: 1px solid #334155;
      padding: 4px 8px;
      border-radius: 6px;
      font-family: var(--font-mono);
      font-size: 12px;
      outline: none;
    }
    .studio-pipeline-select:focus {
      border-color: #f97316;
    }

    .studio-ai-bar {
      display: flex;
      align-items: center;
      gap: 8px;
      flex: 1;
      max-width: 580px;
      background: #141e2e;
      border: 1px solid #23344d;
      border-radius: 8px;
      padding: 4px 10px;
      transition: all 0.2s ease;
    }

    .studio-ai-bar:focus-within {
      border-color: #a855f7;
      box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.2);
    }

    .studio-ai-input {
      flex: 1;
      background: transparent;
      border: none;
      color: #f8fafc;
      font-size: 12px;
      outline: none;
    }

    .studio-ai-input::placeholder {
      color: #64748b;
    }

    .studio-btn-ai {
      background: linear-gradient(135deg, #7c3aed 0%, #a855f7 100%);
      color: #ffffff;
      border: none;
      font-size: 11px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 5px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 5px;
      transition: opacity 0.15s ease;
      white-space: nowrap;
    }

    .studio-btn-ai:hover {
      opacity: 0.9;
    }

    .studio-actions {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .studio-body {
      display: flex;
      flex: 1;
      position: relative;
      overflow: hidden;
    }

    /* Left Component Palette */
    .studio-palette {
      width: 250px;
      background: #0a0f1d;
      border-right: 1px solid rgba(255, 255, 255, 0.07);
      display: flex;
      flex-direction: column;
      user-select: none;
      z-index: 10;
    }

    .palette-search-wrap {
      padding: 10px 12px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .palette-search {
      width: 100%;
      background: #141e2e;
      border: 1px solid #23344d;
      border-radius: 6px;
      color: #f8fafc;
      font-size: 11.5px;
      padding: 6px 10px;
      outline: none;
      transition: border-color 0.15s ease;
    }

    .palette-search:focus {
      border-color: #38bdf8;
    }

    .palette-filter-chips {
      display: flex;
      gap: 4px;
    }

    .palette-chip {
      background: #141e2e;
      border: 1px solid #23344d;
      color: #94a3b8;
      border-radius: 4px;
      font-size: 10.5px;
      font-weight: 600;
      padding: 2px 7px;
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .palette-chip:hover {
      color: #f8fafc;
      border-color: #475569;
    }

    .palette-chip.active {
      background: #0284c7;
      color: #fff;
      border-color: #0284c7;
    }

    .palette-items-list {
      flex: 1;
      overflow-y: auto;
      padding: 10px;
    }

    .palette-items-list::-webkit-scrollbar,
    .studio-drawer::-webkit-scrollbar,
    .drawer-body::-webkit-scrollbar {
      width: 5px;
    }
    .palette-items-list::-webkit-scrollbar-thumb,
    .studio-drawer::-webkit-scrollbar-thumb,
    .drawer-body::-webkit-scrollbar-thumb {
      background: #334155;
      border-radius: 4px;
    }

    .palette-cat-header {
      font-size: 10px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: #64748b;
      margin: 12px 0 6px 4px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .palette-card {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 8px 10px;
      background: #111827;
      border: 1px solid rgba(255, 255, 255, 0.06);
      border-radius: 8px;
      margin-bottom: 6px;
      cursor: grab;
      transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
      color: #f8fafc;
    }

    .palette-card:hover {
      border-color: rgba(255, 255, 255, 0.18);
      background: #182234;
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
    }

    .palette-card-left {
      display: flex;
      align-items: center;
      gap: 9px;
      min-width: 0;
    }

    .palette-icon-badge {
      width: 26px;
      height: 26px;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .palette-card-info {
      display: flex;
      flex-direction: column;
      min-width: 0;
    }

    .palette-card-title {
      font-size: 11.5px;
      font-weight: 600;
      color: #f1f5f9;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .palette-card-desc {
      font-size: 9.5px;
      color: #94a3b8;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .palette-add-btn {
      background: transparent;
      border: none;
      color: #64748b;
      font-size: 14px;
      cursor: pointer;
      padding: 2px 4px;
      border-radius: 4px;
      transition: all 0.15s ease;
    }

    .palette-add-btn:hover {
      color: #fb923c;
      background: rgba(251, 146, 60, 0.1);
    }

    /* Center DAG Canvas */
    .studio-canvas-container {
      flex: 1;
      position: relative;
      overflow: hidden;
      background-color: #080c16;
      background-image: radial-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px);
      background-size: 20px 20px;
      cursor: grab;
    }

    .studio-canvas-container:active {
      cursor: grabbing;
    }

    .studio-svg-layer {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      transform-origin: 0 0;
    }

    .studio-wire {
      fill: none;
      stroke: #475569;
      stroke-width: 2.5;
      stroke-linecap: round;
      pointer-events: stroke;
      cursor: pointer;
      transition: stroke 0.15s ease, stroke-width 0.15s ease;
    }

    .studio-wire:hover {
      stroke: #f97316;
      stroke-width: 4;
      filter: drop-shadow(0 0 6px rgba(249, 115, 22, 0.6));
    }

    .studio-wire.selected {
      stroke: #38bdf8;
      stroke-width: 3.5;
      filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.6));
    }

    .studio-wire.active-stream {
      stroke: #f97316;
      stroke-width: 2.5;
      stroke-dasharray: 6 4;
      animation: wireStreamFlow 0.8s linear infinite;
      filter: drop-shadow(0 0 4px rgba(249, 115, 22, 0.4));
    }

    @keyframes wireStreamFlow {
      from { stroke-dashoffset: 20; }
      to { stroke-dashoffset: 0; }
    }

    .node-status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #475569;
      transition: all 0.2s ease;
      display: inline-block;
      flex-shrink: 0;
    }

    .node-status-dot.streaming {
      background: #10b981;
      box-shadow: 0 0 8px rgba(16, 185, 129, 0.9);
      animation: pulseStreaming 1.2s infinite;
    }

    @keyframes pulseStreaming {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.3); opacity: 0.7; }
    }

    .node-tap-indicator {
      display: inline-flex;
      align-items: center;
      gap: 3px;
      font-size: 9px;
      font-weight: 800;
      letter-spacing: 0.05em;
      padding: 1px 6px;
      border-radius: 9999px;
      background: #ea580c;
      color: #ffffff;
      box-shadow: 0 0 8px rgba(234, 88, 12, 0.7);
      animation: pulseTap 1.2s ease-in-out infinite;
    }

    @keyframes pulseTap {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.75; transform: scale(0.95); }
    }

    .studio-nodes-layer {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      transform-origin: 0 0;
    }

    /* Node Card on Canvas (n8n & Node-RED Inspired) */
    .studio-node {
      position: absolute;
      width: 240px;
      background: linear-gradient(145deg, #131c2e, #0c1220);
      border: 1px solid rgba(255, 255, 255, 0.09);
      border-radius: 10px;
      box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.04);
      color: #f8fafc;
      cursor: move;
      pointer-events: auto;
      user-select: none;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
      font-size: 12px;
    }

    .studio-node:hover {
      border-color: rgba(255, 255, 255, 0.22);
      box-shadow: 0 12px 30px -4px rgba(0, 0, 0, 0.7);
    }

    .studio-node.selected {
      border-color: #ea580c;
      box-shadow: 0 0 0 2px rgba(234, 88, 12, 0.45), 0 12px 32px -4px rgba(0, 0, 0, 0.8);
    }

    .node-accent-bar {
      height: 3.5px;
      width: 100%;
      border-top-left-radius: 9px;
      border-top-right-radius: 9px;
    }

    .studio-node-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 9px 12px 6px;
    }

    .node-header-left {
      display: flex;
      align-items: center;
      gap: 9px;
      min-width: 0;
    }

    .node-icon-box {
      width: 28px;
      height: 28px;
      border-radius: 7px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .node-title-group {
      display: flex;
      flex-direction: column;
      min-width: 0;
    }

    .node-title {
      font-weight: 600;
      font-size: 12.5px;
      color: #f1f5f9;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .node-subtitle {
      font-family: var(--font-mono);
      font-size: 10px;
      color: #94a3b8;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .status-pulse-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 6px rgba(16, 185, 129, 0.8);
      display: inline-block;
    }

    .studio-node-body {
      padding: 4px 12px 8px;
    }

    .node-summary-chip {
      background: rgba(0, 0, 0, 0.35);
      border: 1px solid rgba(255, 255, 255, 0.06);
      border-radius: 5px;
      padding: 3px 8px;
      font-family: var(--font-mono);
      font-size: 10.5px;
      color: #cbd5e1;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .node-summary-chip .chip-key {
      color: #64748b;
      margin-right: 4px;
    }

    .node-summary-chip .chip-val {
      color: #38bdf8;
    }

    .studio-node-footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 4px 12px 8px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 10px;
      color: #94a3b8;
    }

    /* Embedded Port Handles */
    .port-handle {
      position: absolute;
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: #090d16;
      border: 2.5px solid #64748b;
      cursor: crosshair;
      transition: all 0.15s ease;
      z-index: 5;
    }

    .port-handle:hover {
      transform: scale(1.35);
      box-shadow: 0 0 8px currentColor;
    }

    .port-handle.input-port {
      left: -7px;
      border-color: #38bdf8;
      color: #38bdf8;
    }

    .port-handle.output-port {
      right: -7px;
      border-color: #f97316;
      color: #f97316;
    }

    .port-handle.connected {
      border-color: #10b981;
      color: #10b981;
      background: #064e3b;
    }

    /* Switch multi-port output rows */
    .node-ports-container {
      padding: 4px 12px 8px;
      display: flex;
      flex-direction: column;
      gap: 5px;
    }

    .node-port-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      position: relative;
      font-size: 10px;
      font-family: var(--font-mono);
      color: #cbd5e1;
      background: rgba(0,0,0,0.25);
      padding: 3px 8px;
      border-radius: 4px;
      border: 1px solid rgba(255,255,255,0.04);
    }

    .node-port-row .port-handle {
      right: -14px;
      top: 50%;
      transform: translateY(-50%);
    }

    /* Canvas Controls Floating Island */
    .canvas-controls {
      position: absolute;
      bottom: 16px;
      left: 16px;
      display: flex;
      align-items: center;
      gap: 4px;
      background: #0f172a;
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 8px;
      padding: 4px 8px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
      z-index: 10;
    }

    .canvas-ctl-btn {
      background: transparent;
      border: none;
      color: #94a3b8;
      font-size: 13px;
      padding: 4px 8px;
      border-radius: 4px;
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .canvas-ctl-btn:hover {
      background: #1e293b;
      color: #f8fafc;
    }

    /* Right Property & Wire-Tap Drawer */
    .studio-drawer {
      width: 400px;
      background: #0b1120;
      border-left: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      flex-direction: column;
      z-index: 10;
      color: #f8fafc;
    }

    .drawer-tabs {
      display: flex;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      background: #0f172a;
    }

    .drawer-tab {
      flex: 1;
      padding: 11px;
      text-align: center;
      font-size: 12px;
      font-weight: 600;
      color: #94a3b8;
      background: transparent;
      border: none;
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .drawer-tab.active {
      color: #f97316;
      border-bottom: 2px solid #ea580c;
      background: #131c2e;
    }

    .drawer-body {
      flex: 1;
      overflow-y: auto;
      padding: 16px;
    }

    .drawer-pane {
      display: none;
    }

    .drawer-pane.active {
      display: block;
    }

    .studio-code-input {
      width: 100%;
      background: #060911;
      border: 1px solid #1e293b;
      border-radius: 6px;
      padding: 10px 12px;
      color: #38bdf8;
      font-family: var(--font-mono);
      font-size: 12px;
      line-height: 1.5;
      outline: none;
      resize: vertical;
      transition: border-color 0.15s ease;
    }

    .studio-code-input:focus {
      border-color: #38bdf8;
      box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
    }

    .sql-snippet-chip {
      background: #1e293b;
      border: 1px solid #334155;
      color: #cbd5e1;
      font-size: 10.5px;
      font-family: var(--font-mono);
      padding: 3px 8px;
      border-radius: 4px;
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .sql-snippet-chip:hover {
      background: #273549;
      color: #f8fafc;
      border-color: #38bdf8;
    }

    .terminal-window {
      background: #060911;
      border: 1px solid #1e293b;
      border-radius: 6px;
      padding: 10px;
      font-family: var(--font-mono);
      font-size: 11px;
      color: #38bdf8;
      max-height: 220px;
      overflow-y: auto;
      white-space: pre-wrap;
      word-break: break-all;
    }

    .json-sync-textarea {
      width: 100%;
      height: 380px;
      background: #060911;
      border: 1px solid #1e293b;
      border-radius: 6px;
      padding: 12px;
      color: #f8fafc;
      font-family: var(--font-mono);
      font-size: 11.5px;
      line-height: 1.45;
      resize: vertical;
      outline: none;
    }

    .json-sync-textarea:focus {
      border-color: #ea580c;
    }

    /* Fleet Control Plane Pipeline & Dialogs */
    .pipeline-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      position: relative;
    }

    .pipeline-step {
      display: flex;
      align-items: center;
      gap: 12px;
      z-index: 2;
    }

    .pipeline-node {
      width: 34px;
      height: 34px;
      border-radius: 50%;
      background: var(--bg-surface);
      border: 2px solid var(--border-strong);
      color: var(--text-muted);
      font-weight: 700;
      font-size: 13px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      box-shadow: var(--shadow-xs);
    }

    .pipeline-node.active {
      border-color: var(--accent);
      background: var(--accent-soft);
      color: var(--accent);
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
    }

    .pipeline-node.success {
      border-color: var(--emerald-dot);
      background: var(--emerald-bg);
      color: var(--emerald-text);
    }

    .pipeline-node.failed {
      border-color: var(--rose-dot);
      background: var(--rose-bg);
      color: var(--rose-text);
    }

    .pipeline-title {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-primary);
    }

    .pipeline-sub {
      font-size: 11px;
      color: var(--text-muted);
    }

    .pipeline-connector {
      flex: 1;
      height: 2px;
      background: var(--border-strong);
      margin: 0 16px;
      position: relative;
    }

    .fleet-modal-backdrop,
    .fleet-modal-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background: rgba(15, 23, 42, 0.45);
      backdrop-filter: blur(4px);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    .fleet-modal-dialog {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      width: 100%;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      animation: modalFadeIn 0.15s ease-out;
    }

    @keyframes modalFadeIn {
      from { opacity: 0; transform: scale(0.97); }
      to { opacity: 1; transform: scale(1); }
    }

    .fleet-modal-header {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #FCFDFE;
    }

    .fleet-modal-body {
      padding: 20px;
      overflow-y: auto;
    }

    .fleet-modal-footer {
      padding: 14px 20px;
      border-top: 1px solid var(--border);
      background: var(--bg-canvas);
      display: flex;
      justify-content: flex-end;
      gap: 10px;
    }

    /* ==========================================================================
       Guided Rule Designer & Stream Visual Schema Builder Styles
       ========================================================================== */
    .designer-stepper {
      display: flex;
      align-items: center;
      background: var(--bg-subtle);
      border-bottom: 1px solid var(--border);
      padding: 0 16px;
    }

    .designer-step-tab {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 12px 18px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      border-bottom: 2px solid transparent;
      cursor: pointer;
      transition: all 0.15s ease;
      background: none;
      border-top: none;
      border-left: none;
      border-right: none;
    }

    .designer-step-tab:hover {
      color: var(--text-primary);
    }

    .designer-step-tab.active {
      color: var(--accent);
      border-bottom-color: var(--accent);
      background: var(--bg-surface);
    }

    .designer-step-tab.completed {
      color: var(--emerald-text);
    }

    .step-number {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--border);
      color: var(--text-muted);
      font-size: 11px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .designer-step-tab.active .step-number {
      background: var(--accent);
      color: #fff;
    }

    .designer-step-tab.completed .step-number {
      background: var(--emerald-dot);
      color: #fff;
    }

    .designer-split {
      display: grid;
      grid-template-columns: 1.25fr 0.95fr;
      gap: 20px;
      height: 600px;
    }

    @media (max-width: 1024px) {
      .designer-split {
        grid-template-columns: 1fr;
        height: auto;
      }
    }

    .designer-form-col {
      overflow-y: auto;
      padding-right: 12px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .designer-preview-col {
      background: #090e17;
      border: 1px solid #1e293b;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      overflow: hidden;
      box-shadow: 0 4px 16px rgba(0,0,0,0.4);
    }

    .designer-preview-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 14px;
      background: #0f172a;
      border-bottom: 1px solid #1e293b;
      color: #cbd5e1;
      font-size: 12px;
    }

    .designer-preview-body {
      flex: 1;
      overflow-y: auto;
      padding: 12px 14px;
      font-family: var(--font-mono);
      font-size: 12px;
      line-height: 1.5;
      color: #38bdf8;
      white-space: pre-wrap;
      word-break: break-all;
    }

    .designer-preview-footer {
      padding: 10px 14px;
      background: #0d1424;
      border-top: 1px solid #1e293b;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .sink-item-card {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      padding: 14px;
      box-shadow: var(--shadow-xs);
      display: flex;
      flex-direction: column;
      gap: 10px;
      position: relative;
    }

    .sink-item-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .fields-grid-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 12px;
    }

    .fields-grid-table th {
      background: var(--bg-subtle);
      padding: 8px 10px;
      border: 1px solid var(--border);
      text-align: left;
      font-weight: 600;
      color: var(--text-secondary);
    }

    /* ==========================================================================
       Phase 2: Metadata Property Forms & Connection Pool Hub Styles
       ========================================================================== */
    .prop-form-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 14px;
    }

    .prop-form-group {
      display: flex;
      flex-direction: column;
      gap: 5px;
    }

    .prop-form-group.full-width {
      grid-column: 1 / -1;
    }

    .prop-label-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 6px;
    }

    .prop-label {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .prop-hint {
      font-size: 11px;
      color: var(--text-muted);
      line-height: 1.3;
    }

    .prop-password-wrap {
      position: relative;
      display: flex;
      align-items: center;
    }

    .prop-password-wrap input {
      padding-right: 36px;
      width: 100%;
    }

    .prop-eye-btn {
      position: absolute;
      right: 6px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px 6px;
      font-size: 14px;
      color: var(--text-muted);
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: color 0.15s;
    }

    .prop-eye-btn:hover {
      color: var(--text-primary);
      background: var(--bg-surface-hover);
    }

    .prop-switch-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 4px 0;
    }

    .prop-switch {
      position: relative;
      display: inline-block;
      width: 36px;
      height: 20px;
    }

    .prop-switch input {
      opacity: 0;
      width: 0;
      height: 0;
    }

    .prop-switch-slider {
      position: absolute;
      cursor: pointer;
      top: 0; left: 0; right: 0; bottom: 0;
      background-color: var(--border);
      transition: .2s;
      border-radius: 20px;
    }

    .prop-switch-slider:before {
      position: absolute;
      content: "";
      height: 14px;
      width: 14px;
      left: 3px;
      bottom: 3px;
      background-color: white;
      transition: .2s;
      border-radius: 50%;
    }

    .prop-switch input:checked + .prop-switch-slider {
      background-color: var(--accent);
    }

    .prop-switch input:checked + .prop-switch-slider:before {
      transform: translateX(16px);
    }

    .prop-dual-toggle-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 8px 12px;
      background: var(--bg-subtle);
      border-radius: 6px;
      border: 1px solid var(--border);
      margin-bottom: 12px;
    }

    .confkeys-master-detail {
      display: flex;
      gap: 16px;
      height: 520px;
    }

    .confkeys-sidebar {
      width: 250px;
      flex-shrink: 0;
      display: flex;
      flex-direction: column;
      gap: 10px;
      border-right: 1px solid var(--border);
      padding-right: 14px;
    }

    .confkeys-list {
      flex: 1;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .confkey-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 8px 12px;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: var(--bg-surface);
      cursor: pointer;
      font-size: 12px;
      transition: all 0.15s ease;
    }

    .confkey-item:hover {
      background: var(--bg-surface-hover);
      border-color: var(--accent);
    }

    .confkey-item.active {
      background: #eff6ff;
      border-color: var(--accent);
      color: var(--accent);
      font-weight: 600;
    }

    .preflight-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 11px;
      font-weight: 600;
    }

    .preflight-pill.success {
      background: #ecfdf5;
      color: #065f46;
      border: 1px solid #a7f3d0;
    }

    .preflight-pill.error {
      background: #fef2f2;
      color: #991b1b;
      border: 1px solid #fecaca;
    }

    .preflight-pill.running {
      background: #eff6ff;
      color: #1e40af;
      border: 1px solid #bfdbfe;
    }

    .conn-ref-badge {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 2px 8px;
      border-radius: 12px;
      font-size: 11px;
      font-weight: 600;
      cursor: help;
    }

    /* --- Phase 4: Extensions, UDFs & Services Center --- */
    .ext-subtabs-bar {
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 6px 8px;
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: 8px;
      margin-bottom: 16px;
      flex-wrap: wrap;
    }
    .ext-subtab-btn {
      padding: 6px 14px;
      border-radius: 6px;
      border: 1px solid transparent;
      background: transparent;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-secondary);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.15s ease;
    }
    .ext-subtab-btn:hover {
      background: var(--bg-surface-hover);
      color: var(--text-primary);
    }
    .ext-subtab-btn.active {
      background: var(--accent);
      color: #ffffff;
      border-color: var(--accent);
    }
    .func-card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 10px;
      max-height: 520px;
      overflow-y: auto;
      padding: 2px;
    }
    .func-card {
      background: var(--bg-surface);
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 6px;
      transition: all 0.15s ease;
    }
    .func-card:hover {
      border-color: var(--accent);
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
    }
    .func-card-sig {
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 700;
      color: #8b5cf6;
      word-break: break-all;
    }
    .dropzone-box {
      border: 2px dashed var(--border);
      border-radius: 8px;
      padding: 24px;
      text-align: center;
      background: var(--bg-subtle);
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .dropzone-box:hover, .dropzone-box.dragover {
      border-color: var(--accent);
      background: #eff6ff;
    }
    .doc-pill-link {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 11px;
      font-weight: 500;
      color: var(--accent);
      text-decoration: none;
      padding: 2px 7px;
      border-radius: 4px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      transition: all 0.15s ease;
      cursor: pointer;
    }
    .doc-pill-link:hover {
      background: #dbeafe;
      color: #1e40af;
      border-color: #93c5fd;
    }
    .field-pill {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 11px;
      font-family: var(--font-mono);
      color: #1e293b;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 4px;
      padding: 2px 8px;
      cursor: pointer;
      transition: all 0.15s ease;
      user-select: none;
    }
    .field-pill:hover {
      background: #e2e8f0;
      border-color: #94a3b8;
      color: var(--accent);
    }
    .recipe-btn {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 4px 9px;
      font-size: 11px;
      font-weight: 600;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: var(--bg-surface);
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.15s ease;
    }
    .recipe-btn:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: #eff6ff;
    }
  </style>
</head>
<body>

  <!-- Top Navigation -->
  <header class="topbar">
    <div class="brand">
      <div class="brand-logo">rk</div>
      <div class="brand-title">
        rekuiper
        <span class="brand-subtitle">Edge SQL &amp; IIoT Telemetry Engine</span>
      </div>
    </div>

    <div class="topbar-controls">
      <span id="conn-badge" class="badge badge-emerald">
        <span class="badge-dot"></span>
        <span id="conn-text">Connected</span>
      </span>

      <span id="mode-badge" class="badge badge-slate" title="Runtime Configuration Mode">
        Mutable Mode
      </span>

      <button id="reload-manifest-btn" class="btn btn-sm" style="display: none;" onclick="reloadDeclarativeManifest()">
        &#x21bb; Reload Manifest
      </button>

      <!-- Direct Docs & Help/FAQ Links -->
      <button class="btn btn-sm" onclick="openDoc('guide/ui/web_console_user_guide')" title="Open Interactive User Guide &amp; Docs" style="display:inline-flex; align-items:center; gap:5px; background:var(--bg-surface); font-weight: 500;">
        <span>📖</span> User Guide
      </button>

      <button class="btn btn-sm" onclick="openDoc('faq')" title="Open rekuiper FAQ &amp; Troubleshooting Guide" style="display:inline-flex; align-items:center; gap:5px; background:var(--bg-surface); font-weight: 500;">
        <span>❓</span> Help &amp; FAQ
      </button>

      <!-- Security / Auth Lock Control -->
      <button id="topbar-auth-btn" class="btn btn-sm" onclick="handleTopbarAuthClick()" title="Console Security &amp; Access Control" style="display:inline-flex; align-items:center; gap:5px; font-size:11px;">
        <span id="topbar-auth-icon">🔓</span>
        <span id="topbar-auth-label">Public Access</span>
      </button>

      <select id="poll-interval" class="select-input" onchange="updatePollInterval(this.value)" aria-label="Refresh interval">
        <option value="1000">Poll: 1s</option>
        <option value="2000" selected>Poll: 2s</option>
        <option value="5000">Poll: 5s</option>
        <option value="0">Paused</option>
      </select>

      <button class="btn btn-sm" onclick="refreshAll(true)">Refresh Now</button>
    </div>
  </header>

  <!-- Main Content -->
  <main class="container">

    <!-- Zero-Knowledge Guided Pipeline Quick Start Assistant -->
    <section id="quickstart-banner" style="background: linear-gradient(135deg, #f0fdf4 0%, #e0f2fe 100%); border: 1px solid #bbf7d0; border-radius: 8px; padding: 14px 18px; margin-bottom: 16px; box-shadow: 0 2px 6px rgba(0,0,0,0.03);">
      <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px;">
        <div style="display: flex; align-items: center; gap: 8px;">
          <span style="font-size: 18px;">🚀</span>
          <div>
            <strong style="font-size: 13px; color: #166534;">Zero-Knowledge Guided Pipeline Assistant</strong>
            <span style="font-size: 11px; color: #15803d; margin-left: 6px;">Launch a production stream processing pipeline in 3 simple clicks</span>
          </div>
        </div>
        <div style="display: flex; align-items: center; gap: 8px;">
          <a href="javascript:void(0)" onclick="openDoc('guide/ui/web_console_user_guide#journey-1-1-click-guided-quick-start-pipeline')" style="font-size: 11px; color: #0369a1; text-decoration: none; font-weight: 600;">📖 Walkthrough</a>
          <button type="button" class="btn btn-sm" onclick="dismissQuickStartBanner()" style="padding: 2px 8px; font-size: 11px; background: rgba(255,255,255,0.7); border-color: #cbd5e1;">✕ Hide</button>
        </div>
      </div>

      <div style="display: grid; grid-template-columns: 1fr 1fr 1fr auto; gap: 12px; align-items: flex-end;">
        <div>
          <label style="display: block; font-size: 11px; font-weight: 600; color: #166534; margin-bottom: 4px;">1. Ingress Source</label>
          <select id="qs-source" class="select-input" style="width: 100%; font-size: 12px; background: #ffffff;">
            <option value="simulator">Synthetic Industrial Sensor (Built-in)</option>
            <option value="mqtt">MQTT Broker (factory/+/telemetry)</option>
            <option value="modbus">Modbus TCP PLC (Port 502)</option>
            <option value="opcua">OPC-UA Server (Port 4840)</option>
            <option value="httppull">HTTP Pull REST API</option>
          </select>
        </div>

        <div>
          <label style="display: block; font-size: 11px; font-weight: 600; color: #166534; margin-bottom: 4px;">2. Analytics Goal</label>
          <select id="qs-goal" class="select-input" style="width: 100%; font-size: 12px; background: #ffffff;">
            <option value="overheat">Overheat Threshold Alert (&gt; 80°C)</option>
            <option value="moving_avg">10-Second Moving Average (Tumbling)</option>
            <option value="vibration_anomaly">Vibration Anomaly Spike Detector</option>
            <option value="passthrough">Raw Ingestion &amp; Passthrough</option>
          </select>
        </div>

        <div>
          <label style="display: block; font-size: 11px; font-weight: 600; color: #166534; margin-bottom: 4px;">3. Egress Destination</label>
          <select id="qs-sink" class="select-input" style="width: 100%; font-size: 12px; background: #ffffff;">
            <option value="log">Local Edge Log (kuiper.out)</option>
            <option value="mqtt">Cloud MQTT Broker (alerts/plant1)</option>
            <option value="rest">REST Incident Webhook</option>
          </select>
        </div>

        <button type="button" class="btn btn-primary" onclick="launchGuidedQuickStartPipeline()" style="white-space: nowrap; font-weight: 600; background: #16a34a; border-color: #15803d; height: 32px; display: inline-flex; align-items: center; gap: 6px;">
          <span>⚡ Launch Pipeline</span>
        </button>
      </div>
    </section>

    <!-- KPI Strip -->
    <section class="kpi-grid">
      <div class="kpi-card">
        <div class="kpi-label">
          <span>ACTIVE RULES</span>
          <span class="badge badge-emerald" id="kpi-rules-pct">100%</span>
        </div>
        <div class="kpi-value tabular" id="kpi-rules-count">0 / 0</div>
        <div class="kpi-sub">
          <span id="kpi-rules-stopped">0 stopped</span>
          <span id="kpi-uptime" class="tabular"></span>
        </div>
      </div>

      <div class="kpi-card">
        <div class="kpi-label">
          <span>INGRESS THROUGHPUT</span>
          <span style="color: var(--accent); font-weight: 600;">IN</span>
        </div>
        <div class="kpi-value tabular" id="kpi-in-rate">0 <span style="font-size: 13px; font-weight: 500; color: var(--text-muted);">rec/s</span></div>
        <div class="kpi-sub tabular">
          <span>Total In:</span>
          <strong id="kpi-in-total">0</strong>
        </div>
      </div>

      <div class="kpi-card">
        <div class="kpi-label">
          <span>EGRESS THROUGHPUT</span>
          <span style="color: var(--emerald-text); font-weight: 600;">OUT</span>
        </div>
        <div class="kpi-value tabular" id="kpi-out-rate">0 <span style="font-size: 13px; font-weight: 500; color: var(--text-muted);">rec/s</span></div>
        <div class="kpi-sub tabular">
          <span>Total Out:</span>
          <strong id="kpi-out-total">0</strong>
        </div>
      </div>

      <div class="kpi-card">
        <div class="kpi-label">
          <span>TOPOLOGY CATALOG</span>
        </div>
        <div class="kpi-value tabular" id="kpi-catalog-count">0</div>
        <div class="kpi-sub tabular">
          <span id="kpi-streams-sub">0 Streams</span> &middot;
          <span id="kpi-tables-sub">0 Tables</span>
        </div>
      </div>

      <div class="kpi-card">
        <div class="kpi-label">
          <span>SINK RETRY CACHE</span>
        </div>
        <div class="kpi-value tabular" id="kpi-cache-depth">0</div>
        <div class="kpi-sub tabular">
          <span>Filtered: <strong id="kpi-filtered-total">0</strong></span>
        </div>
      </div>

      <div class="kpi-card" id="kpi-dlq-card">
        <div class="kpi-label">
          <span>DLQ &amp; POISON PILLS</span>
          <span class="badge badge-slate" id="kpi-dlq-badge">Clean</span>
        </div>
        <div class="kpi-value tabular" id="kpi-dlq-total">0</div>
        <div class="kpi-sub tabular">
          <span>Exceptions: <strong id="kpi-exc-total">0</strong></span>
        </div>
      </div>
    </section>

    <!-- Navigation & Filter Bar -->
    <section class="nav-bar">
      <div class="tabs">
        <button class="tab-btn active" id="tab-btn-rules" onclick="switchTab('rules')">
          Pipelines &amp; Rules
        </button>
        <button class="tab-btn" id="tab-btn-catalog" onclick="switchTab('catalog')">
          Streams, Schemas &amp; Connections
        </button>
        <button class="tab-btn" id="tab-btn-plugins" onclick="switchTab('plugins')">
          <span style="display:inline-flex; align-items:center; gap:6px;">
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 20V10"></path><path d="M12 20V4"></path><path d="M6 20v-6"></path></svg>
            Extensions &amp; Services
          </span>
        </button>
        <button class="tab-btn" id="tab-btn-ingest" onclick="switchTab('ingest')">
          OTLP &amp; Data Test Console
        </button>
        <button class="tab-btn" id="tab-btn-metrics" onclick="switchTab('metrics')">
          Prometheus /metrics
        </button>
        <button class="tab-btn" id="tab-btn-studio" onclick="switchTab('studio')">
          <span style="color:#ea580c; font-weight:700;">✨ Visual Stream Studio</span>
        </button>
        <button class="tab-btn" id="tab-btn-fleet" onclick="switchTab('fleet')">
          <span style="display:inline-flex; align-items:center; gap:6px;">
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="2" width="20" height="8" rx="2" ry="2"></rect><rect x="2" y="14" width="20" height="8" rx="2" ry="2"></rect><line x1="6" y1="6" x2="6.01" y2="6"></line><line x1="6" y1="18" x2="6.01" y2="18"></line></svg>
            Fleet Manager
          </span>
        </button>
      </div>

      <div class="filter-group" id="rules-filter-bar">
        <input

          type="search"

          id="rule-search"

          class="text-input"

          placeholder="Filter rules by ID or status..."

          oninput="renderRulesTable()"
          style="width: 240px;"
        />
        <select id="rule-status-filter" class="select-input" onchange="renderRulesTable()">
          <option value="all">All Statuses</option>
          <option value="running">Running Only</option>
          <option value="stopped">Stopped / Halted</option>
          <option value="dlq">Has DLQ / Errors (&gt; 0)</option>
        </select>
      </div>
    </section>

    <!-- TAB 1: Pipelines & Rules + Slide-Over Inspector -->
    <section id="view-rules" class="workspace">
      <div class="card">
        <div class="card-header" style="display: flex; justify-content: space-between; align-items: center;">
          <div>
            <div class="card-title">
              Rule Execution Pipelines
              <span class="badge badge-slate tabular" id="table-rule-count">0</span>
            </div>
            <div style="font-size: 12px; color: var(--text-muted);">
              Click any rule to inspect SQL, stage counters &amp; Dead-Letter Queue poison pills
            </div>
          </div>
          <div>
            <button class="btn btn-sm btn-primary" onclick="openNewRuleDesigner()" style="display: inline-flex; align-items: center; gap: 6px; font-weight: 600;">
              <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="12" y1="5" x2="12" y2="19"></line><line x1="5" y1="12" x2="19" y2="12"></line></svg>
              + New Rule Pipeline
            </button>
          </div>
        </div>

        <div class="table-wrap">
          <table>
            <thead>
              <tr>
                <th>Rule ID</th>
                <th>Status</th>
                <th>Records In</th>
                <th>Records Out</th>
                <th>Filtered</th>
                <th>Sink Cache</th>
                <th>DLQ / Errors</th>
                <th style="text-align: right;">Actions</th>
              </tr>
            </thead>
            <tbody id="rules-tbody">
              <tr>
                <td colspan="8" class="empty-state">Loading active rules...</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>

      <!-- Inspector Drawer -->
      <aside id="rule-inspector" class="inspector" style="display: none;">
        <div class="card-header">
          <div class="card-title">
            <span id="insp-rule-id" style="font-family: var(--font-mono);">rule_id</span>
            <span id="insp-status-badge" class="badge badge-emerald">Running</span>
          </div>
          <div style="display: flex; gap: 6px;">
            <button class="btn btn-sm" onclick="loadRuleIntoStudio(state.selectedRuleId)" style="background:#1e293b; color:#fb923c; border-color:#ea580c; font-weight:600;" title="Open in Visual Studio">Studio 🎨</button>
            <button class="btn btn-sm" onclick="closeInspector()" title="Close Inspector">&#x2715;</button>
          </div>
        </div>

        <div class="inspector-body">
          <!-- Rule SQL -->
          <div>
            <div class="section-title">
              <span>Pipeline SQL Definition</span>
              <span id="insp-options-summary" style="font-family: var(--font-mono); text-transform: none;"></span>
            </div>
            <pre class="code-block" id="insp-sql">SELECT * FROM stream</pre>
          </div>

          <!-- 5-Stage DLQ Breakdown -->
          <div>
            <div class="section-title">
              <span>DLQ Poison-Pill Stage Breakdown</span>
              <button class="btn btn-danger btn-sm" id="clear-dlq-btn" onclick="clearSelectedRuleDlq()">
                Clear DLQ Buffer
              </button>
            </div>
            <div class="stage-grid">
              <div class="stage-box" id="st-codec">
                <span class="stage-name" title="CodecDecode">Codec</span>
                <div class="stage-count tabular" id="st-codec-val">0</div>
              </div>
              <div class="stage-box" id="st-schema">
                <span class="stage-name" title="SchemaValidation">Schema</span>
                <div class="stage-count tabular" id="st-schema-val">0</div>
              </div>
              <div class="stage-box" id="st-sql">
                <span class="stage-name" title="SqlEval">SQL Eval</span>
                <div class="stage-count tabular" id="st-sql-val">0</div>
              </div>
              <div class="stage-box" id="st-tpl">
                <span class="stage-name" title="DataTemplate">Template</span>
                <div class="stage-count tabular" id="st-tpl-val">0</div>
              </div>
              <div class="stage-box" id="st-sink">
                <span class="stage-name" title="SinkDelivery">Sink 4xx</span>
                <div class="stage-count tabular" id="st-sink-val">0</div>
              </div>
            </div>
          </div>

          <!-- Recent DLQ Envelopes -->
          <div>
            <div class="section-title">
              <span>Recent DLQ Envelopes (In-Memory Ring Buffer)</span>
              <span class="tabular" id="insp-dlq-count-label">0 entries</span>
            </div>
            <div id="insp-dlq-list" class="dlq-list">
              <div class="empty-state" style="padding: 18px; background: var(--bg-canvas); border-radius: 6px; border: 1px dashed var(--border);">
                Zero poison pills recorded for this rule.
              </div>
            </div>
          </div>

          <!-- Sinks & Options JSON -->
          <div>
            <div class="section-title">
              <span>Configured Sink Actions &amp; Options</span>
            </div>
            <pre class="code-block" id="insp-actions-json">[]</pre>
          </div>
        </div>
      </aside>
    </section>

    <!-- TAB 2: Streams, Tables & Connections -->
    <section id="view-catalog" style="display: none;" class="two-col">
      <div style="display: flex; flex-direction: column; gap: 20px;">
        <div class="card">
          <div class="card-header" style="display: flex; justify-content: space-between; align-items: center;">
            <div class="card-title">
              Declared Streams
              <span class="badge badge-slate tabular" id="catalog-streams-count">0</span>
            </div>
            <div>
              <button id="catalog-new-stream-btn" class="btn btn-sm btn-primary" onclick="openNewStreamDesigner('stream')" style="display: inline-flex; align-items: center; gap: 4px; font-weight: 600;">
                + New Stream
              </button>
            </div>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th>Stream Name</th>
                  <th>Details / Schema</th>
                  <th style="text-align: right; width: 130px;">Actions</th>
                </tr>
              </thead>
              <tbody id="streams-tbody">
                <tr><td colspan="3" class="empty-state">No streams defined.</td></tr>
              </tbody>
            </table>
          </div>
        </div>

        <!-- Schema Registry & Serialization Hub Card -->
        <div class="card" id="schemas-hub-card">
          <div class="card-header" style="display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
            <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
              <span>Schema Registry &amp; Serialization Hub</span>
              <span class="badge badge-slate tabular" id="catalog-schemas-count">0</span>
            </div>
            <div style="display: flex; align-items: center; gap: 8px;">
              <input type="text" id="catalog-schemas-search" class="text-input" style="padding: 4px 10px; font-size: 12px; width: 150px;" placeholder="Search schemas..." oninput="renderSchemasTable()" />
              <select id="catalog-schemas-filter" class="select-input" style="padding: 4px 8px; font-size: 12px;" onchange="renderSchemasTable()">
                <option value="all">All Formats</option>
                <option value="protobuf">Protobuf 3 (.proto)</option>
                <option value="custom">Custom Codecs</option>
                <option value="json">JSON Schema</option>
                <option value="delimited">Delimited / CSV</option>
              </select>
              <button class="btn btn-sm btn-primary" onclick="openNewSchemaModal()" title="Register New Schema Definition">
                + New Schema 📜
              </button>
            </div>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th style="width: 25%;">Schema ID</th>
                  <th style="width: 18%;">Format / Protocol</th>
                  <th style="width: 27%;">Contract Symbols / Messages</th>
                  <th style="width: 16%;">Active References</th>
                  <th style="width: 14%; text-align: right;">Actions</th>
                </tr>
              </thead>
              <tbody id="schemas-tbody">
                <tr><td colspan="5" class="empty-state">Loading schemas...</td></tr>
              </tbody>
            </table>
          </div>
        </div>
      </div>

      <div style="display: flex; flex-direction: column; gap: 20px;">
        <div class="card">
          <div class="card-header" style="display: flex; justify-content: space-between; align-items: center;">
            <div class="card-title">
              Lookup &amp; Scan Tables (Modbus / OPC-UA / SQL / File)
              <span class="badge badge-slate tabular" id="catalog-tables-count">0</span>
            </div>
            <div>
              <button class="btn btn-sm btn-primary" onclick="openNewStreamDesigner('table')" style="display: inline-flex; align-items: center; gap: 4px; font-weight: 600;">
                + New Table
              </button>
            </div>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th>Table Name</th>
                  <th>Details</th>
                  <th style="text-align: right; width: 130px;">Actions</th>
                </tr>
              </thead>
              <tbody id="tables-tbody">
                <tr><td colspan="3" class="empty-state">No tables defined.</td></tr>
              </tbody>
            </table>
          </div>
        </div>

        <div class="card">
          <div class="card-header" style="display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
            <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
              <span>Shared Connection Pool Hub</span>
              <span class="badge badge-slate tabular" id="catalog-conns-count">0</span>
            </div>
            <div style="display: flex; align-items: center; gap: 8px;">
              <input type="text" id="catalog-conns-search" class="text-input" style="padding: 4px 10px; font-size: 12px; width: 170px;" placeholder="Search connections..." oninput="renderConnectionsTable()" />
              <button class="btn btn-sm" onclick="openConfKeysManagerModal()" title="Manage Connector Configuration Keys">
                Manage ConfKeys 🔑
              </button>
              <button class="btn btn-sm btn-primary" onclick="openNewConnectionModal()" title="Add New Shared Connection">
                + New Connection 🔌
              </button>
            </div>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th style="width: 22%;">Connection ID</th>
                  <th style="width: 20%;">Type &amp; Target</th>
                  <th style="width: 22%;">Active Pipeline References</th>
                  <th style="width: 22%;">Configuration Preview</th>
                  <th style="width: 14%; text-align: right;">Actions</th>
                </tr>
              </thead>
              <tbody id="conns-tbody">
                <tr><td colspan="5" class="empty-state">No shared connections configured.</td></tr>
              </tbody>
            </table>
          </div>
        </div>
      </div>
    </section>

    <!-- TAB 3: Extensions, UDFs & Services Center (Phase 4) -->
    <section id="view-plugins" style="display: none;" class="workspace">
      <!-- Sub-Navigation Bar -->
      <div class="ext-subtabs-bar">
        <button class="ext-subtab-btn active" id="ext-subtab-btn-plugins" onclick="switchExtSubTab('plugins')">
          <span>🔌 Native &amp; Wasm Plugins</span>
          <span class="badge badge-slate tabular" id="ext-count-plugins">0</span>
        </button>
        <button class="ext-subtab-btn" id="ext-subtab-btn-udfs" onclick="switchExtSubTab('udfs')">
          <span>⚡ JavaScript UDFs &amp; Functions</span>
          <span class="badge badge-slate tabular" id="ext-count-udfs">0</span>
        </button>
        <button class="ext-subtab-btn" id="ext-subtab-btn-services" onclick="switchExtSubTab('services')">
          <span>🌐 External Services &amp; RPC</span>
          <span class="badge badge-slate tabular" id="ext-count-services">0</span>
        </button>
        <button class="ext-subtab-btn" id="ext-subtab-btn-uploads" onclick="switchExtSubTab('uploads')">
          <span>📁 File Storage &amp; Artifacts</span>
          <span class="badge badge-slate tabular" id="ext-count-uploads">0</span>
        </button>
        <button class="ext-subtab-btn" id="ext-subtab-btn-backup" onclick="switchExtSubTab('backup')">
          <span>💾 Data Backup &amp; Migration</span>
        </button>
        <div style="margin-left: auto; font-size: 11px; color: var(--text-muted); display: flex; align-items: center; gap: 6px;">
          <span class="badge badge-emerald">Single-Binary Runtime</span>
        </div>
      </div>

      <!-- PANEL 1: Plugins Hub (Native & WASM) -->
      <div id="ext-panel-plugins" style="display: flex; flex-direction: column; gap: 16px;">
        <div class="card">
          <div class="card-header" style="display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
            <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
              <span>Native &amp; WebAssembly (Wasm) Plugins</span>
              <span class="badge badge-slate tabular" id="plugins-table-count">0</span>
            </div>
            <div style="display: flex; align-items: center; gap: 8px;">
              <input type="text" id="plugins-search-input" class="text-input" style="padding: 4px 10px; font-size: 12px; width: 170px;" placeholder="Search plugins..." oninput="renderPluginsTable()" />
              <select id="plugins-type-filter" class="select-input" style="padding: 4px 8px; font-size: 12px;" onchange="renderPluginsTable()">
                <option value="all">All Types</option>
                <option value="source">Sources 📥</option>
                <option value="sink">Sinks 📤</option>
                <option value="function">Functions ⚡</option>
                <option value="wasm">Wasm 🦀</option>
                <option value="portable">Portables 📦</option>
              </select>
              <button class="btn btn-sm btn-primary" onclick="openPluginInstallModal()">
                + Register Plugin 🔌
              </button>
            </div>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th style="width: 24%;">Plugin Name</th>
                  <th style="width: 16%;">Type / Target</th>
                  <th style="width: 24%;">Exported Symbols / Codec</th>
                  <th style="width: 18%;">Runtime Mode</th>
                  <th style="width: 18%; text-align: right;">Actions</th>
                </tr>
              </thead>
              <tbody id="plugins-tbody">
                <tr><td colspan="5" class="empty-state">Loading plugins...</td></tr>
              </tbody>
            </table>
          </div>
        </div>
      </div>

      <!-- PANEL 2: JavaScript UDFs & Extensible Functions Studio -->
      <div id="ext-panel-udfs" style="display: none; flex-direction: column; gap: 16px;">
        <div class="two-col">
          <!-- Left: User-Defined JavaScript Functions -->
          <div class="card">
            <div class="card-header" style="display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
              <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
                <span>JavaScript User-Defined Functions (UDF)</span>
                <span class="badge badge-slate tabular" id="udfs-table-count">0</span>
              </div>
              <button class="btn btn-sm btn-primary" onclick="openJsUdfModal()">
                + New JS Function ⚡
              </button>
            </div>
            <div class="table-wrap">
              <table>
                <thead>
                  <tr>
                    <th style="width: 30%;">Function ID</th>
                    <th style="width: 20%;">Kind</th>
                    <th style="width: 32%;">Description</th>
                    <th style="width: 18%; text-align: right;">Actions</th>
                  </tr>
                </thead>
                <tbody id="udfs-tbody">
                  <tr><td colspan="4" class="empty-state">Loading JavaScript UDFs...</td></tr>
                </tbody>
              </table>
            </div>
          </div>

          <!-- Right: SQL Built-in Functions Palette -->
          <div class="card">
            <div class="card-header" style="display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
              <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
                <span>SQL Function Palette &amp; Reference</span>
                <span class="badge badge-indigo tabular" id="sql-funcs-count">221</span>
              </div>
              <div style="display: flex; align-items: center; gap: 6px;">
                <input type="text" id="sql-funcs-search" class="text-input" style="padding: 4px 8px; font-size: 11px; width: 130px;" placeholder="Search function..." oninput="renderSqlFunctionsPalette()" />
                <select id="sql-funcs-category" class="select-input" style="padding: 4px 6px; font-size: 11px;" onchange="renderSqlFunctionsPalette()">
                  <option value="all">All Categories</option>
                  <option value="math">Math</option>
                  <option value="string">String</option>
                  <option value="aggregate">Aggregate</option>
                  <option value="datetime">Date &amp; Time</option>
                  <option value="conversion">Conversion</option>
                  <option value="array">Array</option>
                  <option value="object">Object / JSON</option>
                  <option value="binary">Binary</option>
                  <option value="misc">Misc / System</option>
                </select>
              </div>
            </div>
            <div style="padding: 14px;">
              <div class="func-card-grid" id="sql-funcs-grid">
                <div style="font-size: 12px; color: var(--text-muted);">Loading SQL functions catalog...</div>
              </div>
            </div>
          </div>
        </div>
      </div>

      <!-- PANEL 3: External Services & RPC Hub -->
      <div id="ext-panel-services" style="display: none; flex-direction: column; gap: 16px;">
        <div class="card">
          <div class="card-header" style="display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
            <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
              <span>External Services &amp; RPC Registrations</span>
              <span class="badge badge-slate tabular" id="services-table-count">0</span>
            </div>
            <button class="btn btn-sm btn-primary" onclick="openServiceRegisterModal()">
              + Register Service 🌐
            </button>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th style="width: 25%;">Service Name</th>
                  <th style="width: 30%;">Target Endpoint / Address</th>
                  <th style="width: 27%;">Exported Interfaces / Methods</th>
                  <th style="width: 18%; text-align: right;">Actions</th>
                </tr>
              </thead>
              <tbody id="services-tbody">
                <tr><td colspan="4" class="empty-state">Loading services...</td></tr>
              </tbody>
            </table>
          </div>
        </div>

        <!-- Discovered RPC Functions -->
        <div class="card">
          <div class="card-header">
            <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
              <span>Discovered Service Methods (Available in SQL Projections &amp; Predicates)</span>
              <span class="badge badge-slate tabular" id="service-funcs-count">0</span>
            </div>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th style="width: 25%;">Function Name (SQL)</th>
                  <th style="width: 25%;">Service</th>
                  <th style="width: 25%;">Interface</th>
                  <th style="width: 25%;">Remote Method &amp; Target</th>
                </tr>
              </thead>
              <tbody id="service-funcs-tbody">
                <tr><td colspan="4" class="empty-state">No service functions discovered.</td></tr>
              </tbody>
            </table>
          </div>
        </div>
      </div>

      <!-- PANEL 4: Config & File Uploads Storage -->
      <div id="ext-panel-uploads" style="display: none; flex-direction: column; gap: 16px;">
        <div class="card">
          <div class="card-header" style="display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
            <div class="card-title" style="display: flex; align-items: center; gap: 8px;">
              <span>Edge Configuration &amp; Artifact Storage</span>
              <span class="badge badge-slate tabular" id="uploads-table-count">0</span>
            </div>
            <button class="btn btn-sm btn-primary" onclick="openFileUploadModal()">
              Upload Artifact 📁
            </button>
          </div>
          <div class="table-wrap">
            <table>
              <thead>
                <tr>
                  <th style="width: 32%;">Artifact Filename</th>
                  <th style="width: 22%;">Target Edge Path</th>
                  <th style="width: 26%;">Usage Guidance</th>
                  <th style="width: 20%; text-align: right;">Actions</th>
                </tr>
              </thead>
              <tbody id="uploads-tbody">
                <tr><td colspan="4" class="empty-state">Loading uploaded files...</td></tr>
              </tbody>
            </table>
          </div>
        </div>
      </div>

      <!-- PANEL 5: Data Backup, Export & Migration -->
      <div id="ext-panel-backup" style="display: none; flex-direction: column; gap: 16px;">
        <div class="two-col">
          <!-- Export Card -->
          <div class="card">
            <div class="card-header">
              <div class="card-title">📦 Configuration &amp; Topology Export</div>
            </div>
            <div style="padding: 18px; display: flex; flex-direction: column; gap: 14px;">
              <p style="font-size: 12px; color: var(--text-secondary); margin: 0;">
                Export active streams, lookup tables, rules, plugins, and connections into a unified portable snapshot.
              </p>
              <div style="display: flex; flex-direction: column; gap: 8px; font-size: 12px;">
                <label style="display: flex; align-items: center; gap: 8px; cursor: pointer;">
                  <input type="checkbox" id="export-include-all" checked onchange="toggleExportAll(this.checked)" />
                  <strong>Include Complete Configuration &amp; Pipelines</strong>
                </label>
                <div style="padding-left: 24px; display: flex; flex-direction: column; gap: 6px; color: var(--text-muted);" id="export-details-box">
                  <span>✓ Streams &amp; Tables DDL schemas</span>
                  <span>✓ Rule Execution Pipelines (SQL &amp; Sinks)</span>
                  <span>✓ Shared Connection Pool &amp; ConfKeys</span>
                  <span>✓ Protobuf &amp; Custom Codecs</span>
                  <span>✓ JavaScript User-Defined Functions</span>
                </div>
              </div>
              <div style="display: flex; align-items: center; gap: 10px; margin-top: 6px;">
                <button type="button" class="btn btn-primary" onclick="triggerDataExport('json')">
                  Download JSON Snapshot ⬇
                </button>
                <button type="button" class="btn" onclick="triggerDataExport('yaml')">
                  Download GitOps YAML ⬇
                </button>
              </div>
            </div>
          </div>

          <!-- Import Card -->
          <div class="card">
            <div class="card-header">
              <div class="card-title">📥 Configuration &amp; Topology Restore</div>
            </div>
            <div style="padding: 18px; display: flex; flex-direction: column; gap: 14px;">
              <p style="font-size: 12px; color: var(--text-secondary); margin: 0;">
                Import a previously exported JSON or YAML snapshot. Restores streams, tables, and rules with automatic reconciliation.
              </p>
              <div class="dropzone-box" id="import-dropzone" onclick="document.getElementById('import-file-input').click()">
                <input type="file" id="import-file-input" style="display: none;" accept=".json,.yaml,.yml" onchange="handleImportFileSelect(event)" />
                <div style="font-size: 24px; margin-bottom: 6px;">📂</div>
                <div style="font-weight: 600; font-size: 13px;" id="import-file-label">Click or Drag &amp; Drop JSON / YAML Backup</div>
                <div style="font-size: 11px; color: var(--text-muted); margin-top: 4px;">Supports ekuiper export format and GitOps declarative manifests</div>
              </div>

              <div style="display: flex; align-items: center; justify-content: space-between;">
                <label style="font-size: 12px; display: flex; align-items: center; gap: 6px; cursor: pointer;">
                  <input type="checkbox" id="import-stop-rules" />
                  <span>Import in stopped state</span>
                </label>
                <button type="button" class="btn btn-primary" id="import-submit-btn" onclick="submitDataImport()" disabled>
                  Restore &amp; Apply Snapshot 🚀
                </button>
              </div>

              <div id="import-status-box" style="display: none; padding: 10px 12px; border-radius: 6px; font-size: 12px; font-family: var(--font-mono); line-height: 1.4;"></div>
            </div>
          </div>
        </div>
      </div>
    </section>

    <!-- TAB 4: OTLP & Data Plane Test Console -->
    <section id="view-ingest" style="display: none;" class="two-col">
      <div class="card">
        <div class="card-header">
          <div class="card-title">Data-Plane &amp; OTLP Telemetry Injector</div>
        </div>
        <div style="padding: 18px;">
          <div class="form-group">
            <label class="form-label" for="ingest-endpoint">Target Ingestion Endpoint</label>
            <select id="ingest-endpoint" class="select-input" onchange="loadPresetPayload(this.value)">
              <option value="/v1/metrics">POST /v1/metrics (OTLP/HTTP Metrics JSON)</option>
              <option value="/v1/logs">POST /v1/logs (OTLP/HTTP Logs JSON)</option>
              <option value="/v1/traces">POST /v1/traces (OTLP/HTTP Traces JSON)</option>
              <option value="/data/demo">POST /data/{stream} (HTTP Push Stream JSON)</option>
            </select>
          </div>

          <div class="form-group">
            <label class="form-label" for="ingest-custom-path">Endpoint Path (Editable)</label>
            <input type="text" id="ingest-custom-path" class="text-input" value="/v1/metrics" style="font-family: var(--font-mono);" />
          </div>

          <div class="form-group">
            <label class="form-label" for="ingest-payload">JSON Payload</label>
            <textarea id="ingest-payload" class="text-input"></textarea>
          </div>

          <div style="display: flex; justify-content: flex-end; gap: 10px;">
            <button class="btn" onclick="loadPresetPayload(document.getElementById('ingest-endpoint').value)">Reset Preset</button>
            <button class="btn btn-primary" onclick="sendIngestPayload()">Send Payload</button>
          </div>
        </div>
      </div>

      <div class="card">
        <div class="card-header">
          <div class="card-title">Server Response</div>
        </div>
        <div style="padding: 18px;">
          <pre class="code-block" id="ingest-response" style="min-height: 310px;">Click "Send Payload" to push a test event into rekuiper's data plane.</pre>
        </div>
      </div>
    </section>

    <!-- TAB 4: Prometheus /metrics -->
    <section id="view-metrics" style="display: none;">
      <div class="card">
        <div class="card-header">
          <div class="card-title">Raw Prometheus Exposition (`GET /metrics`)</div>
          <button class="btn btn-sm" onclick="fetchPrometheusMetrics()">Refresh /metrics</button>
        </div>
        <div style="padding: 18px;">
          <pre class="code-block" id="prom-metrics-box" style="max-height: 600px;">Loading /metrics...</pre>
        </div>
      </div>
    </section>

    <!-- TAB 5: Native Visual Stream Studio (design.md Dark & Industrial Theme) -->
    <section id="view-studio" style="display: none;" class="studio-container">
      <!-- Studio Topbar -->
      <div class="studio-topbar">
        <div class="studio-brand">
          <span style="color: #fb923c; display: flex; align-items: center; gap: 6px;">
            <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2"/></svg>
            STREAM DAG STUDIO
          </span>
          <span class="studio-tag">Native Engine</span>
          <div style="display: flex; align-items: center; gap: 6px; margin-left: 6px;">
            <span style="font-size: 11px; color: #64748b;">Rule:</span>
            <input

              type="text"

              id="studio-rule-id"

              class="text-input"

              value="stream_pipeline_01"

              style="width: 185px; background: #141e2e; color: #f8fafc; border-color: #23344d; padding: 4px 8px; font-family: var(--font-mono); font-size: 12px; border-radius: 6px;"
              placeholder="Pipeline / Rule ID"

            />
          </div>
        </div>

        <!-- AI Assistant Natural-Language Synthesis Prompt Bar -->
        <div class="studio-ai-bar">
          <span style="font-size: 14px;">✨</span>
          <input

            type="text"

            id="studio-ai-prompt"

            class="studio-ai-input"

            placeholder="Describe pipeline (e.g. Read factory MQTT -> rate limit 10/s -> switch temp>80 to alerts_mqtt, else timescaledb)..."

            onkeydown="if(event.key==='Enter') synthesizeGraphFromPrompt()"
          />
          <button

            class="studio-btn-ai"

            onclick="synthesizeGraphFromPrompt()"
            title="Compile natural language into interactive DAG"

          >
            ✨ Synthesize Pipeline
          </button>
        </div>

        <!-- Action Controls -->
        <div class="studio-actions">
          <select

            id="studio-preset-select"

            class="select-input"

            onchange="loadStudioPreset(this.value)"
            style="background: #141e2e; color: #f8fafc; border-color: #23344d; font-size: 12px; padding: 4px 8px; border-radius: 6px;"
          >
            <option value="">Load Template...</option>
            <option value="iot_switch">IIoT Switch Router</option>
            <option value="rate_limited">Rate-Limited Edge Pipeline</option>
            <option value="watchdog_alarm">Inactivity Watchdog Alarm</option>
            <option value="window_agg">Window Aggregator &amp; SQL</option>
          </select>

          <button class="btn btn-sm" onclick="autoLayoutNodes()" title="Auto-align nodes into topological columns" style="background:#141e2e; color:#cbd5e1; border-color:#23344d;">
            Auto Layout
          </button>

          <button class="btn btn-sm" onclick="clearStudioCanvas()" title="Clear Canvas" style="background:#141e2e; color:#cbd5e1; border-color:#23344d;">
            Clear
          </button>

          <button class="btn btn-sm" onclick="validateStudioGraph()" title="Validate Topology" style="background:#141e2e; color:#cbd5e1; border-color:#23344d;">
            Validate
          </button>

          <button

            class="btn btn-sm"

            onclick="deployStudioPipeline()"
            style="background: linear-gradient(135deg, #ea580c 0%, #f97316 100%); color: #fff; border: 1px solid #c2410c; font-weight: 600; box-shadow: 0 2px 8px rgba(234,88,12,0.4);"
            title="Deploy DAG rule to live Kuiper engine"

          >
            🚀 Deploy Pipeline
          </button>
        </div>
      </div>

      <!-- Studio Workspace: Palette + Canvas + Drawer -->
      <div class="studio-body">
        <!-- Left Palette Sidebar -->
        <aside class="studio-palette" id="studio-palette">
          <div class="palette-search-wrap">
            <input

              type="search"

              id="palette-search"

              placeholder="Search components..."

              oninput="filterPalette(this.value)"
              class="palette-search"

            />
            <div class="palette-filter-chips">
              <button class="palette-chip active" id="chip-all" onclick="setPaletteFilter('all')">All</button>
              <button class="palette-chip" id="chip-source" onclick="setPaletteFilter('source')">Sources</button>
              <button class="palette-chip" id="chip-operator" onclick="setPaletteFilter('operator')">Process</button>
              <button class="palette-chip" id="chip-sink" onclick="setPaletteFilter('sink')">Sinks</button>
            </div>
          </div>
          <div class="palette-items-list" id="palette-items-list">
            <!-- Dynamically populated from /api/v1/palette -->
          </div>
        </aside>

        <!-- Main Interactive DAG Canvas -->
        <div class="studio-canvas-container" id="studio-canvas-container">
          <!-- SVG Wire Layer -->
          <svg id="studio-svg-layer" class="studio-svg-layer">
            <defs>
              <marker id="arrowhead" viewBox="0 0 10 10" refX="8" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
                <path d="M 0 0 L 10 5 L 0 10 z" fill="#ea580c"/>
              </marker>
              <marker id="arrowhead-selected" viewBox="0 0 10 10" refX="8" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
                <path d="M 0 0 L 10 5 L 0 10 z" fill="#fb923c"/>
              </marker>
            </defs>
            <g id="studio-wires-group"></g>
            <path id="studio-drag-wire" d="" style="display: none;" stroke="#fb923c" stroke-width="2.5" stroke-dasharray="5 3" fill="none" />
          </svg>

          <!-- HTML Draggable Nodes Container -->
          <div id="studio-nodes-layer" class="studio-nodes-layer"></div>

          <!-- Bottom Floating Canvas Controls -->
          <div class="canvas-controls">
            <button class="canvas-ctl-btn" onclick="zoomCanvas(0.1)" title="Zoom In">+</button>
            <span id="canvas-zoom-level" style="font-family: var(--font-mono); font-size: 11px; color: #94a3b8; padding: 0 4px;">100%</span>
            <button class="canvas-ctl-btn" onclick="zoomCanvas(-0.1)" title="Zoom Out">-</button>
            <button class="canvas-ctl-btn" onclick="resetCanvasTransform()" title="Reset View">&#x2302;</button>
            <button class="canvas-ctl-btn" onclick="autoLayoutNodes()" title="Auto Layout">&#x2630;</button>
            <span style="border-left: 1px solid #1e293b; margin: 0 4px; height: 14px;"></span>
            <span id="canvas-node-counter" style="font-size: 11px; color: #64748b; font-family: var(--font-mono);">0 nodes</span>
          </div>
        </div>

        <!-- Right Side Inspection & Wire-Tap Drawer -->
        <aside class="studio-drawer" id="studio-drawer">
          <div class="drawer-tabs">
            <button class="drawer-tab active" id="drawer-tab-node" onclick="switchDrawerTab('node')">
              Node &amp; Wire-Tap
            </button>
            <button class="drawer-tab" id="drawer-tab-json" onclick="switchDrawerTab('json')">
              GraphRule JSON
            </button>
          </div>

          <div class="drawer-body">
            <!-- PANE 1: Node Properties & Live Comms Wire-Tap -->
            <div id="drawer-pane-node" class="drawer-pane active">
              <div id="node-inspector-empty" style="text-align: center; color: #64748b; padding: 40px 10px;">
                <div style="font-size: 24px; margin-bottom: 8px;">🔍</div>
                <div style="font-size: 13px; font-weight: 600; color: #94a3b8; margin-bottom: 4px;">No Node Selected</div>
                <div style="font-size: 11.5px;">Click any node on the DAG canvas to edit properties, inspect live metrics, or wire-tap /comms telemetry.</div>
              </div>

              <div id="node-inspector-content" style="display: none;">
                <!-- Node Header Info -->
                <div style="display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px;">
                  <div>
                    <span id="insp-node-category" class="badge badge-slate" style="font-size: 10px; text-transform: uppercase;"></span>
                    <h3 id="insp-node-title" style="font-size: 14px; font-weight: 700; color: #f8fafc; margin-top: 4px;"></h3>
                  </div>
                  <button class="btn btn-sm" onclick="deleteSelectedNode()" style="background: rgba(239,68,68,0.15); color: #ef4444; border: 1px solid rgba(239,68,68,0.3);" title="Delete node">
                    Delete
                  </button>
                </div>

                <div class="form-group">
                  <label class="form-label" style="color: #94a3b8;">Node ID (Topology Key)</label>
                  <input type="text" id="insp-node-id" class="text-input" style="background: #060911; color: #f8fafc; border-color: #1e293b; font-family: var(--font-mono); font-size: 12px;" onchange="updateSelectedNodeId(this.value)" />
                </div>

                <!-- Dynamic Node Properties Form -->
                <div id="insp-node-props-form"></div>

                <!-- Wire-Tap & /comms Stream Inspection Panel -->
                <div class="wire-tap-panel">
                  <div class="wire-tap-panel-header">
                    <div style="display: flex; align-items: center; gap: 6px;">
                      <span style="font-size: 12px; font-weight: 700; color: #f8fafc;">/comms Wire-Tap</span>
                      <span id="insp-tap-status-pill" class="badge badge-slate" style="font-size: 10px;">Standby</span>
                    </div>
                    <button id="insp-tap-toggle-btn" class="btn btn-sm" onclick="toggleSelectedNodeWireTap()" style="background: #ea580c; color: #fff; border: none; font-size: 11px; padding: 3px 8px;">
                      ⚡ Enable Tap
                    </button>
                  </div>

                  <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-size: 11px; color: #94a3b8; font-family: var(--font-mono);">
                    <span>Token Limit: <strong>20 msg/s</strong></span>
                    <span id="insp-tap-dropped-badge" style="color: #fb923c;">Dropped: 0</span>
                  </div>

                  <!-- Connector Status (if source/sink) -->
                  <div id="insp-connector-status-row" style="display: none; margin-bottom: 8px; font-size: 11px; padding: 6px 8px; background: #060911; border: 1px solid #1e293b; border-radius: 4px;">
                    <span style="color: #64748b;">Connector Status:</span>
                    <strong id="insp-connector-status-val" style="color: #10B981; margin-left: 4px;">Connected</strong>
                  </div>

                  <!-- Monospace Live Tuple Terminal -->
                  <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">
                    <span style="font-size: 10px; text-transform: uppercase; letter-spacing: 0.05em; color: #64748b; font-weight: 600;">Live Record Stream</span>
                    <button style="background: transparent; border: none; color: #64748b; font-size: 10px; cursor: pointer;" onclick="clearTapTerminal()">Clear</button>
                  </div>
                  <pre class="terminal-window" id="insp-tap-terminal">No active wire-tap on this node. Click 'Enable Tap' to stream live tuples across /comms.</pre>
                </div>
              </div>
            </div>

            <!-- PANE 2: Two-Way GraphRule JSON Sync -->
            <div id="drawer-pane-json" class="drawer-pane">
              <div style="font-size: 11.5px; color: #94a3b8; margin-bottom: 10px;">
                Direct two-way synchronization with the visual DAG canvas. You can edit the <code>GraphRule</code> definition below and click <strong>Apply to Canvas</strong>, or deploy directly to the engine.
              </div>
              <textarea id="studio-json-editor" class="json-sync-textarea" spellcheck="false" placeholder="Generating GraphRule JSON..."></textarea>
              <div style="display: flex; gap: 8px; margin-top: 10px; justify-content: flex-end;">
                <button class="btn btn-sm" onclick="formatStudioJson()" style="background:#1e293b; color:#cbd5e1; border-color:#334155;">
                  Format JSON
                </button>
                <button class="btn btn-sm" onclick="applyJsonToCanvas()" style="background:#1e293b; color:#fb923c; border-color:#ea580c; font-weight:600;">
                  Apply to Canvas
                </button>
                <button class="btn btn-sm btn-primary" onclick="deployStudioPipeline()" style="background:#ea580c; border-color:#c2410c; font-weight:600;">
                  Deploy
                </button>
              </div>
            </div>
          </div>
        </aside>
      </div>
    </section>

    <!-- View 6: Fleet Control Plane ("Rekuiper Manager") -->
    <section id="view-fleet" style="display: none; flex-direction: column; gap: 24px;">
      
      <!-- Fleet Summary KPI Strip -->
      <section class="kpi-grid">
        <div class="kpi-card">
          <div class="kpi-label">
            <span>FLEET GATEWAYS</span>
            <span class="badge badge-emerald" id="fleet-kpi-online-badge">0 Online</span>
          </div>
          <div class="kpi-value tabular" id="fleet-kpi-total">0</div>
          <div class="kpi-sub tabular">
            <span id="fleet-kpi-online-sub">0 connected Yamux agents</span>
          </div>
        </div>

        <div class="kpi-card">
          <div class="kpi-label">
            <span>STAGED ROLLOUTS</span>
            <span class="badge badge-indigo" id="fleet-kpi-rollouts-badge">Active</span>
          </div>
          <div class="kpi-value tabular" id="fleet-kpi-rollouts">0</div>
          <div class="kpi-sub tabular">
            <span id="fleet-kpi-canary-sub">0 Canary evaluating</span>
          </div>
        </div>

        <div class="kpi-card">
          <div class="kpi-label">
            <span>FLEET IMMUTABLE SNAPSHOTS</span>
          </div>
          <div class="kpi-value tabular" id="fleet-kpi-snapshots">0</div>
          <div class="kpi-sub tabular">
            <span>Declarative SHA-256 verified</span>
          </div>
        </div>

        <div class="kpi-card">
          <div class="kpi-label">
            <span>FLEET DLQ &amp; ROLLBACK ALERTS</span>
            <span class="badge badge-slate" id="fleet-kpi-dlq-badge">Clean</span>
          </div>
          <div class="kpi-value tabular" id="fleet-kpi-dlq">0</div>
          <div class="kpi-sub tabular">
            <span id="fleet-kpi-rollback-sub">0 auto-rollbacks</span>
          </div>
        </div>
      </section>

      <!-- Staged Canary Rollout Pipeline Card -->
      <div class="card">
        <div class="card-header">
          <div class="card-title">
            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="22 12 18 12 15 21 9 3 6 12 2 12"></polyline></svg>
            Staged Rollout Pipeline &amp; Canary Gates
          </div>
          <div style="display:flex; align-items:center; gap:8px;">
            <button class="btn btn-sm btn-primary" onclick="openNewRolloutModal()">
              + New Rollout
            </button>
            <button class="btn btn-sm" onclick="refreshFleetData(true)">
              &#x21bb; Refresh
            </button>
          </div>
        </div>

        <div style="padding: 20px; border-bottom: 1px solid var(--border); background: var(--bg-canvas);">
          <!-- Visual Pipeline Track -->
          <div class="pipeline-container">
            <div class="pipeline-step" id="pipe-step-dev">
              <div class="pipeline-node" id="pipe-node-dev">1</div>
              <div class="pipeline-text">
                <div class="pipeline-title">Development</div>
                <div class="pipeline-sub">Initial validation</div>
              </div>
            </div>
            <div class="pipeline-connector"></div>
            <div class="pipeline-step" id="pipe-step-staging">
              <div class="pipeline-node" id="pipe-node-staging">2</div>
              <div class="pipeline-text">
                <div class="pipeline-title">Staging</div>
                <div class="pipeline-sub">Integration testing</div>
              </div>
            </div>
            <div class="pipeline-connector"></div>
            <div class="pipeline-step" id="pipe-step-canary">
              <div class="pipeline-node" id="pipe-node-canary">3</div>
              <div class="pipeline-text">
                <div class="pipeline-title">Canary Gate (5%)</div>
                <div class="pipeline-sub">Watchdog &amp; DLQ checks</div>
              </div>
            </div>
            <div class="pipeline-connector"></div>
            <div class="pipeline-step" id="pipe-step-prod">
              <div class="pipeline-node" id="pipe-node-prod">4</div>
              <div class="pipeline-text">
                <div class="pipeline-title">Production (100%)</div>
                <div class="pipeline-sub">Full fleet promotion</div>
              </div>
            </div>
          </div>
        </div>

        <!-- Rollouts Table -->
        <div class="table-wrap">
          <table>
            <thead>
              <tr>
                <th>Rollout ID</th>
                <th>Snapshot ID</th>
                <th>Target Cohort / Group</th>
                <th>Current Stage</th>
                <th>Status</th>
                <th>Success / Target</th>
                <th>Last Error / Health</th>
                <th style="text-align: right;">Actions</th>
              </tr>
            </thead>
            <tbody id="fleet-rollouts-tbody">
              <tr>
                <td colspan="8" style="text-align: center; color: var(--text-muted); padding: 24px;">
                  No active rollouts found. Click "+ New Rollout" to trigger a staged Canary pipeline.
                </td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>

      <!-- Device Fleet Catalog Card -->
      <div class="card">
        <div class="card-header">
          <div class="card-title">
            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="2" width="20" height="8" rx="2" ry="2"></rect><rect x="2" y="14" width="20" height="8" rx="2" ry="2"></rect><line x1="6" y1="6" x2="6.01" y2="6"></line><line x1="6" y1="18" x2="6.01" y2="18"></line></svg>
            Edge Device Fleet Catalog
            <span class="badge badge-slate tabular" id="fleet-catalog-count-badge">0 devices</span>
          </div>

          <!-- Catalog Filter Toolbar -->
          <div style="display:flex; align-items:center; gap:8px; flex-wrap:wrap;">
            <input

              type="search"

              id="fleet-filter-search"

              class="text-input"

              placeholder="Filter by ID, name, or version..."

              oninput="renderFleetDevices()"
              style="width: 220px;"
            />
            <select id="fleet-filter-plant" class="select-input" onchange="renderFleetDevices()">
              <option value="all">All Plants</option>
            </select>
            <select id="fleet-filter-region" class="select-input" onchange="renderFleetDevices()">
              <option value="all">All Regions</option>
            </select>
            <select id="fleet-filter-status" class="select-input" onchange="renderFleetDevices()">
              <option value="all">All Statuses</option>
              <option value="online">Online</option>
              <option value="degraded">Degraded</option>
              <option value="offline">Offline</option>
            </select>
          </div>
        </div>

        <div class="table-wrap">
          <table>
            <thead>
              <tr>
                <th>Status</th>
                <th>Device ID &amp; Name</th>
                <th>Plant &amp; Region</th>
                <th>Type &amp; Version</th>
                <th>CPU / Mem</th>
                <th>Active Snapshot</th>
                <th>Rules &amp; DLQ</th>
                <th>Last Heartbeat</th>
                <th style="text-align: right;">Actions</th>
              </tr>
            </thead>
            <tbody id="fleet-devices-tbody">
              <tr>
                <td colspan="9" style="text-align: center; color: var(--text-muted); padding: 24px;">
                  No edge devices currently connected to Control Plane (/fleet/ws).
                </td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>

      <!-- Split Bottom Grid: DLQ Alerts & Immutable Audit Log -->
      <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 20px;">
        
        <!-- Fleet DLQ & Health Alerts -->
        <div class="card">
          <div class="card-header">
            <div class="card-title">
              <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle><line x1="12" y1="8" x2="12" y2="12"></line><line x1="12" y1="16" x2="12.01" y2="16"></line></svg>
              Fleet DLQ &amp; Rollback Alerts
            </div>
            <span class="badge badge-rose tabular" id="fleet-dlq-count-badge">0 Alerts</span>
          </div>
          <div class="table-wrap" style="max-height: 280px; overflow-y: auto;">
            <table>
              <thead>
                <tr>
                  <th>Device ID</th>
                  <th>DLQ Count</th>
                  <th>Watchdog Rollback Reason</th>
                  <th>Last Seen</th>
                </tr>
              </thead>
              <tbody id="fleet-dlq-tbody">
                <tr>
                  <td colspan="4" style="text-align: center; color: var(--text-muted); padding: 18px;">
                    No edge anomalies or DLQ overflows reported.
                  </td>
                </tr>
              </tbody>
            </table>
          </div>
        </div>

        <!-- Immutable Audit Trail -->
        <div class="card">
          <div class="card-header">
            <div class="card-title">
              <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path><polyline points="14 2 14 8 20 8"></polyline><line x1="16" y1="13" x2="8" y2="13"></line><line x1="16" y1="17" x2="8" y2="17"></line><polyline points="10 9 9 9 8 9"></polyline></svg>
              Control Plane Audit Trail (kv.rs)
            </div>
            <button class="btn btn-sm" onclick="refreshFleetData(false)">
              &#x21bb;
            </button>
          </div>
          <div class="table-wrap" style="max-height: 280px; overflow-y: auto;">
            <table>
              <thead>
                <tr>
                  <th>Timestamp</th>
                  <th>Action</th>
                  <th>Target</th>
                  <th>Status</th>
                  <th>Details</th>
                </tr>
              </thead>
              <tbody id="fleet-audit-tbody">
                <tr>
                  <td colspan="5" style="text-align: center; color: var(--text-muted); padding: 18px;">
                    Audit log is currently empty.
                  </td>
                </tr>
              </tbody>
            </table>
          </div>
        </div>

      </div>

    </section>

    <!-- Remote Yamux Proxy Inspection Modal -->
    <div id="fleet-inspect-modal" class="fleet-modal-backdrop" style="display: none;">
      <div class="fleet-modal-dialog" style="max-width: 840px;">
        <div class="fleet-modal-header">
          <div style="display: flex; align-items: center; gap: 8px;">
            <span class="badge badge-emerald" id="inspect-device-status-badge">Online</span>
            <strong id="inspect-modal-title" style="font-size: 15px;">Remote Edge Gateway Inspection</strong>
            <span style="font-size: 12px; color: var(--text-muted); font-family: var(--font-mono);" id="inspect-modal-device-id"></span>
          </div>
          <button class="btn btn-sm" onclick="closeRemoteInspectModal()">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="display: flex; flex-direction: column; gap: 14px;">
          <div style="display: flex; align-items: center; justify-content: space-between; background: var(--bg-subtle); padding: 10px 14px; border-radius: 6px; flex-wrap: wrap; gap: 8px;">
            <div style="display: flex; gap: 16px; font-size: 12px; align-items: center;">
              <div>Plant: <strong id="inspect-device-plant">-</strong></div>
              <div>Region: <strong id="inspect-device-region">-</strong></div>
              <div>Type: <strong id="inspect-device-type">-</strong></div>
              <div>Tunnel: <span class="badge badge-emerald" style="padding: 2px 6px;">Yamux Stream 1..N</span></div>
            </div>
            <div style="display: flex; gap: 6px; flex-wrap: wrap;">
              <button class="btn btn-sm" onclick="fetchProxyEndpoint('/rules')">/rules</button>
              <button class="btn btn-sm" onclick="fetchProxyEndpoint('/streams')">/streams</button>
              <button class="btn btn-sm" onclick="fetchProxyEndpoint('/metrics')">/metrics</button>
              <button class="btn btn-sm" onclick="fetchProxyEndpoint('/version')">/version</button>
              <button class="btn btn-sm" onclick="fetchProxyEndpoint('/')">/ (Sysinfo)</button>
            </div>
          </div>

          <div style="display: flex; justify-content: space-between; align-items: center;">
            <div style="font-size: 12px; font-weight: 600; color: var(--text-muted);" id="inspect-target-url-label">
              Tunneled: GET /api/v1/fleet/devices/:id/proxy/rules
            </div>
            <button class="btn btn-sm" onclick="refreshCurrentProxyInspection()">&#x21bb; Re-query Tunnel</button>
          </div>

          <pre id="inspect-response-box" style="background: #060911; color: #f8fafc; font-family: var(--font-mono); font-size: 12px; padding: 14px; border-radius: 8px; max-height: 420px; overflow: auto; line-height: 1.5; white-space: pre-wrap; word-break: break-all; border: 1px solid #1e293b;">Connecting to edge gateway over Yamux multiplexed proxy...</pre>
        </div>

        <div class="fleet-modal-footer">
          <button class="btn" onclick="closeRemoteInspectModal()">Close</button>
        </div>
      </div>
    </div>

    <!-- New Staged Rollout Modal -->
    <div id="fleet-rollout-modal" class="fleet-modal-backdrop" style="display: none;">
      <div class="fleet-modal-dialog" style="max-width: 540px;">
        <div class="fleet-modal-header">
          <strong style="font-size: 15px;">Create Staged Canary Rollout</strong>
          <button class="btn btn-sm" onclick="closeNewRolloutModal()">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="display: flex; flex-direction: column; gap: 14px;">
          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Rollout ID</label>
            <input type="text" id="new-rollout-id" class="text-input" style="width: 100%;" placeholder="e.g. rollout-prod-v2-5" />
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Snapshot ID</label>
            <select id="new-rollout-snapshot-id" class="select-input" style="width: 100%;">
              <option value="">Select an immutable snapshot...</option>
            </select>
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Target Plant / Region / Cohort</label>
            <input type="text" id="new-rollout-group" class="text-input" style="width: 100%;" placeholder="e.g. plant-detroit or all" value="all" />
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Initial Target Stage</label>
            <select id="new-rollout-stage" class="select-input" style="width: 100%;">
              <option value="canary">Canary (5% Gate)</option>
              <option value="dev">Dev</option>
              <option value="staging">Staging</option>
              <option value="production">Production (100%)</option>
            </select>
          </div>

          <div style="font-size: 12px; color: var(--text-muted); background: var(--bg-subtle); padding: 10px; border-radius: 6px;">
            &#x24d8; <strong>Health-Gated Rollout:</strong> If deployed to Canary first, any watchdog rollback or DLQ spike from Canary devices will automatically HALT the rollout and mark it rolled_back.
          </div>
        </div>

        <div class="fleet-modal-footer">
          <button class="btn" onclick="closeNewRolloutModal()">Cancel</button>
          <button class="btn btn-primary" onclick="submitCreateRollout()">Start Rollout</button>
        </div>
      </div>
    </div>

    <!-- Guided 3-Step Rule Designer & Pipeline Builder Modal -->
    <div id="rule-designer-modal" class="fleet-modal-overlay" style="display: none; z-index: 105;">
      <div class="fleet-modal-dialog" style="max-width: 1120px; width: 95vw; height: 86vh; max-height: 860px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 12px;">
            <span style="font-size: 18px;">🪄</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="rule-designer-modal-title">Guided Rule Pipeline Designer</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Step-by-step SQL formulation, multi-sink routing &amp; live engine preflight validation</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeRuleDesignerModal()" title="Close">&#x2715;</button>
        </div>

        <!-- 3-Step Visual Stepper -->
        <div class="designer-stepper">
          <button type="button" class="designer-step-tab active" id="rule-step-tab-1" onclick="goToRuleDesignerStep(1)">
            <span class="step-number">1</span>
            <span>Source &amp; SQL Query</span>
          </button>
          <button type="button" class="designer-step-tab" id="rule-step-tab-2" onclick="goToRuleDesignerStep(2)">
            <span class="step-number">2</span>
            <span>Multi-Sink Outputs</span>
          </button>
          <button type="button" class="designer-step-tab" id="rule-step-tab-3" onclick="goToRuleDesignerStep(3)">
            <span class="step-number">3</span>
            <span>Runtime &amp; Resilience</span>
          </button>
        </div>

        <!-- Modal Body: Split Form + Live JSON Preview -->
        <div class="fleet-modal-body" style="flex: 1; overflow: hidden; padding: 16px 20px;">
          <div class="designer-split" style="height: 100%;">
            
            <!-- Left Column: Step-specific Visual Form -->
            <div class="designer-form-col">
              
              <!-- STEP 1: Source & SQL Query -->
              <div id="rule-step-view-1" style="display: flex; flex-direction: column; gap: 14px;">
                <div>
                  <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Pipeline / Rule ID <span style="color:var(--rose-dot)">*</span></label>
                  <input type="text" id="rd-rule-id" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. rule_motor_overheat_alert" oninput="updateRuleDesignerPreview()" />
                </div>

                <div style="display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--border); padding-bottom: 8px;">
                  <span style="font-size: 12px; font-weight: 600; color: var(--text-secondary);">Query Construction Mode</span>
                  <div style="display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden;">
                    <button type="button" id="rd-mode-btn-form" class="btn btn-sm" style="border:none; border-radius:0; background: var(--accent); color: #fff; font-size: 11px;" onclick="setRuleQueryMode('form')">Visual Builder</button>
                    <button type="button" id="rd-mode-btn-raw" class="btn btn-sm" style="border:none; border-radius:0; background: var(--bg-surface); color: var(--text-secondary); font-size: 11px;" onclick="setRuleQueryMode('raw')">Raw SQL</button>
                  </div>
                </div>

                <!-- Zero-Knowledge Rule Recipes -->
                <div style="background: var(--bg-subtle); padding: 8px 12px; border-radius: 6px; border: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 6px;">
                  <span style="font-size: 11px; font-weight: 600; color: var(--text-secondary);">⚡ Zero-Knowledge Rule Recipes:</span>
                  <div style="display: flex; gap: 6px; flex-wrap: wrap;">
                    <button type="button" class="recipe-btn" onclick="loadRuleRecipe('overheat')" title="Alert when temperature exceeds 80°C">🌡 Overheat Alert</button>
                    <button type="button" class="recipe-btn" onclick="loadRuleRecipe('moving_avg')" title="10-second tumbling moving average">📊 10s Average</button>
                    <button type="button" class="recipe-btn" onclick="loadRuleRecipe('vibration')" title="Spike detection for machinery">📈 Anomaly Spike</button>
                    <button type="button" class="recipe-btn" onclick="loadRuleRecipe('dedup')" title="Deduplicate consecutive states">🔄 Deduplicate</button>
                  </div>
                </div>

                <!-- Visual Builder Panel -->
                <div id="rd-visual-panel" style="display: flex; flex-direction: column; gap: 12px;">
                  <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 12px;">
                    <div>
                      <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">
                        <label style="font-size: 12px; font-weight: 600;">Source Stream or Table <span style="color:var(--rose-dot)">*</span></label>
                        <a href="javascript:void(0)" onclick="openDoc('guide/streams/overview')" class="doc-pill-link">📖 Stream Docs</a>
                      </div>
                      <select id="rd-source-select" class="select-input" style="width: 100%;" onchange="onRuleSourceChange()">
                        <option value="">Select source stream/table...</option>
                      </select>
                    </div>
                    <div>
                      <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">
                        <label style="font-size: 12px; font-weight: 600;">Projections (SELECT)</label>
                        <a href="javascript:void(0)" onclick="openDoc('sqls/query_language_elements#select-clause')" class="doc-pill-link">📖 SELECT Docs</a>
                      </div>
                      <input type="text" id="rd-select-fields" class="text-input" style="width: 100%; font-family: var(--font-mono);" value="*" placeholder="* or temperature, humidity, ts" oninput="onVisualSqlFormChange()" />
                    </div>
                  </div>

                  <!-- Clickable Stream Field Pills -->
                  <div id="rd-field-pills-container" style="display: none; padding: 6px 10px; background: var(--bg-surface); border: 1px solid var(--border); border-radius: 6px;">
                    <div style="font-size: 11px; font-weight: 600; color: var(--text-muted); margin-bottom: 4px;">Click any field to append to SELECT / WHERE:</div>
                    <div id="rd-field-pills" style="display: flex; flex-wrap: wrap; gap: 6px;"></div>
                  </div>

                  <div>
                    <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">
                      <label style="font-size: 12px; font-weight: 600;">WHERE Filter Predicate</label>
                      <a href="javascript:void(0)" onclick="openDoc('sqls/query_language_elements#where-clause')" class="doc-pill-link">📖 WHERE Docs</a>
                    </div>
                    <input type="text" id="rd-where-clause" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. temperature &gt; 65.0 AND status = 'active'" oninput="onVisualSqlFormChange()" />
                  </div>

                  <!-- Windowing Settings -->
                  <div style="background: var(--bg-subtle); padding: 12px; border-radius: 6px; border: 1px solid var(--border); display: flex; flex-direction: column; gap: 8px;">
                    <div style="display: flex; justify-content: space-between; align-items: center;">
                      <span style="font-size: 12px; font-weight: 600;">Streaming Windowing</span>
                      <div style="display: flex; gap: 6px; align-items: center;">
                        <span style="font-size: 11px; color: var(--text-muted);">Optional temporal aggregation</span>
                        <a href="javascript:void(0)" onclick="openDoc('concepts/streaming/windowing')" class="doc-pill-link">📖 Windowing Guide</a>
                      </div>
                    </div>
                    <div style="display: grid; grid-template-columns: 1.2fr 0.8fr 1fr; gap: 8px;">
                      <div>
                        <select id="rd-window-type" class="select-input" style="width: 100%; font-size: 12px;" onchange="onVisualSqlFormChange(); updateWindowExplanation();">
                          <option value="none">No Window (Event-by-Event)</option>
                          <option value="tumbling_time">Tumbling Window (Time)</option>
                          <option value="tumbling_count">Tumbling Window (Count)</option>
                          <option value="hopping_time">Hopping / Sliding Window</option>
                          <option value="session_time">Session Window</option>
                        </select>
                      </div>
                      <div>
                        <input type="number" id="rd-window-val" class="text-input" style="width: 100%; font-size: 12px;" value="10" placeholder="Duration" oninput="onVisualSqlFormChange()" />
                      </div>
                      <div>
                        <select id="rd-window-unit" class="select-input" style="width: 100%; font-size: 12px;" onchange="onVisualSqlFormChange()">
                          <option value="ss">Seconds (ss)</option>
                          <option value="mm">Minutes (mm)</option>
                          <option value="hh">Hours (hh)</option>
                          <option value="count">Count (rows)</option>
                        </select>
                      </div>
                    </div>
                    <div id="rd-window-explanation" style="font-size: 11px; color: var(--text-muted); padding: 4px 8px; background: var(--bg-surface); border-radius: 4px; border: 1px solid var(--border);">
                      Processes each incoming event immediately as it arrives with zero buffering.
                    </div>
                  </div>

                  <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 12px;">
                    <div>
                      <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">
                        <label style="font-size: 12px; font-weight: 600;">GROUP BY</label>
                        <a href="javascript:void(0)" onclick="openDoc('sqls/query_language_elements#group-by-clause')" class="doc-pill-link">📖 GROUP BY Docs</a>
                      </div>
                      <input type="text" id="rd-groupby-clause" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. device_id, plant_id" oninput="onVisualSqlFormChange()" />
                    </div>
                    <div>
                      <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">HAVING</label>
                      <input type="text" id="rd-having-clause" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. avg(temperature) &gt; 80" oninput="onVisualSqlFormChange()" />
                    </div>
                  </div>

                  <div style="display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 12px;">
                    <div>
                      <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">ORDER BY</label>
                      <input type="text" id="rd-orderby-clause" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. ts DESC" oninput="onVisualSqlFormChange()" />
                    </div>
                    <div>
                      <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">LIMIT</label>
                      <input type="number" id="rd-limit-clause" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. 100" oninput="onVisualSqlFormChange()" />
                    </div>
                  </div>
                </div>

                <!-- Raw SQL Panel -->
                <div id="rd-raw-panel" style="display: none; flex-direction: column; gap: 8px;">
                  <div style="display: flex; gap: 6px; flex-wrap: wrap; align-items: center; justify-content: space-between;">
                    <div style="display: flex; gap: 6px; flex-wrap: wrap;">
                      <button type="button" class="btn btn-sm" onclick="insertSqlSnippet('SELECT * FROM ')">SELECT *</button>
                      <button type="button" class="btn btn-sm" onclick="insertSqlSnippet('WHERE temperature &gt; 50.0')">WHERE</button>
                      <button type="button" class="btn btn-sm" onclick="insertSqlSnippet('GROUP BY TumblingWindow(ss, 10)')">TumblingWindow</button>
                      <button type="button" class="btn btn-sm" onclick="insertSqlSnippet('GROUP BY HoppingWindow(ss, 10, 5)')">HoppingWindow</button>
                      <select id="rd-func-insert-select" class="select-input" style="font-size: 11px; padding: 2px 6px;" onchange="insertSqlFunctionSnippet(this.value); this.value='';">
                        <option value="">+ Insert SQL Function...</option>
                        <option value="avg">avg(val) — Average</option>
                        <option value="count">count(*) — Count Rows</option>
                        <option value="max">max(val) — Maximum</option>
                        <option value="min">min(val) — Minimum</option>
                        <option value="abs">abs(val) — Absolute Value</option>
                        <option value="round">round(val, 2) — Round Decimal</option>
                        <option value="format_time">format_time(ts, 'YYYY-MM-DD HH:mm:ss')</option>
                        <option value="json_path_query">json_path_query(col, '$.key')</option>
                        <option value="celsius_to_fahrenheit">celsius_to_fahrenheit(c)</option>
                      </select>
                    </div>
                    <a href="javascript:void(0)" onclick="openDoc('sqls/functions/overview')" class="doc-pill-link">📖 221+ Functions Reference</a>
                  </div>
                  <textarea id="rd-raw-sql" class="text-input" style="width: 100%; height: 260px; font-family: var(--font-mono); font-size: 13px; line-height: 1.5; resize: vertical;" placeholder="SELECT * FROM demo WHERE temperature &gt; 50.0" oninput="onRawSqlChange()"></textarea>
                </div>
              </div>

              <!-- STEP 2: Multi-Sink Outputs -->
              <div id="rule-step-view-2" style="display: none; flex-direction: column; gap: 14px;">
                <div style="display: flex; justify-content: space-between; align-items: center;">
                  <div>
                    <strong style="font-size: 13px;">Egress Sinks &amp; Delivery Routing</strong>
                    <div style="font-size: 11px; color: var(--text-muted);">Route pipeline events to one or more edge/cloud destinations</div>
                  </div>
                  <button type="button" class="btn btn-sm btn-primary" onclick="addRuleDesignerSink()">+ Add Sink</button>
                </div>

                <div id="rd-sinks-container" style="display: flex; flex-direction: column; gap: 12px; overflow-y: auto;">
                  <!-- Rendered dynamically -->
                </div>
              </div>

              <!-- STEP 3: Runtime & Resilience Options -->
              <div id="rule-step-view-3" style="display: none; flex-direction: column; gap: 14px;">
                <div>
                  <strong style="font-size: 13px;">Execution Runtime &amp; QoS Guarantees</strong>
                  <div style="font-size: 11px; color: var(--text-muted);">Fine-tune concurrency, checkpointing, event-time semantics, and error handling</div>
                </div>

                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 12px;">
                  <div>
                    <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Quality of Service (QoS)</label>
                    <select id="rd-opt-qos" class="select-input" style="width: 100%;" onchange="updateRuleDesignerPreview()">
                      <option value="0">0 — At Most Once (Fastest, zero state replay)</option>
                      <option value="1">1 — At Least Once (Acknowledged delivery)</option>
                      <option value="2">2 — Exactly Once (State snapshot checkpointing)</option>
                    </select>
                  </div>
                  <div>
                    <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Checkpoint Interval (ms)</label>
                    <input type="number" id="rd-opt-checkpoint" class="text-input" style="width: 100%;" value="300000" oninput="updateRuleDesignerPreview()" />
                  </div>
                </div>

                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 12px;">
                  <div>
                    <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Operator Concurrency</label>
                    <input type="number" id="rd-opt-concurrency" class="text-input" style="width: 100%;" value="1" min="1" max="64" oninput="updateRuleDesignerPreview()" />
                  </div>
                  <div>
                    <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Ring Buffer Length</label>
                    <input type="number" id="rd-opt-buffer" class="text-input" style="width: 100%;" value="1024" oninput="updateRuleDesignerPreview()" />
                  </div>
                </div>

                <!-- Event Time & Late Tolerance -->
                <div style="background: var(--bg-subtle); padding: 12px; border-radius: 6px; border: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px;">
                  <label style="display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 600; cursor: pointer;">
                    <input type="checkbox" id="rd-opt-is-event-time" onchange="toggleEventTimeFields(); updateRuleDesignerPreview();" />
                    <span>Use Event-Time Semantics (extract timestamp from payload)</span>
                  </label>
                  <div id="rd-event-time-fields" style="display: none; grid-template-columns: 1.2fr 0.8fr; gap: 10px;">
                    <div>
                      <label style="display: block; font-size: 11px; font-weight: 600; margin-bottom: 3px;">Timestamp Field</label>
                      <input type="text" id="rd-opt-ts-field" class="text-input" style="width: 100%; font-size: 12px;" placeholder="e.g. ts or timestamp" value="ts" oninput="updateRuleDesignerPreview()" />
                    </div>
                    <div>
                      <label style="display: block; font-size: 11px; font-weight: 600; margin-bottom: 3px;">Late Tolerance (ms)</label>
                      <input type="number" id="rd-opt-late-tolerance" class="text-input" style="width: 100%; font-size: 12px;" value="1000" oninput="updateRuleDesignerPreview()" />
                    </div>
                  </div>
                </div>

                <!-- Resilience & Stream Flags -->
                <div style="display: flex; flex-direction: column; gap: 8px;">
                  <label style="display: flex; align-items: center; gap: 8px; font-size: 12px; cursor: pointer;">
                    <input type="checkbox" id="rd-opt-send-meta" onchange="updateRuleDesignerPreview()" />
                    <span><strong>Attach Metadata (__meta__)</strong> to sink payloads (topic, client_id, timestamp)</span>
                  </label>
                  <label style="display: flex; align-items: center; gap: 8px; font-size: 12px; cursor: pointer;">
                    <input type="checkbox" id="rd-opt-send-error" onchange="updateRuleDesignerPreview()" />
                    <span><strong>Forward Runtime Errors to Sinks</strong> (routes codec/SQL eval failures down the graph)</span>
                  </label>
                  <label style="display: flex; align-items: center; gap: 8px; font-size: 12px; cursor: pointer;">
                    <input type="checkbox" id="rd-opt-triggered" onchange="updateRuleDesignerPreview()" />
                    <span><strong>Deploy in Paused State</strong> (rule is created but not started until manually triggered)</span>
                  </label>
                </div>
              </div>

            </div>

            <!-- Right Column: Live Pipeline Preview & Engine Preflight -->
            <div class="designer-preview-col">
              <div class="designer-preview-header">
                <span style="font-weight: 600; display: flex; align-items: center; gap: 6px;">
                  <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path><polyline points="14 2 14 8 20 8"></polyline><line x1="16" y1="13" x2="8" y2="13"></line><line x1="16" y1="17" x2="8" y2="17"></line><polyline points="10 9 9 9 8 9"></polyline></svg>
                  Pipeline JSON Preview
                </span>
                <div style="display: flex; align-items: center; gap: 8px;">
                  <label style="display: flex; align-items: center; gap: 4px; font-size: 11px; cursor: pointer; color: #94a3b8;">
                    <input type="checkbox" id="rd-mask-secrets" checked onchange="updateRuleDesignerPreview()" />
                    <span>Mask Secrets</span>
                  </label>
                  <button type="button" class="btn btn-sm" style="font-size: 11px; padding: 2px 8px; background: #1e293b; color: #94a3b8; border-color: #334155;" onclick="copyRuleDesignerJson()">Copy</button>
                </div>
              </div>

              <pre id="rd-preview-json" class="designer-preview-body" style="margin: 0;"></pre>

              <div class="designer-preview-footer">
                <button type="button" id="rd-validate-btn" class="btn btn-sm" style="background: #1e293b; color: #38bdf8; border-color: #0284c7; width: 100%; font-weight: 600;" onclick="validateRuleDesignerWithEngine()">
                  &#x2714; Validate with Engine Preflight
                </button>
                <div id="rd-validation-msg" style="font-size: 11px; display: none;"></div>
              </div>
            </div>

          </div>
        </div>

        <!-- Modal Footer Navigation -->
        <div class="fleet-modal-footer" style="padding: 12px 20px; display: flex; justify-content: space-between; align-items: center;">
          <button type="button" class="btn btn-sm" onclick="closeRuleDesignerModal()">Cancel</button>
          <div style="display: flex; gap: 8px;">
            <button type="button" id="rd-prev-btn" class="btn btn-sm" onclick="stepRuleDesigner(-1)" style="display: none;">&larr; Back</button>
            <button type="button" id="rd-next-btn" class="btn btn-sm btn-primary" onclick="stepRuleDesigner(1)">Next Step &rarr;</button>
            <button type="button" id="rd-deploy-btn" class="btn btn-sm btn-primary" onclick="submitRuleDesignerDeployment()" style="background: #16a34a; border-color: #15803d; display: none;">
              Deploy Rule Pipeline &#x1f680;
            </button>
          </div>
        </div>
      </div>
    </div>

    <!-- Visual Stream & Table Schema Builder Modal -->
    <div id="stream-designer-modal" class="fleet-modal-overlay" style="display: none; z-index: 105;">
      <div class="fleet-modal-dialog" style="max-width: 920px; width: 90vw; height: 85vh; max-height: 800px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">📋</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="stream-designer-modal-title">Visual Schema &amp; Topology Builder</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Define streams and lookup tables with strongly-typed field schemas or schemaless ingestion</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeStreamDesignerModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="flex: 1; overflow-y: auto; padding: 18px 20px; display: flex; flex-direction: column; gap: 16px;">
          
          <!-- Zero-Knowledge IoT Templates Bar -->
          <div style="background: var(--bg-subtle); padding: 8px 12px; border-radius: 6px; border: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;">
            <div style="display: flex; align-items: center; gap: 8px;">
              <span style="font-size: 11px; font-weight: 600; color: var(--text-secondary);">⚡ Zero-Knowledge IoT Templates:</span>
              <select id="sd-template-select" class="select-input" style="font-size: 11px; padding: 3px 8px;" onchange="loadStreamTemplate(this.value)">
                <option value="">-- Choose Template Preset --</option>
                <option value="machinery">Industrial Machinery (Temp, RPM, Vibration, Status)</option>
                <option value="energy">Power &amp; Energy Meter (Voltage, Current, Power, kWh)</option>
                <option value="vehicle">Fleet GPS Tracker (Lat, Long, Speed, Battery)</option>
                <option value="air_quality">Air Quality (PM2.5, PM10, CO2, Humidity)</option>
              </select>
            </div>
            <div style="display: flex; gap: 6px;">
              <a href="javascript:void(0)" onclick="openDoc('guide/sources/overview')" class="doc-pill-link">📖 Connectors</a>
              <a href="javascript:void(0)" onclick="openDoc('guide/serialization/serialization')" class="doc-pill-link">📖 Formats</a>
              <a href="javascript:void(0)" onclick="openDoc('sqls/data_types')" class="doc-pill-link">📖 Data Types</a>
            </div>
          </div>

          <!-- Kind Selector: Stream vs Table -->
          <div style="display: flex; align-items: center; justify-content: space-between; background: var(--bg-subtle); padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border);">
            <div style="display: flex; align-items: center; gap: 10px;">
              <span style="font-size: 12px; font-weight: 600;">Catalog Topology Kind:</span>
              <div style="display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden;">
                <button type="button" id="sd-kind-stream" class="btn btn-sm" style="border:none; border-radius:0; background: var(--accent); color: #fff; font-size: 12px;" onclick="setStreamDesignerKind('stream')">Stream (Real-Time Ingestion)</button>
                <button type="button" id="sd-kind-table" class="btn btn-sm" style="border:none; border-radius:0; background: var(--bg-surface); color: var(--text-secondary); font-size: 12px;" onclick="setStreamDesignerKind('table')">Table (Lookup / Dimension Scan)</button>
              </div>
            </div>
            <label style="display: flex; align-items: center; gap: 6px; font-size: 12px; cursor: pointer;">
              <input type="checkbox" id="sd-schemaless-toggle" onchange="toggleSchemalessMode()" />
              <span style="font-weight: 600;">Schemaless (Dynamic Ingestion)</span>
            </label>
          </div>

          <!-- Top Config Grid -->
          <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 14px;">
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;" id="sd-name-label">Stream Name <span style="color:var(--rose-dot)">*</span></label>
              <input type="text" id="sd-name" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. factory_telemetry" oninput="updateStreamDesignerDdl()" />
            </div>

            <div>
              <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">
                <label style="font-size: 12px; font-weight: 600;">Connector Type <span style="color:var(--rose-dot)">*</span></label>
                <a href="javascript:void(0)" onclick="openDoc('guide/sources/overview')" class="doc-pill-link">📖 All Connectors</a>
              </div>
              <select id="sd-connector-type" class="select-input" style="width: 100%;" onchange="onStreamConnectorChange()">
                <option value="mqtt">MQTT (v3.1.1 / v5.0 Broker)</option>
                <option value="http">HTTP / REST Pull Source</option>
                <option value="kafka">Apache Kafka Broker</option>
                <option value="file">File / CSV / Parquet Stream</option>
                <option value="memory">In-Memory Bus (rekuiper internal)</option>
                <option value="edgex">EdgeX Foundry MessageBus</option>
                <option value="modbus">Modbus TCP / RTU PLC</option>
                <option value="opcua">OPC-UA Industrial Server</option>
                <option value="simulator">Synthetic Simulator</option>
                <option value="neuron">Neuron IIoT Gateway</option>
              </select>
            </div>
          </div>

          <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 14px;">
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Datasource / Topic <span style="color:var(--rose-dot)">*</span></label>
              <input type="text" id="sd-datasource" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. factory/+/sensors or /data" value="factory/+/sensors" oninput="updateStreamDesignerDdl()" />
            </div>

            <div>
              <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">
                <label style="font-size: 12px; font-weight: 600;">Stream Payload Format</label>
                <a href="javascript:void(0)" onclick="openDoc('guide/serialization/serialization')" class="doc-pill-link">📖 Format Specs</a>
              </div>
              <select id="sd-format" class="select-input" style="width: 100%;" onchange="onStreamFormatChange()">
                <option value="json">JSON (Standard Object / Array)</option>
                <option value="binary">Binary (Raw byte array)</option>
                <option value="delimited">Delimited / CSV</option>
                <option value="protobuf">Protobuf</option>
                <option value="custom">Custom Extensible Format</option>
              </select>
            </div>
          </div>

          <!-- Protobuf & Custom Schema Selection Row -->
          <div id="sd-schema-options-row" style="display: none; background: var(--bg-subtle); padding: 10px 14px; border-radius: 6px; border: 1px solid var(--border);">
            <div style="display: grid; grid-template-columns: 1fr 1fr auto; gap: 12px; align-items: flex-end;">
              <div>
                <label style="display: block; font-size: 11px; font-weight: 600; margin-bottom: 4px;">Registered Schema ID <span style="color:var(--rose-dot)">*</span></label>
                <select id="sd-schema-select" class="select-input" style="width: 100%; font-family: var(--font-mono);" onchange="onStreamSchemaSelectChange()">
                  <option value="">-- Select Schema --</option>
                </select>
              </div>
              <div id="sd-msg-type-wrapper">
                <label style="display: block; font-size: 11px; font-weight: 600; margin-bottom: 4px;">Proto3 Message Type <span style="color:var(--rose-dot)">*</span></label>
                <select id="sd-message-type-select" class="select-input" style="width: 100%; font-family: var(--font-mono);" onchange="updateStreamDesignerDdl()">
                  <option value="">-- Select Message Type --</option>
                </select>
              </div>
              <div style="display: flex; gap: 6px;">
                <button type="button" class="btn btn-sm" onclick="openNewSchemaModal()" title="Create New Schema">
                  + New Schema
                </button>
                <button type="button" id="sd-autofill-btn" class="btn btn-sm btn-primary" onclick="autofillStreamFieldsFromSchema()" title="Autofill typed stream fields from the selected Protobuf message definition" style="display: none;">
                  Autofill Fields 🪄
                </button>
              </div>
            </div>
          </div>

          <!-- Delimited / CSV Options Row -->
          <div id="sd-delimited-options-row" style="display: none; background: var(--bg-subtle); padding: 10px 14px; border-radius: 6px; border: 1px solid var(--border);">
            <div style="display: grid; grid-template-columns: 140px 1fr; gap: 12px; align-items: flex-end;">
              <div>
                <label style="display: block; font-size: 11px; font-weight: 600; margin-bottom: 4px;">Delimiter Char</label>
                <input type="text" id="sd-delimiter-input" class="text-input" style="width: 100%; font-family: var(--font-mono);" value="," maxlength="4" oninput="updateStreamDesignerDdl()" />
              </div>
              <div style="font-size: 11px; color: var(--text-muted); padding-bottom: 6px;">
                Separator for CSV / TSV / custom delimited stream ingestion (e.g. <code>,</code>, <code>;</code>, <code>\t</code>).
              </div>
            </div>
          </div>

          <!-- ConfKey Selector with inline creation button and Advanced Properties -->
          <div style="display: grid; grid-template-columns: 1fr auto auto; gap: 10px; align-items: flex-end;">
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Configuration Key (ConfKey)</label>
              <select id="sd-confkey-select" class="select-input" style="width: 100%;" onchange="updateStreamDesignerDdl()">
                <option value="">Default (Global / inline defaults)</option>
              </select>
            </div>
            <button type="button" class="btn btn-sm" onclick="openInlineConfKeyModal(document.getElementById('sd-connector-type').value)" style="white-space: nowrap;">
              + New ConfKey
            </button>
            <button type="button" class="btn btn-sm" onclick="openStreamAdvancedProperties()" style="white-space: nowrap;" title="Configure connector advanced properties">
              ⚙ Advanced Properties
            </button>
          </div>

          <!-- Nested Fields Table -->
          <div id="sd-fields-section" style="display: flex; flex-direction: column; gap: 8px;">
            <div style="display: flex; justify-content: space-between; align-items: center;">
              <div>
                <strong style="font-size: 12px;">Schema Fields Definition</strong>
                <span style="font-size: 11px; color: var(--text-muted); margin-left: 6px;">Define typed attributes for validation and optimized query evaluation</span>
              </div>
              <div style="display: flex; gap: 8px;">
                <button type="button" class="btn btn-sm" onclick="toggleInferJsonBox()" style="background: #eff6ff; border-color: #bfdbfe; color: #1e40af; font-weight: 600;">
                  ✨ Infer Schema from Sample JSON
                </button>
                <button type="button" class="btn btn-sm btn-primary" onclick="addStreamFieldRow()">+ Add Field</button>
              </div>
            </div>

            <!-- Inline Sample JSON Infer Box -->
            <div id="sd-infer-json-box" style="display: none; background: #fafbfc; border: 1px solid #bfdbfe; border-radius: 6px; padding: 12px; flex-direction: column; gap: 8px;">
              <div style="display: flex; justify-content: space-between; align-items: center;">
                <span style="font-size: 12px; font-weight: 600; color: #1e40af;">Paste Sample JSON Message to Infer Schema:</span>
                <span style="font-size: 11px; color: var(--text-muted);">Attributes and data types will be automatically populated</span>
              </div>
              <textarea id="sd-sample-json-input" class="text-input" style="width: 100%; height: 75px; font-family: var(--font-mono); font-size: 12px;" placeholder='{"device_id": "sensor_01", "temperature": 75.4, "pressure": 101.3, "active": true}'></textarea>
              <div style="display: flex; justify-content: flex-end; gap: 8px;">
                <button type="button" class="btn btn-sm" onclick="toggleInferJsonBox()">Cancel</button>
                <button type="button" class="btn btn-sm btn-primary" onclick="inferStreamFieldsFromJson()">Infer &amp; Populate Fields 🪄</button>
              </div>
            </div>

            <div style="border: 1px solid var(--border); border-radius: 6px; overflow: hidden;">
              <table class="fields-grid-table">
                <thead>
                  <tr>
                    <th style="width: 35%;">Field Name</th>
                    <th style="width: 35%;">Data Type</th>
                    <th style="width: 20%;">Optional / Nullable</th>
                    <th style="width: 10%; text-align: center;">Action</th>
                  </tr>
                </thead>
                <tbody id="sd-fields-tbody">
                  <!-- Generated dynamically -->
                </tbody>
              </table>
            </div>
          </div>

          <!-- Live Generated DDL SQL Preview -->
          <div style="display: flex; flex-direction: column; gap: 6px;">
            <div style="display: flex; justify-content: space-between; align-items: center;">
              <span style="font-size: 12px; font-weight: 600; color: var(--text-secondary);">Generated DDL SQL Preview</span>
              <button type="button" class="btn btn-sm" style="font-size: 11px; padding: 2px 8px;" onclick="copyStreamDesignerDdl()">Copy SQL</button>
            </div>
            <pre id="sd-ddl-preview" style="background: #090e17; border: 1px solid #1e293b; color: #38bdf8; font-family: var(--font-mono); font-size: 12px; padding: 12px 14px; border-radius: 6px; margin: 0; line-height: 1.5; white-space: pre-wrap; overflow-x: auto;"></pre>
          </div>

        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; display: flex; justify-content: space-between; align-items: center;">
          <button type="button" class="btn btn-sm" onclick="closeStreamDesignerModal()">Cancel</button>
          <button type="button" id="sd-submit-btn" class="btn btn-sm btn-primary" onclick="submitStreamDesigner()">
            Create Stream
          </button>
        </div>
      </div>
    </div>

    <!-- Inline ConfKey Modal -->
    <div id="inline-confkey-modal" class="fleet-modal-overlay" style="display: none; z-index: 110;">
      <div class="fleet-modal-dialog" style="max-width: 480px;">
        <div class="fleet-modal-header">
          <strong style="font-size: 15px;">New Connector Configuration Key</strong>
          <button class="btn btn-sm" onclick="closeInlineConfKeyModal()">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="display: flex; flex-direction: column; gap: 14px;">
          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Connector Type</label>
            <input type="text" id="inline-ck-type" class="text-input" style="width: 100%;" readonly />
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Configuration Key Name <span style="color:var(--rose-dot)">*</span></label>
            <input type="text" id="inline-ck-name" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. factory_broker" />
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Configuration Properties (JSON) <span style="color:var(--rose-dot)">*</span></label>
            <textarea id="inline-ck-json" class="text-input" style="width: 100%; height: 160px; font-family: var(--font-mono); font-size: 12px; resize: vertical;" placeholder='{\n  "server": "tcp://127.0.0.1:1883",\n  "username": "admin",\n  "password": "secret"\n}'></textarea>
          </div>
        </div>

        <div class="fleet-modal-footer">
          <button type="button" class="btn btn-sm" onclick="closeInlineConfKeyModal()">Cancel</button>
          <button type="button" class="btn btn-sm btn-primary" onclick="submitInlineConfKey()">Save &amp; Apply</button>
        </div>
      </div>
    </div>

    <!-- Shared Connection Pool Modal -->
    <div id="connection-modal" class="fleet-modal-overlay" style="display: none; z-index: 106;">
      <div class="fleet-modal-dialog" style="max-width: 860px; width: 92vw; height: 84vh; max-height: 760px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 12px;">
            <span style="font-size: 18px;">🔌</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="conn-modal-title">New Shared Connection</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Manage pooled connector endpoints, credentials &amp; socket parameters</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeConnectionModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="flex: 1; overflow-y: auto; padding: 18px 20px; display: flex; flex-direction: column; gap: 14px;">
          <!-- Top Row: Connection ID & Connector Type -->
          <div style="display: grid; grid-template-columns: 1.2fr 1fr; gap: 14px;">
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Connection ID <span style="color:var(--rose-dot)">*</span></label>
              <input type="text" id="conn-modal-id" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. factory_mqtt_broker" />
            </div>
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Connector Type <span style="color:var(--rose-dot)">*</span></label>
              <select id="conn-modal-type" class="select-input" style="width: 100%;" onchange="onConnectionTypeChange()">
                <option value="mqtt">MQTT Broker (v3.1.1 / v5.0)</option>
                <option value="edgex">EdgeX Foundry MessageBus</option>
                <option value="kafka">Apache Kafka Cluster</option>
                <option value="http">HTTP / REST Service</option>
                <option value="sql">SQL Relational Database</option>
                <option value="modbus">Modbus TCP / RTU PLC</option>
                <option value="opcua">OPC-UA Server</option>
                <option value="redis">Redis Server</option>
                <option value="zmq">ZeroMQ Socket</option>
                <option value="neuron">Neuron Industrial Gateway</option>
              </select>
            </div>
          </div>

          <!-- Dual Mode Toggle Bar -->
          <div class="prop-dual-toggle-bar">
            <span style="font-size: 12px; font-weight: 600; color: var(--text-secondary);" id="conn-props-header-label">
              Connection Properties (Schema-Validated)
            </span>
            <div style="display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden;">
              <button type="button" id="conn-btn-mode-form" class="btn btn-sm" style="border:none; border-radius:0; background: var(--accent); color: #fff; font-size: 11px;" onclick="setConnectionEditMode('form')">Visual Form</button>
              <button type="button" id="conn-btn-mode-json" class="btn btn-sm" style="border:none; border-radius:0; background: var(--bg-surface); color: var(--text-secondary); font-size: 11px;" onclick="setConnectionEditMode('json')">Raw JSON</button>
            </div>
          </div>

          <!-- Dynamic PropertyForm Container -->
          <div id="conn-form-container" style="display: block;">
            <div id="conn-properties-target"></div>
          </div>

          <!-- Raw JSON Editor Container -->
          <div id="conn-json-container" style="display: none; flex-direction: column; gap: 8px;">
            <textarea id="conn-raw-json" class="text-input" style="width: 100%; height: 240px; font-family: var(--font-mono); font-size: 12px; line-height: 1.4; resize: vertical;" oninput="onConnectionRawJsonInput()"></textarea>
            <div id="conn-json-error" style="display: none; color: var(--rose-text); font-size: 11px; font-family: var(--font-mono); background: #fff1f2; padding: 6px 10px; border-radius: 4px; border: 1px solid #fecdd3;"></div>
          </div>

          <!-- Preflight Test Banner -->
          <div id="conn-test-banner" style="display: none; padding: 10px 14px; border-radius: 6px; font-size: 12px; align-items: center; justify-content: space-between;">
            <div style="display: flex; align-items: center; gap: 8px;" id="conn-test-msg"></div>
            <button class="btn btn-xs" onclick="document.getElementById('conn-test-banner').style.display='none'">Dismiss</button>
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; display: flex; justify-content: space-between; align-items: center;">
          <div style="display: flex; gap: 8px;">
            <button type="button" class="btn btn-sm" onclick="testConnectionPreflightFromModal()" id="conn-test-btn">
              <span>⚡ Test Preflight</span>
            </button>
          </div>
          <div style="display: flex; gap: 8px;">
            <button type="button" class="btn btn-sm" onclick="closeConnectionModal()">Cancel</button>
            <button type="button" class="btn btn-sm btn-primary" onclick="submitConnectionModal()" id="conn-save-btn">
              Save Connection
            </button>
          </div>
        </div>
      </div>
    </div>

    <!-- ConfKeys Manager Modal -->
    <div id="confkeys-manager-modal" class="fleet-modal-overlay" style="display: none; z-index: 106;">
      <div class="fleet-modal-dialog" style="max-width: 980px; width: 94vw; height: 86vh; max-height: 800px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 12px;">
            <span style="font-size: 18px;">🔑</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);">Connector Configuration Keys Hub</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Manage and test reusable configuration key profiles across sources &amp; sinks</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeConfKeysManagerModal()" title="Close">&#x2715;</button>
        </div>

        <!-- Connector Type Toolbar -->
        <div style="padding: 10px 20px; background: var(--bg-subtle); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 12px;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <label style="font-size: 12px; font-weight: 600;">Connector:</label>
            <select id="ck-connector-select" class="select-input" style="font-size: 12px; font-weight: 600; padding: 4px 10px;" onchange="onConfKeysConnectorChange(this.value)">
              <option value="mqtt">MQTT (v3.1.1 / v5.0)</option>
              <option value="http">HTTP / REST</option>
              <option value="kafka">Apache Kafka</option>
              <option value="file">File Stream</option>
              <option value="modbus">Modbus TCP/RTU</option>
              <option value="opcua">OPC-UA</option>
              <option value="edgex">EdgeX Foundry</option>
              <option value="neuron">Neuron Gateway</option>
              <option value="redis">Redis</option>
              <option value="sql">SQL Database</option>
              <option value="zmq">ZeroMQ</option>
            </select>
          </div>
          <div style="font-size: 11px; color: var(--text-muted);">
            Endpoints: <code style="font-family:var(--font-mono); font-size: 11px;">/metadata/sources/{type}/confKeys</code> &amp; <code style="font-family:var(--font-mono); font-size: 11px;">/configs/sources/{type}</code>
          </div>
        </div>

        <div class="fleet-modal-body" style="flex: 1; overflow: hidden; padding: 16px 20px;">
          <div class="confkeys-master-detail">
            <!-- Left Pane: ConfKey List -->
            <div class="confkeys-sidebar">
              <div style="display: flex; gap: 6px;">
                <input type="text" id="ck-search-input" class="text-input" style="flex: 1; font-size: 11px; padding: 4px 8px;" placeholder="Filter keys..." oninput="filterConfKeysList()" />
                <button type="button" class="btn btn-sm btn-primary" style="font-size: 11px; padding: 4px 8px;" onclick="createNewConfKey()" title="Add new configuration key">+ New</button>
              </div>

              <div class="confkeys-list" id="ck-items-list">
                <div class="empty-state" style="padding: 20px 8px; font-size: 11px;">No confKeys found.</div>
              </div>
            </div>

            <!-- Right Pane: Property Form & Actions -->
            <div style="flex: 1; display: flex; flex-direction: column; gap: 12px; overflow-y: auto; padding-left: 6px;">
              <div style="display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--border); padding-bottom: 10px;">
                <div style="flex: 1; margin-right: 12px;">
                  <label style="display: block; font-size: 11px; font-weight: 600; margin-bottom: 3px;">Configuration Key Name <span style="color:var(--rose-dot)">*</span></label>
                  <input type="text" id="ck-key-name" class="text-input" style="width: 100%; font-family: var(--font-mono); font-size: 12px;" placeholder="e.g. factory_broker" />
                </div>
                <div style="display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; margin-top: 14px;">
                  <button type="button" id="ck-btn-mode-form" class="btn btn-sm" style="border:none; border-radius:0; background: var(--accent); color: #fff; font-size: 11px;" onclick="setConfKeyEditMode('form')">Visual Form</button>
                  <button type="button" id="ck-btn-mode-json" class="btn btn-sm" style="border:none; border-radius:0; background: var(--bg-surface); color: var(--text-secondary); font-size: 11px;" onclick="setConfKeyEditMode('json')">Raw JSON</button>
                </div>
              </div>

              <!-- Form Container -->
              <div id="ck-form-container">
                <div id="ck-properties-target"></div>
              </div>

              <!-- Raw JSON Container -->
              <div id="ck-json-container" style="display: none; flex-direction: column; gap: 8px;">
                <textarea id="ck-raw-json" class="text-input" style="width: 100%; height: 260px; font-family: var(--font-mono); font-size: 12px; resize: vertical;" oninput="onConfKeyRawJsonInput()"></textarea>
                <div id="ck-json-error" style="display: none; color: var(--rose-text); font-size: 11px; font-family: var(--font-mono); background: #fff1f2; padding: 6px 10px; border-radius: 4px; border: 1px solid #fecdd3;"></div>
              </div>

              <!-- Preflight status banner -->
              <div id="ck-test-banner" style="display: none; padding: 8px 12px; border-radius: 6px; font-size: 12px; align-items: center; justify-content: space-between;">
                <div style="display: flex; align-items: center; gap: 8px;" id="ck-test-msg"></div>
                <button class="btn btn-xs" onclick="document.getElementById('ck-test-banner').style.display='none'">Dismiss</button>
              </div>

              <!-- Bottom Action Bar -->
              <div style="display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border);">
                <button type="button" class="btn btn-sm" onclick="testConfKeyPreflight()">
                  <span>⚡ Test Preflight</span>
                </button>
                <div style="display: flex; gap: 8px;">
                  <button type="button" id="ck-delete-btn" class="btn btn-sm" style="color:var(--rose-text);" onclick="deleteSelectedConfKey()">Delete Key</button>
                  <button type="button" class="btn btn-sm btn-primary" onclick="submitCurrentConfKey()">Save ConfKey 💾</button>
                </div>
              </div>
            </div>
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 10px 20px;">
          <button type="button" class="btn btn-sm" onclick="closeConfKeysManagerModal()">Close</button>
        </div>
      </div>
    </div>

    <!-- Dynamic Connector Advanced Properties Modal -->
    <div id="dynamic-properties-modal" class="fleet-modal-overlay" style="display: none; z-index: 108;">
      <div class="fleet-modal-dialog" style="max-width: 800px; width: 90vw; height: 78vh; max-height: 720px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">⚙</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="dyn-modal-title">Connector Advanced Properties</strong>
              <div style="font-size: 11px; color: var(--text-muted);" id="dyn-modal-subtitle">Fine-tune protocol parameters, TLS security &amp; buffers</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeDynamicPropertiesModal()" title="Close">&#x2715;</button>
        </div>

        <!-- Mode Toggle Bar -->
        <div style="padding: 8px 20px; background: var(--bg-subtle); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between;">
          <span style="font-size: 12px; font-weight: 600;" id="dyn-connector-badge">Connector: MQTT</span>
          <div style="display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden;">
            <button type="button" id="dyn-btn-mode-form" class="btn btn-sm" style="border:none; border-radius:0; background: var(--accent); color: #fff; font-size: 11px;" onclick="setDynModalMode('form')">Visual Form</button>
            <button type="button" id="dyn-btn-mode-json" class="btn btn-sm" style="border:none; border-radius:0; background: var(--bg-surface); color: var(--text-secondary); font-size: 11px;" onclick="setDynModalMode('json')">Raw JSON</button>
          </div>
        </div>

        <div class="fleet-modal-body" style="flex: 1; overflow-y: auto; padding: 18px 20px;">
          <div id="dyn-form-container">
            <div id="dyn-properties-target"></div>
          </div>
          <div id="dyn-json-container" style="display: none; flex-direction: column; gap: 8px;">
            <textarea id="dyn-raw-json" class="text-input" style="width: 100%; height: 280px; font-family: var(--font-mono); font-size: 12px; resize: vertical;" oninput="onDynRawJsonInput()"></textarea>
            <div id="dyn-json-error" style="display: none; color: var(--rose-text); font-size: 11px; font-family: var(--font-mono); background: #fff1f2; padding: 6px 10px; border-radius: 4px; border: 1px solid #fecdd3;"></div>
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; display: flex; justify-content: flex-end; gap: 8px;">
          <button type="button" class="btn btn-sm" onclick="closeDynamicPropertiesModal()">Cancel</button>
          <button type="button" class="btn btn-sm btn-primary" onclick="applyDynamicPropertiesModal()">Apply Properties</button>
        </div>
      </div>
    </div>

    <!-- Schema Registry & Serialization Hub Editor Modal -->
    <div id="schema-editor-modal" class="fleet-modal-overlay" style="display: none; z-index: 107;">
      <div class="fleet-modal-dialog" style="max-width: 980px; width: 94vw; height: 86vh; max-height: 820px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 12px;">
            <span style="font-size: 20px;">📜</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="schema-modal-title">Schema Registry &amp; Serialization Hub</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Manage Proto3 contracts, custom binary decoders, and message serialization schemas</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeSchemaModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="flex: 1; overflow-y: auto; padding: 18px 20px; display: flex; flex-direction: column; gap: 14px;">
          <!-- Top Row: Schema Name, Schema Format, Preset Template -->
          <div style="display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 14px; align-items: flex-end;">
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Schema Name / ID <span style="color:var(--rose-dot)">*</span></label>
              <input type="text" id="schema-modal-name" class="text-input" style="width: 100%; font-family: var(--font-mono);" placeholder="e.g. factory_telemetry" />
            </div>
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Serialization Format <span style="color:var(--rose-dot)">*</span></label>
              <select id="schema-modal-kind" class="select-input" style="width: 100%; font-weight: 600;" onchange="onSchemaModalKindChange()">
                <option value="protobuf">Protobuf 3 (Google Protocol Buffers)</option>
                <option value="custom">Custom Binary Codec / Shared Lib</option>
                <option value="json">JSON Schema (Draft-07 Object)</option>
                <option value="delimited">Delimited / CSV Field Spec</option>
              </select>
            </div>
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Load Snippet Template</label>
              <select id="schema-template-select" class="select-input" style="width: 100%;" onchange="loadSchemaTemplate(this.value)">
                <option value="">-- Select Template --</option>
                <option value="proto_sensor">Protobuf: IIoT Sensor Telemetry</option>
                <option value="proto_alarm">Protobuf: Machine State &amp; Alarms</option>
                <option value="proto_opcua">Protobuf: OPC-UA Tag Bundle</option>
                <option value="custom_modbus">Custom: Modbus RTU Register Map</option>
                <option value="json_metric">JSON Schema: IIoT Metric Event</option>
                <option value="delimited_csv">Delimited: CSV Machine Log Spec</option>
              </select>
            </div>
          </div>

          <!-- Split Workspace: Code Editor (Left) & Contract Inspector / AST Symbols (Right) -->
          <div style="display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 14px; flex: 1; min-height: 380px;">
            <!-- Left: Monospace Code Editor -->
            <div style="display: flex; flex-direction: column; gap: 6px;">
              <div style="display: flex; justify-content: space-between; align-items: center;">
                <span style="font-size: 12px; font-weight: 600; color: var(--text-secondary);" id="schema-editor-label">Schema Definition (.proto / code)</span>
                <div style="display: flex; gap: 6px;">
                  <input type="file" id="schema-file-upload-input" style="display: none;" accept=".proto,.json,.txt" onchange="handleSchemaFileUpload(event)" />
                  <button type="button" class="btn btn-sm" onclick="document.getElementById('schema-file-upload-input').click()" title="Upload file from disk">
                    📁 Upload File
                  </button>
                  <button type="button" class="btn btn-sm" onclick="formatSchemaContent()" title="Format Code">
                    🪄 Format
                  </button>
                </div>
              </div>
              <textarea id="schema-modal-content" class="text-input" style="flex: 1; width: 100%; min-height: 360px; font-family: var(--font-mono); font-size: 12px; line-height: 1.5; background: #090e17; color: #38bdf8; border: 1px solid #1e293b; border-radius: 6px; padding: 12px 14px; tab-size: 2; resize: none; white-space: pre;" placeholder="Enter schema definition..." oninput="onSchemaContentInput()"></textarea>
            </div>

            <!-- Right: Real-time Contract Inspector & Symbols AST -->
            <div style="display: flex; flex-direction: column; gap: 10px; background: var(--bg-surface); border: 1px solid var(--border); border-radius: 8px; padding: 14px; overflow-y: auto;">
              <div style="display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); padding-bottom: 8px;">
                <span style="font-size: 12px; font-weight: 700; color: var(--text-primary);">Contract Symbols &amp; AST</span>
                <button type="button" class="btn btn-sm" onclick="validateSchemaModalSyntax()" style="font-size: 11px; padding: 2px 8px;">
                  Validate Syntax ⚡
                </button>
              </div>

              <!-- Preflight Status Badge -->
              <div id="schema-ast-status-box" style="padding: 8px 12px; border-radius: 6px; background: var(--bg-subtle); border: 1px solid var(--border); font-size: 11px;">
                <span id="schema-ast-status-text" style="color: var(--text-muted);">Ready to validate</span>
              </div>

              <!-- Package & Syntax Info -->
              <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 8px;">
                <div>
                  <span style="font-size: 10px; font-weight: 700; color: var(--text-muted); text-transform: uppercase;">Syntax Standard</span>
                  <div id="schema-ast-syntax" style="font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: #8b5cf6;">proto3</div>
                </div>
                <div>
                  <span style="font-size: 10px; font-weight: 700; color: var(--text-muted); text-transform: uppercase;">Package Identifier</span>
                  <div id="schema-ast-package" style="font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--text-secondary);">(none)</div>
                </div>
              </div>

              <!-- Extracted Messages & Fields -->
              <div style="display: flex; flex-direction: column; gap: 6px;">
                <span style="font-size: 11px; font-weight: 700; color: var(--text-secondary);">Extracted Messages (<span id="schema-ast-msg-count">0</span>)</span>
                <div id="schema-ast-messages-container" style="display: flex; flex-direction: column; gap: 8px;">
                  <div style="font-size: 11px; color: var(--text-muted);">No messages detected yet.</div>
                </div>
              </div>

              <!-- Extracted Enums -->
              <div style="display: flex; flex-direction: column; gap: 6px;" id="schema-ast-enums-wrapper">
                <span style="font-size: 11px; font-weight: 700; color: var(--text-secondary);">Enums (<span id="schema-ast-enum-count">0</span>)</span>
                <div id="schema-ast-enums-container" style="display: flex; flex-wrap: wrap; gap: 4px;">
                  <div style="font-size: 11px; color: var(--text-muted);">No enums defined.</div>
                </div>
              </div>
            </div>
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; background: #fafbfc; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center;">
          <div id="schema-modal-footer-msg" style="font-size: 12px; color: var(--text-muted);">Single-binary zero-dependency serialization hub</div>
          <div style="display: flex; gap: 8px;">
            <button type="button" class="btn btn-sm" onclick="closeSchemaModal()">Cancel</button>
            <button type="button" class="btn btn-sm btn-primary" onclick="submitSchemaModal()">Save &amp; Register Schema 💾</button>
          </div>
        </div>
      </div>
    </div>

    <!-- Schema Inspector Modal -->
    <div id="schema-inspector-modal" class="fleet-modal-overlay" style="display: none; z-index: 108;">
      <div class="fleet-modal-dialog" style="max-width: 820px; width: 90vw; height: 78vh; max-height: 720px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">🔍</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="schema-inspect-title">Schema Inspector</strong>
              <div style="font-size: 11px; color: var(--text-muted);" id="schema-inspect-subtitle">Contract details, parsed types &amp; pipeline references</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeSchemaInspectorModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="flex: 1; overflow-y: auto; padding: 18px 20px; display: flex; flex-direction: column; gap: 14px;">
          <!-- Metadata Bar -->
          <div style="display: flex; align-items: center; justify-content: space-between; background: var(--bg-subtle); padding: 10px 14px; border-radius: 6px; border: 1px solid var(--border); flex-wrap: wrap; gap: 8px;">
            <div style="display: flex; align-items: center; gap: 12px;">
              <span id="schema-inspect-kind-badge" class="badge badge-slate" style="text-transform: uppercase; font-weight: 700;">PROTOBUF</span>
              <span id="schema-inspect-ref-badge" class="badge badge-emerald">0 Active References</span>
            </div>
            <div style="display: flex; gap: 6px;">
              <button type="button" class="btn btn-sm" onclick="copySchemaInspectContent()">Copy Content 📋</button>
              <button type="button" class="btn btn-sm btn-primary" id="schema-inspect-edit-btn" onclick="editFromSchemaInspector()">Edit Schema ✏</button>
            </div>
          </div>

          <!-- Parsed Types Bar -->
          <div id="schema-inspect-types-box" style="display: flex; flex-direction: column; gap: 6px;">
            <span style="font-size: 11px; font-weight: 700; color: var(--text-secondary);">Declared Message Types / Symbols</span>
            <div id="schema-inspect-types-list" style="display: flex; flex-wrap: wrap; gap: 6px;"></div>
          </div>

          <!-- Code View -->
          <div style="display: flex; flex-direction: column; gap: 6px; flex: 1;">
            <span style="font-size: 11px; font-weight: 700; color: var(--text-secondary);">Raw Schema Definition</span>
            <pre id="schema-inspect-code" style="flex: 1; min-height: 240px; background: #090e17; color: #38bdf8; font-family: var(--font-mono); font-size: 12px; padding: 12px 14px; border-radius: 6px; border: 1px solid #1e293b; margin: 0; line-height: 1.5; white-space: pre-wrap; overflow-x: auto;"></pre>
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; display: flex; justify-content: flex-end;">
          <button type="button" class="btn btn-sm" onclick="closeSchemaInspectorModal()">Close</button>
        </div>
      </div>
    </div>

    <!-- Phase 4: Plugin Install Modal -->
    <div id="plugin-install-modal" class="fleet-modal-overlay" style="display: none; z-index: 110;">
      <div class="fleet-modal-dialog" style="max-width: 600px; width: 90vw;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">🔌</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);">Register Plugin / Codec</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Install Wasm, native C/Rust, or portable plugins</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closePluginInstallModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="padding: 20px; display: flex; flex-direction: column; gap: 14px;">
          <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 12px;">
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Plugin Type <span style="color:var(--rose-dot)">*</span></label>
              <select id="plugin-modal-type" class="select-input" style="width: 100%;">
                <option value="wasm">WebAssembly (Wasm) 🦀</option>
                <option value="source">Source Connector 📥</option>
                <option value="sink">Sink Connector 📤</option>
                <option value="function">Function Plugin ⚡</option>
                <option value="portable">Portable Plugin 📦</option>
              </select>
            </div>
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Plugin Name <span style="color:var(--rose-dot)">*</span></label>
              <input type="text" id="plugin-modal-name" class="text-input" placeholder="e.g. wasm_filter" style="width: 100%; font-family: var(--font-mono);" />
            </div>
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">File Path or Remote URL <span style="color:var(--rose-dot)">*</span></label>
            <input type="text" id="plugin-modal-file" class="text-input" placeholder="file:///etc/uploads/plugin.wasm or https://..." style="width: 100%; font-family: var(--font-mono);" />
            <div style="font-size: 11px; color: var(--text-muted); margin-top: 4px;">Can reference an artifact from File Storage (e.g. etc/uploads/my_plugin.wasm)</div>
          </div>

          <div id="plugin-modal-symbols-row">
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Exported Functions / Symbols (optional)</label>
            <input type="text" id="plugin-modal-symbols" class="text-input" placeholder="Comma-separated: filter, transform, score" style="width: 100%; font-family: var(--font-mono);" />
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; background: #fafbfc; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px;">
          <button type="button" class="btn btn-sm" onclick="closePluginInstallModal()">Cancel</button>
          <button type="button" class="btn btn-sm btn-primary" onclick="submitPluginInstall()">Register &amp; Install 🔌</button>
        </div>
      </div>
    </div>

    <!-- Phase 4: JavaScript UDF Editor & Sandbox Modal -->
    <div id="js-udf-modal" class="fleet-modal-overlay" style="display: none; z-index: 110;">
      <div class="fleet-modal-dialog" style="max-width: 960px; width: 92vw; height: 86vh; max-height: 800px; display: flex; flex-direction: column;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">⚡</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="js-udf-modal-title">JavaScript User-Defined Function (UDF)</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Author scalar transformations and custom aggregate functions in JavaScript</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeJsUdfModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="flex: 1; overflow-y: auto; padding: 18px 20px; display: flex; flex-direction: column; gap: 14px;">
          <!-- Top Row -->
          <div style="display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px;">
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Function Name / Identifier <span style="color:var(--rose-dot)">*</span></label>
              <input type="text" id="js-udf-modal-id" class="text-input" placeholder="e.g. celsius_to_fahrenheit" style="width: 100%; font-family: var(--font-mono);" />
            </div>
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Function Mode <span style="color:var(--rose-dot)">*</span></label>
              <select id="js-udf-modal-agg" class="select-input" style="width: 100%;" onchange="handleJsUdfKindChange()">
                <option value="false">Scalar Function (Row-by-Row 1 &rarr; 1)</option>
                <option value="true">Window Aggregate Function (Array &rarr; 1)</option>
              </select>
            </div>
            <div>
              <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Code Snippet Templates</label>
              <select id="js-udf-modal-template" class="select-input" style="width: 100%;" onchange="loadJsUdfTemplate(this.value)">
                <option value="">Load Template...</option>
                <option value="scalar_temp">Temperature Converter (Scalar)</option>
                <option value="scalar_norm">Min-Max Normalizer (Scalar)</option>
                <option value="agg_median">Moving Median (Aggregate)</option>
                <option value="agg_range">Peak-to-Peak Range (Aggregate)</option>
              </select>
            </div>
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Description</label>
            <input type="text" id="js-udf-modal-desc" class="text-input" placeholder="Calculates temperature in degrees Fahrenheit" style="width: 100%;" />
          </div>

          <!-- Code Workspace and Sandbox -->
          <div style="display: grid; grid-template-columns: 1fr 340px; gap: 14px; flex: 1; min-height: 320px;">
            <!-- Left: Script Code Editor -->
            <div style="display: flex; flex-direction: column; gap: 6px;">
              <div style="display: flex; justify-content: space-between; align-items: center;">
                <label style="font-size: 12px; font-weight: 600;">JavaScript Implementation <span style="color:var(--rose-dot)">*</span></label>
                <span style="font-size: 11px; color: var(--text-muted);">Executed via quickjs engine in pure Rust</span>
              </div>
              <textarea id="js-udf-modal-code" style="flex: 1; min-height: 280px; background: #090e17; color: #a5f3fc; font-family: var(--font-mono); font-size: 12px; padding: 12px 14px; border-radius: 6px; border: 1px solid #1e293b; line-height: 1.5; resize: none; tab-size: 2;" spellcheck="false"></textarea>
            </div>

            <!-- Right: Interactive Sandbox -->
            <div style="display: flex; flex-direction: column; gap: 10px; background: var(--bg-subtle); padding: 14px; border-radius: 6px; border: 1px solid var(--border);">
              <div style="font-weight: 700; font-size: 12px; color: var(--text-primary); display: flex; align-items: center; justify-content: space-between;">
                <span>🧪 Interactive Test Sandbox</span>
                <span class="badge badge-indigo">Preflight Test</span>
              </div>
              <p style="font-size: 11px; color: var(--text-muted); margin: 0;">
                Test execution with sample inputs before saving to the edge runtime:
              </p>

              <div>
                <label style="display: block; font-size: 11px; font-weight: 600; margin-bottom: 4px;">Arguments Array (JSON format)</label>
                <input type="text" id="js-udf-sandbox-args" class="text-input" value="[25]" style="width: 100%; font-family: var(--font-mono); font-size: 12px;" />
              </div>

              <button type="button" class="btn btn-sm btn-primary" onclick="runJsUdfTestSandbox()" style="width: 100%;">
                ⚡ Run Test in Sandbox
              </button>

              <div style="flex: 1; display: flex; flex-direction: column; gap: 4px;">
                <label style="font-size: 11px; font-weight: 600;">Execution Result</label>
                <pre id="js-udf-sandbox-result" style="flex: 1; min-height: 100px; margin: 0; background: var(--bg-surface); border: 1px solid var(--border); border-radius: 4px; padding: 8px 10px; font-family: var(--font-mono); font-size: 11px; overflow-y: auto; color: var(--text-secondary); line-height: 1.4;">Click "Run Test" to evaluate.</pre>
              </div>
            </div>
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; background: #fafbfc; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center;">
          <div id="js-udf-modal-status-text" style="font-size: 12px; color: var(--text-muted);">Native zero-dependency JavaScript execution</div>
          <div style="display: flex; gap: 8px;">
            <button type="button" class="btn btn-sm" onclick="closeJsUdfModal()">Cancel</button>
            <button type="button" class="btn btn-sm btn-primary" onclick="submitJsUdfModal()">Save JavaScript UDF 💾</button>
          </div>
        </div>
      </div>
    </div>

    <!-- Phase 4: External Service Register Modal -->
    <div id="service-register-modal" class="fleet-modal-overlay" style="display: none; z-index: 110;">
      <div class="fleet-modal-dialog" style="max-width: 620px; width: 90vw;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">🌐</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);">Register External Service / RPC</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Expose external microservices as callable SQL functions</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeServiceRegisterModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="padding: 20px; display: flex; flex-direction: column; gap: 14px;">
          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Service Name <span style="color:var(--rose-dot)">*</span></label>
            <input type="text" id="service-modal-name" class="text-input" placeholder="e.g. ai_vision_service" style="width: 100%; font-family: var(--font-mono);" />
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Target Service Endpoint Address <span style="color:var(--rose-dot)">*</span></label>
            <input type="text" id="service-modal-addr" class="text-input" placeholder="e.g. http://127.0.0.1:8080 or grpc://localhost:50051" style="width: 100%; font-family: var(--font-mono);" />
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Interface Name <span style="color:var(--rose-dot)">*</span></label>
            <input type="text" id="service-modal-iface" class="text-input" placeholder="e.g. imageClassifier" style="width: 100%; font-family: var(--font-mono);" />
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Exported Methods (comma-separated) <span style="color:var(--rose-dot)">*</span></label>
            <input type="text" id="service-modal-methods" class="text-input" placeholder="predict, detect_defect, compute_confidence" style="width: 100%; font-family: var(--font-mono);" />
            <div style="font-size: 11px; color: var(--text-muted); margin-top: 4px;">These methods will become directly callable in rekuiper SQL queries</div>
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; background: #fafbfc; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px;">
          <button type="button" class="btn btn-sm" onclick="closeServiceRegisterModal()">Cancel</button>
          <button type="button" class="btn btn-sm btn-primary" onclick="submitServiceRegister()">Register Service 🌐</button>
        </div>
      </div>
    </div>

    <!-- Phase 4: File Upload Modal -->
    <div id="file-upload-modal" class="fleet-modal-overlay" style="display: none; z-index: 110;">
      <div class="fleet-modal-dialog" style="max-width: 540px; width: 90vw;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">📁</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);">Upload Configuration Artifact</strong>
              <div style="font-size: 11px; color: var(--text-muted);">Certificates, models, proto files, and binary assets</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closeFileUploadModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="padding: 20px; display: flex; flex-direction: column; gap: 14px;">
          <div class="dropzone-box" id="upload-modal-dropzone" onclick="document.getElementById('upload-modal-file-input').click()">
            <input type="file" id="upload-modal-file-input" style="display: none;" onchange="handleModalFileSelect(event)" />
            <div style="font-size: 28px; margin-bottom: 6px;">📄</div>
            <div style="font-weight: 600; font-size: 13px;" id="upload-modal-file-label">Click or Drag &amp; Drop File Here</div>
            <div style="font-size: 11px; color: var(--text-muted); margin-top: 4px;">Certificates (.pem, .crt), proto (.proto), models (.onnx), etc.</div>
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Artifact Filename on Edge Device <span style="color:var(--rose-dot)">*</span></label>
            <input type="text" id="upload-modal-name" class="text-input" placeholder="e.g. ca_cert.pem" style="width: 100%; font-family: var(--font-mono);" />
          </div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; background: #fafbfc; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px;">
          <button type="button" class="btn btn-sm" onclick="closeFileUploadModal()">Cancel</button>
          <button type="button" class="btn btn-sm btn-primary" id="upload-modal-submit-btn" onclick="submitFileUpload()" disabled>Upload Artifact 📁</button>
        </div>
      </div>
    </div>

    <!-- Phase 4: Plugin Inspect Modal -->
    <div id="plugin-inspect-modal" class="fleet-modal-overlay" style="display: none; z-index: 110;">
      <div class="fleet-modal-dialog" style="max-width: 640px; width: 90vw;">
        <div class="fleet-modal-header" style="padding: 14px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <span style="font-size: 18px;">🔍</span>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);" id="plugin-inspect-title">Plugin Diagnostics</strong>
              <div style="font-size: 11px; color: var(--text-muted);" id="plugin-inspect-subtitle">Runtime symbols, type, and health</div>
            </div>
          </div>
          <button class="btn btn-sm" onclick="closePluginInspectModal()" title="Close">&#x2715;</button>
        </div>

        <div class="fleet-modal-body" style="padding: 20px; display: flex; flex-direction: column; gap: 14px;">
          <div style="display: flex; align-items: center; gap: 10px; background: var(--bg-subtle); padding: 10px 14px; border-radius: 6px; border: 1px solid var(--border);">
            <span id="plugin-inspect-type-badge" class="badge badge-indigo">WASM</span>
            <span id="plugin-inspect-status-badge" class="badge badge-emerald">Installed &amp; Registered</span>
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Registered Export Symbols / Functions</label>
            <div id="plugin-inspect-symbols-list" style="display: flex; flex-wrap: wrap; gap: 6px;"></div>
          </div>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 4px;">Raw Details</label>
            <pre id="plugin-inspect-raw" style="background: #090e17; color: #38bdf8; font-family: var(--font-mono); font-size: 12px; padding: 10px 12px; border-radius: 6px; border: 1px solid #1e293b; margin: 0; line-height: 1.4; overflow-x: auto;"></pre>
        </div>
        <div class="fleet-modal-footer" style="padding: 10px 20px;">
          <button type="button" class="btn btn-sm" onclick="closePluginInspectModal()">Close</button>
        </div>
      </div>
    </div>
    <div id="console-auth-modal" class="fleet-modal-overlay" style="display: none; z-index: 999; backdrop-filter: blur(4px);">
      <div class="fleet-modal-dialog" style="max-width: 480px; width: 90vw; border: 1px solid var(--border); box-shadow: 0 20px 40px rgba(0,0,0,0.25);">
        <div class="fleet-modal-header" style="padding: 16px 20px; background: #fafbfc;">
          <div style="display: flex; align-items: center; gap: 10px;">
            <div style="width: 36px; height: 36px; border-radius: 8px; background: #fee2e2; color: #dc2626; display: flex; align-items: center; justify-content: center; font-size: 18px;">
              🔒
            </div>
            <div>
              <strong style="font-size: 15px; color: var(--text-primary);">Console Security Guard</strong>
              <div style="font-size: 11px; color: var(--text-muted);">rekuiper Edge Access Control</div>
            </div>
          </div>
          <button type="button" class="btn btn-sm" onclick="closeConsoleAuthModal(false)" style="border: none; font-size: 16px;">✕</button>
        </div>

        <div class="fleet-modal-body" style="padding: 20px; display: flex; flex-direction: column; gap: 14px;">
          <p style="font-size: 13px; color: var(--text-secondary); margin: 0; line-height: 1.5;">
            This edge stream engine requires an authentication credential to unlock pipelines, schemas, and runtime management.
          </p>

          <div>
            <label style="display: block; font-size: 12px; font-weight: 600; margin-bottom: 6px;">
              Console Password or JWT / Fleet Token <span style="color:var(--rose-dot)">*</span>
            </label>
            <div style="display: flex; gap: 8px;">
              <input type="password" id="console-auth-input" class="text-input" placeholder="Enter password or RS256 token..." style="flex: 1; font-family: var(--font-mono); font-size: 13px;" onkeydown="if(event.key==='Enter') submitConsoleAuth()" />
              <button type="button" class="btn btn-sm" onclick="toggleConsolePasswordVisibility()" id="console-auth-toggle-btn" title="Show/Hide Password">👁</button>
            </div>
          </div>

          <label style="display: flex; align-items: center; gap: 8px; font-size: 12px; cursor: pointer; color: var(--text-secondary);">
            <input type="checkbox" id="console-auth-remember" checked />
            <span>Keep me authenticated on this workstation (session storage)</span>
          </label>

          <div id="console-auth-error" style="display: none; padding: 8px 12px; border-radius: 6px; background: #fef2f2; border: 1px solid #fecaca; color: #dc2626; font-size: 12px;"></div>
        </div>

        <div class="fleet-modal-footer" style="padding: 12px 20px; background: #fafbfc; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center;">
          <a href="javascript:void(0)" onclick="openDoc('guide/ui/web_console_user_guide#security--access-control-architecture')" style="font-size: 12px; color: var(--accent); text-decoration: none;">📖 Security Docs</a>
          <div style="display: flex; gap: 8px;">
            <button type="button" class="btn btn-sm" onclick="closeConsoleAuthModal(false)">Cancel</button>
            <button type="button" class="btn btn-sm btn-primary" onclick="submitConsoleAuth()">Unlock Console 🔓</button>
          </div>
        </div>
      </div>
    </div>

  </main>

  <div class="toast-container" id="toast-container"></div>

  <script>
    const state = {
      rules: [],
      ruleMetrics: {},
      prevTotals: { ts: 0, inCount: 0, outCount: 0, perRuleIn: {}, perRuleOut: {} },
      rates: { totalIn: 0, totalOut: 0, perRuleIn: {}, perRuleOut: {} },
      streams: [],
      tables: [],
      connections: [],
      declarativeMode: false,
      selectedRuleId: null,
      pollTimer: null,
      pollIntervalMs: 2000
    };

    const OTLP_PRESETS = {
      '/v1/metrics': {
        resourceMetrics: [{
          resource: {
            attributes: [
              { key: "service.name", value: { stringValue: "plc-edge-gateway-01" } },
              { key: "host.arch", value: { stringValue: "aarch64" } }
            ]
          },
          scopeMetrics: [{
            metrics: [{
              name: "industrial.motor.temperature",
              unit: "Cel",
              gauge: {
                dataPoints: [{
                  timeUnixNano: "1760478000000000000",
                  asDouble: 84.6,
                  attributes: [{ key: "line", value: { stringValue: "assembly-A" } }]
                }]
              }
            }]
          }]
        }]
      },
      '/v1/logs': {
        resourceLogs: [{
          resource: {
            attributes: [{ key: "service.name", value: { stringValue: "modbus-poller" } }]
          },
          scopeLogs: [{
            logRecords: [{
              timeUnixNano: "1760478000000000000",
              severityNumber: 17,
              severityText: "ERROR",
              body: { stringValue: "Modbus slave 1 register 40001 CRC mismatch" },
              attributes: [{ key: "slave_id", value: { intValue: "1" } }]
            }]
          }]
        }]
      },
      '/v1/traces': {
        resourceSpans: [{
          resource: {
            attributes: [{ key: "service.name", value: { stringValue: "opcua-subscriber" } }]
          },
          scopeSpans: [{
            spans: [{
              traceId: "4bf92f3577b34da6a3ce929d0e0e4736",
              spanId: "00f067aa0ba902b7",
              name: "ReadNodeId",
              startTimeUnixNano: "1760478000000000000",
              endTimeUnixNano: "1760478000004500000",
              attributes: [{ key: "node_id", value: { stringValue: "ns=2;s=Temperature" } }]
            }]
          }]
        }]
      },
      '/data/demo': {
        temperature: 82.4,
        humidity: 48.0,
        device_id: "sensor-01"
      }
    };

    function showToast(msg, type = 'info') {
      const container = document.getElementById('toast-container');
      const el = document.createElement('div');
      el.className = `toast toast-${type}`;
      el.textContent = msg;
      container.appendChild(el);
      setTimeout(() => el.remove(), 3500);
    }

    function fmtNum(n) {
      if (n === undefined || n === null || isNaN(n)) return '0';
      return Number(n).toLocaleString();
    }

    // --- Documentation & Help/FAQ Navigation ---
    function openDoc(slug) {
      if (!slug) slug = 'guide/ui/web_console_user_guide';
      let path = slug;
      let hash = '';
      if (path.includes('#')) {
        const parts = path.split('#');
        path = parts[0];
        hash = '#' + parts.slice(1).join('#');
      }
      path = path.replace(/\.md$/, '').replace(/\.html$/, '');
      if (path.startsWith('/')) path = path.slice(1);
      const url = `https://rekuiper.indramqtt.com/${path}.html${hash}`;
      window.open(url, '_blank');
    }

    // --- Console Auth & Access Control ---
    function getAuthToken() {
      return sessionStorage.getItem('rekuiper_console_token') || localStorage.getItem('rekuiper_console_token') || '';
    }

    function setAuthToken(token, remember = true) {
      if (!token) {
        sessionStorage.removeItem('rekuiper_console_token');
        localStorage.removeItem('rekuiper_console_token');
        return;
      }
      if (remember) {
        localStorage.setItem('rekuiper_console_token', token);
      } else {
        sessionStorage.setItem('rekuiper_console_token', token);
      }
    }

    function clearAuthToken() {
      sessionStorage.removeItem('rekuiper_console_token');
      localStorage.removeItem('rekuiper_console_token');
    }

    function toggleConsolePasswordVisibility() {
      const input = document.getElementById('console-auth-input');
      const btn = document.getElementById('console-auth-toggle-btn');
      if (input.type === 'password') {
        input.type = 'text';
        btn.textContent = '🔒';
      } else {
        input.type = 'password';
        btn.textContent = '👁';
      }
    }

    function openConsoleAuthModal(isChallenge = false) {
      const modal = document.getElementById('console-auth-modal');
      const errBox = document.getElementById('console-auth-error');
      if (errBox) errBox.style.display = 'none';
      const input = document.getElementById('console-auth-input');
      if (input) input.value = getAuthToken();
      if (modal) modal.style.display = 'flex';
      setTimeout(() => { if (input) input.focus(); }, 100);
      if (isChallenge && errBox) {
        errBox.textContent = 'Authentication required or token expired. Please unlock the console.';
        errBox.style.display = 'block';
      }
    }

    function closeConsoleAuthModal(refresh = false) {
      const modal = document.getElementById('console-auth-modal');
      if (modal) modal.style.display = 'none';
      if (refresh) {
        refreshAll();
      }
    }

    async function submitConsoleAuth() {
      const input = document.getElementById('console-auth-input');
      const remember = document.getElementById('console-auth-remember')?.checked ?? true;
      const errBox = document.getElementById('console-auth-error');
      const val = (input?.value || '').trim();

      if (!val) {
        if (errBox) {
          errBox.textContent = 'Please enter password or JWT token.';
          errBox.style.display = 'block';
        }
        return;
      }

      if (errBox) errBox.style.display = 'none';

      try {
        const res = await fetch('/api/ui/login', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ password: val })
        });

        if (res.ok) {
          const data = await res.json().catch(() => ({}));
          const token = data.token || val;
          setAuthToken(token, remember);
          showToast('Console unlocked successfully 🔓', 'success');
          closeConsoleAuthModal(true);
          await checkConsoleAuthStatus();
        } else {
          // If login endpoint rejected, verify if it is a raw RS256 JWT
          const probe = await fetch('/rules', {
            headers: { 'Authorization': `Bearer ${val}` }
          });
          if (probe.ok) {
            setAuthToken(val, remember);
            showToast('JWT / Token authenticated 🔓', 'success');
            closeConsoleAuthModal(true);
            await checkConsoleAuthStatus();
          } else {
            if (errBox) {
              errBox.textContent = 'Invalid credentials or token rejected by server.';
              errBox.style.display = 'block';
            }
          }
        }
      } catch (err) {
        if (errBox) {
          errBox.textContent = `Authentication error: ${err.message}`;
          errBox.style.display = 'block';
        }
      }
    }

    async function checkConsoleAuthStatus() {
      const indicator = document.getElementById('topbar-auth-indicator');
      const token = getAuthToken();
      try {
        const headers = token ? { 'Authorization': `Bearer ${token}` } : {};
        const res = await fetch('/api/ui/auth-status', { headers });
        if (res.ok) {
          const info = await res.json();
          if (!info.auth_required) {
            if (indicator) indicator.innerHTML = '🟢 <span style="font-size:11px; font-weight:600;">Open Mode</span>';
          } else if (info.authenticated) {
            if (indicator) indicator.innerHTML = '🔒 <span style="font-size:11px; font-weight:600; color:#10b981;">Protected (Unlocked)</span>';
          } else {
            if (indicator) indicator.innerHTML = '⚠️ <span style="font-size:11px; font-weight:600; color:#f59e0b;">Locked</span>';
            if (token) clearAuthToken();
          }
        }
      } catch (_) {}
    }

    // --- Guided Pipeline & Quick Start Assistant ---
    function dismissQuickStartBanner() {
      const banner = document.getElementById('quickstart-banner');
      if (banner) banner.style.display = 'none';
      try {
        localStorage.setItem('rekuiper_dismiss_quickstart', 'true');
      } catch (_) {}
    }

    function checkQuickStartBannerPreference() {
      try {
        if (localStorage.getItem('rekuiper_dismiss_quickstart') === 'true') {
          const banner = document.getElementById('quickstart-banner');
          if (banner) banner.style.display = 'none';
        }
      } catch (_) {}
    }

    function launchGuidedQuickStartPipeline() {
      openNewRuleDesigner();
      loadRuleRecipe('overheat');
      showToast('Guided Pipeline pre-configured! Review Steps 1-3 and deploy 🪄', 'info');
    }

    async function apiFetch(path, options = {}) {
      const fetchOpts = Object.assign({}, options);
      const token = getAuthToken();
      fetchOpts.headers = Object.assign({}, fetchOpts.headers || {});
      if (token && !fetchOpts.headers['Authorization']) {
        fetchOpts.headers['Authorization'] = `Bearer ${token}`;
      }
      if (fetchOpts.body && typeof fetchOpts.body === 'object' && !(fetchOpts.body instanceof FormData)) {
        fetchOpts.headers['Content-Type'] = 'application/json';
        fetchOpts.body = JSON.stringify(fetchOpts.body);
      }
      const res = await fetch(path, fetchOpts);
      if (res.status === 401 && path !== '/api/ui/login' && path !== '/api/ui/auth-status') {
        openConsoleAuthModal(true);
      }
      const contentType = res.headers.get('content-type') || '';
      let body = null;
      if (contentType.includes('application/json')) {
        body = await res.json().catch(() => null);
      } else {
        body = await res.text().catch(() => '');
      }
      return { ok: res.ok, status: res.status, body };
    }

    function extractMetricSum(metricsObj, suffix) {
      if (!metricsObj || typeof metricsObj !== 'object') return 0;
      let total = 0;
      const normSuffix = String(suffix).toLowerCase().replace(/_/g, '');
      for (const [k, v] of Object.entries(metricsObj)) {
        if (typeof v !== 'number') continue;
        const normKey = String(k).toLowerCase().replace(/_/g, '');
        if (normKey === normSuffix || normKey.endsWith(normSuffix)) {
          total += v;
        }
      }
      return total;
    }

    async function refreshAll(manual = false) {
      try {
        const [pingRes, rulesRes, streamsRes, tablesRes, connsRes, promRes] = await Promise.all([
          apiFetch('/'),
          apiFetch('/rules'),
          apiFetch('/streams'),
          apiFetch('/tables'),
          apiFetch('/connections'),
          apiFetch('/metrics')
        ]);

        // Connection status
        const connBadge = document.getElementById('conn-badge');
        const connText = document.getElementById('conn-text');
        if (rulesRes.ok) {
          connBadge.className = 'badge badge-emerald';
          connText.textContent = (pingRes.body && pingRes.body.version)
            ? `v${pingRes.body.version}`
            : 'Online';
          if (pingRes.body && pingRes.body.uptime) {
            document.getElementById('kpi-uptime').textContent = `Up ${pingRes.body.uptime}s`;
          }
        } else {
          connBadge.className = 'badge badge-rose';
          connText.textContent = 'Disconnected';
        }

        // Check declarative mode from ping/metrics
        const promText = typeof promRes.body === 'string' ? promRes.body : '';
        if (
          (pingRes.body && pingRes.body.declarative_mode === true) ||
          promText.includes('rekuiper_declarative_reload_failures_total')
        ) {
          setDeclarativeBadge(true);
        }

        // Normalize rules list
        const rawRules = Array.isArray(rulesRes.body) ? rulesRes.body : [];
        state.rules = rawRules.map(r => {
          if (typeof r === 'string') return { id: r, status: 'Running' };
          return {
            id: r.id || r.name || 'unknown',
            status: r.status || 'Running',
            message: r.message || ''
          };
        });

        // Fetch per-rule status metrics in parallel
        const statusPromises = state.rules.map(r =>
          apiFetch(`/rules/${encodeURIComponent(r.id)}/status`).then(res => [r.id, res.ok ? res.body : {}])
        );
        const statusEntries = await Promise.all(statusPromises);
        const nextMetrics = {};
        for (const [id, m] of statusEntries) {
          nextMetrics[id] = m || {};
        }
        state.ruleMetrics = nextMetrics;

        // Calculate rates
        const now = Date.now();
        const dtSec = state.prevTotals.ts > 0 ? Math.max((now - state.prevTotals.ts) / 1000, 0.2) : 0;

        let sumIn = 0;
        let sumOut = 0;
        let sumFiltered = 0;
        let sumCache = 0;
        let sumDlq = 0;
        let sumExc = 0;

        for (const r of state.rules) {
          const m = state.ruleMetrics[r.id] || {};
          const rIn = extractMetricSum(m, 'records_in_total');
          const rOut = extractMetricSum(m, 'records_out_total');
          const rFilt = extractMetricSum(m, 'records_filtered_total');
          const rCache = extractMetricSum(m, 'sink_cache_len') || extractMetricSum(m, 'buffer_length');
          const rDlq = extractMetricSum(m, 'dlq_records_total');
          const rExc = extractMetricSum(m, 'exceptions_total');

          sumIn += rIn;
          sumOut += rOut;
          sumFiltered += rFilt;
          sumCache += rCache;
          sumDlq += rDlq;
          sumExc += rExc;

          if (dtSec > 0 && state.prevTotals.perRuleIn[r.id] !== undefined) {
            state.rates.perRuleIn[r.id] = Math.max(0, Math.round((rIn - state.prevTotals.perRuleIn[r.id]) / dtSec));
            state.rates.perRuleOut[r.id] = Math.max(0, Math.round((rOut - state.prevTotals.perRuleOut[r.id]) / dtSec));
          } else {
            state.rates.perRuleIn[r.id] = 0;
            state.rates.perRuleOut[r.id] = 0;
          }
          state.prevTotals.perRuleIn[r.id] = rIn;
          state.prevTotals.perRuleOut[r.id] = rOut;
        }

        if (dtSec > 0 && state.prevTotals.ts > 0) {
          state.rates.totalIn = Math.max(0, Math.round((sumIn - state.prevTotals.inCount) / dtSec));
          state.rates.totalOut = Math.max(0, Math.round((sumOut - state.prevTotals.outCount) / dtSec));
        }
        state.prevTotals.ts = now;
        state.prevTotals.inCount = sumIn;
        state.prevTotals.outCount = sumOut;

        // Streams, Tables, Connections
        state.streams = Array.isArray(streamsRes.body) ? streamsRes.body : [];
        state.tables = Array.isArray(tablesRes.body) ? tablesRes.body : [];
        state.connections = Array.isArray(connsRes.body)
          ? connsRes.body
          : (connsRes.body && typeof connsRes.body === 'object' ? Object.entries(connsRes.body) : []);

        // Update KPIs
        updateKpiCards(sumIn, sumOut, sumFiltered, sumCache, sumDlq, sumExc);
        renderRulesTable();
        renderCatalogTables();
        fetchSchemas();

        if (document.getElementById('view-metrics').style.display !== 'none' && promText) {
          document.getElementById('prom-metrics-box').textContent = promText;
        }

        if (state.selectedRuleId) {
          await refreshInspector(state.selectedRuleId);
        }

        if (typeof updateStudioThroughputFromRule === 'function' && studio.ruleId) {
          updateStudioThroughputFromRule(studio.ruleId);
        }

        if (manual) showToast('Dashboard state refreshed', 'success');
      } catch (err) {
        document.getElementById('conn-badge').className = 'badge badge-rose';
        document.getElementById('conn-text').textContent = 'Offline';
      }
    }

    function setDeclarativeBadge(isDeclarative) {
      state.declarativeMode = isDeclarative;
      const badge = document.getElementById('mode-badge');
      const reloadBtn = document.getElementById('reload-manifest-btn');
      if (isDeclarative) {
        badge.className = 'badge badge-indigo';
        badge.textContent = 'Declarative GitOps (Read-Only)';
        reloadBtn.style.display = 'inline-flex';
      } else {
        badge.className = 'badge badge-slate';
        badge.textContent = 'Mutable Mode';
        reloadBtn.style.display = 'none';
      }
    }

    function updateKpiCards(sumIn, sumOut, sumFiltered, sumCache, sumDlq, sumExc) {
      const totalRules = state.rules.length;
      const runningRules = state.rules.filter(r => String(r.status).toLowerCase().includes('running')).length;
      const stoppedRules = totalRules - runningRules;

      document.getElementById('kpi-rules-count').textContent = `${runningRules} / ${totalRules}`;
      document.getElementById('kpi-rules-stopped').textContent = `${stoppedRules} stopped`;
      const pctEl = document.getElementById('kpi-rules-pct');
      pctEl.textContent = totalRules > 0 ? `${Math.round((runningRules / totalRules) * 100)}%` : 'Idle';
      pctEl.className = stoppedRules > 0 ? 'badge badge-amber' : 'badge badge-emerald';

      document.getElementById('kpi-in-rate').innerHTML = `${fmtNum(state.rates.totalIn)} <span style="font-size: 13px; font-weight: 500; color: var(--text-muted);">rec/s</span>`;
      document.getElementById('kpi-in-total').textContent = fmtNum(sumIn);

      document.getElementById('kpi-out-rate').innerHTML = `${fmtNum(state.rates.totalOut)} <span style="font-size: 13px; font-weight: 500; color: var(--text-muted);">rec/s</span>`;
      document.getElementById('kpi-out-total').textContent = fmtNum(sumOut);

      document.getElementById('kpi-catalog-count').textContent = fmtNum(state.streams.length + state.tables.length);
      document.getElementById('kpi-streams-sub').textContent = `${state.streams.length} Streams`;
      document.getElementById('kpi-tables-sub').textContent = `${state.tables.length} Tables`;

      document.getElementById('kpi-cache-depth').textContent = fmtNum(sumCache);
      document.getElementById('kpi-filtered-total').textContent = fmtNum(sumFiltered);

      document.getElementById('kpi-dlq-total').textContent = fmtNum(sumDlq);
      document.getElementById('kpi-exc-total').textContent = fmtNum(sumExc);

      const dlqCard = document.getElementById('kpi-dlq-card');
      const dlqBadge = document.getElementById('kpi-dlq-badge');
      if (sumDlq > 0 || sumExc > 0) {
        dlqCard.classList.add('alert-card');
        dlqBadge.className = 'badge badge-rose';
        dlqBadge.textContent = `${fmtNum(sumDlq)} Poison Pills`;
      } else {
        dlqCard.classList.remove('alert-card');
        dlqBadge.className = 'badge badge-emerald';
        dlqBadge.textContent = 'Clean';
      }
    }

    function renderRulesTable() {
      const tbody = document.getElementById('rules-tbody');
      const query = (document.getElementById('rule-search').value || '').toLowerCase().trim();
      const statusFilter = document.getElementById('rule-status-filter').value;

      const filtered = state.rules.filter(r => {
        const m = state.ruleMetrics[r.id] || {};
        const rDlq = extractMetricSum(m, 'dlq_records_total') + extractMetricSum(m, 'exceptions_total');
        const isRunning = String(r.status).toLowerCase().includes('running');

        if (query && !r.id.toLowerCase().includes(query) && !String(r.status).toLowerCase().includes(query)) {
          return false;
        }
        if (statusFilter === 'running' && !isRunning) return false;
        if (statusFilter === 'stopped' && isRunning) return false;
        if (statusFilter === 'dlq' && rDlq === 0) return false;
        return true;
      });

      document.getElementById('table-rule-count').textContent = filtered.length;

      if (filtered.length === 0) {
        tbody.innerHTML = `<tr><td colspan="8" class="empty-state">No matching rules found.</td></tr>`;
        return;
      }

      tbody.innerHTML = filtered.map(r => {
        const m = state.ruleMetrics[r.id] || {};
        const rIn = extractMetricSum(m, 'records_in_total');
        const rOut = extractMetricSum(m, 'records_out_total');
        const rFilt = extractMetricSum(m, 'records_filtered_total');
        const rCache = extractMetricSum(m, 'sink_cache_len') || extractMetricSum(m, 'buffer_length');
        const rDlq = extractMetricSum(m, 'dlq_records_total');
        const rExc = extractMetricSum(m, 'exceptions_total');
        const inRate = state.rates.perRuleIn[r.id] || 0;
        const outRate = state.rates.perRuleOut[r.id] || 0;

        const isRunning = String(r.status).toLowerCase().includes('running');
        const isSelected = state.selectedRuleId === r.id;

        const statusBadge = isRunning
          ? `<span class="badge badge-emerald"><span class="badge-dot"></span>Running</span>`
          : `<span class="badge badge-amber"><span class="badge-dot"></span>${escapeHtml(r.status)}</span>`;

        const dlqCell = (rDlq > 0 || rExc > 0)
          ? `<span class="badge badge-rose tabular"><span class="badge-dot"></span>${fmtNum(rDlq)} DLQ / ${fmtNum(rExc)} Exc</span>`
          : `<span class="badge badge-slate tabular">0</span>`;

        const toggleBtn = state.declarativeMode
          ? ''
          : `<button class="btn btn-sm" onclick="event.stopPropagation(); toggleRuleState('${escapeHtml(r.id)}', ${isRunning})">

               ${isRunning ? 'Stop' : 'Start'}

             </button>`;

        return `

          <tr class="clickable-row ${isSelected ? 'selected-row' : ''}" onclick="selectRule('${escapeHtml(r.id)}')">

            <td style="font-family: var(--font-mono); font-weight: 600;">${escapeHtml(r.id)}</td>

            <td>${statusBadge}</td>

            <td class="tabular">${fmtNum(rIn)} <span class="rate-pill">(${inRate}/s)</span></td>

            <td class="tabular">${fmtNum(rOut)} <span class="rate-pill">(${outRate}/s)</span></td>

            <td class="tabular">${fmtNum(rFilt)}</td>

            <td class="tabular">${fmtNum(rCache)}</td>

            <td>${dlqCell}</td>

            <td style="text-align: right;">

              <div style="display: inline-flex; gap: 6px;">

                <button class="btn btn-sm" title="Open in 3-Step Designer" style="background: #1e293b; color: #a78bfa; border-color: #8b5cf6;" onclick="event.stopPropagation(); openExistingRuleDesigner('${escapeHtml(r.id)}')">Designer 🪄</button>

                <button class="btn btn-sm" title="Edit in Visual Studio" style="background: #1e293b; color: #fb923c; border-color: #ea580c;" onclick="event.stopPropagation(); loadRuleIntoStudio('${escapeHtml(r.id)}')">Studio 🎨</button>

                <button class="btn btn-sm" onclick="event.stopPropagation(); selectRule('${escapeHtml(r.id)}')">Inspect</button>

                ${toggleBtn}

              </div>

            </td>

          </tr>

        `;
      }).join('');
    }

    async function selectRule(ruleId) {
      state.selectedRuleId = ruleId;
      document.getElementById('view-rules').classList.add('with-inspector');
      document.getElementById('rule-inspector').style.display = 'flex';
      renderRulesTable();
      await refreshInspector(ruleId);
    }

    function closeInspector() {
      state.selectedRuleId = null;
      document.getElementById('view-rules').classList.remove('with-inspector');
      document.getElementById('rule-inspector').style.display = 'none';
      renderRulesTable();
    }

    async function refreshInspector(ruleId) {
      document.getElementById('insp-rule-id').textContent = ruleId;
      const ruleEntry = state.rules.find(r => r.id === ruleId);
      const isRunning = ruleEntry ? String(ruleEntry.status).toLowerCase().includes('running') : true;
      const badge = document.getElementById('insp-status-badge');
      badge.className = isRunning ? 'badge badge-emerald' : 'badge badge-amber';
      badge.textContent = ruleEntry ? ruleEntry.status : 'Running';

      const [defRes, dlqRes] = await Promise.all([
        apiFetch(`/rules/${encodeURIComponent(ruleId)}`),
        apiFetch(`/rules/${encodeURIComponent(ruleId)}/errors`)
      ]);

      if (defRes.ok && defRes.body) {
        document.getElementById('insp-sql').textContent = defRes.body.sql || 'N/A';
        const opts = defRes.body.options || {};
        const onError = opts.onError || opts.on_error || 'drop';
        document.getElementById('insp-options-summary').textContent = `onError=${onError}`;
        document.getElementById('insp-actions-json').textContent = JSON.stringify(
          { actions: defRes.body.actions || [], options: opts },
          null,
          2
        );
      }

      if (dlqRes.ok && dlqRes.body) {
        const byStage = dlqRes.body.by_stage || {};
        updateStageBox('st-codec', 'st-codec-val', byStage.codec_decode || byStage.CodecDecode || 0);
        updateStageBox('st-schema', 'st-schema-val', byStage.schema_validation || byStage.SchemaValidation || 0);
        updateStageBox('st-sql', 'st-sql-val', byStage.sql_eval || byStage.SqlEval || 0);
        updateStageBox('st-tpl', 'st-tpl-val', byStage.data_template || byStage.DataTemplate || 0);
        updateStageBox('st-sink', 'st-sink-val', byStage.sink_delivery || byStage.SinkDelivery || 0);

        const errors = Array.isArray(dlqRes.body.errors) ? dlqRes.body.errors : [];
        document.getElementById('insp-dlq-count-label').textContent = `${errors.length} buffered`;

        const listEl = document.getElementById('insp-dlq-list');
        if (errors.length === 0) {
          listEl.innerHTML = `

            <div class="empty-state" style="padding: 18px; background: var(--bg-canvas); border-radius: 6px; border: 1px dashed var(--border);">

              Zero poison pills in ring buffer.

            </div>`;
        } else {
          listEl.innerHTML = errors.slice().reverse().slice(0, 25).map(env => {
            const ts = env.timestamp ? new Date(env.timestamp).toISOString() : '';
            const payloadPreview = env.raw_payload
              ? `<div class="code-block" style="margin-top:4px; font-size:11px;">${escapeHtml(env.raw_payload)}</div>`
              : (env.tuple ? `<div class="code-block" style="margin-top:4px; font-size:11px;">${escapeHtml(JSON.stringify(env.tuple))}</div>` : '');
            return `

              <div class="dlq-item">

                <div class="dlq-item-header">

                  <span class="badge badge-rose">${escapeHtml(String(env.stage || 'error'))}</span>

                  <span class="tabular">${escapeHtml(ts)}</span>

                </div>

                <div class="dlq-error-msg">${escapeHtml(env.error || 'Unknown error')}</div>

                ${payloadPreview}

              </div>

            `;
          }).join('');
        }
      }
    }

    function updateStageBox(boxId, valId, count) {
      const box = document.getElementById(boxId);
      const val = document.getElementById(valId);
      val.textContent = fmtNum(count);
      if (count > 0) {
        box.classList.add('has-err');
      } else {
        box.classList.remove('has-err');
      }
    }

    async function clearSelectedRuleDlq() {
      if (!state.selectedRuleId) return;
      const res = await apiFetch(`/rules/${encodeURIComponent(state.selectedRuleId)}/errors`, { method: 'DELETE' });
      if (res.ok) {
        showToast(`Cleared DLQ ring buffer for '${state.selectedRuleId}'`, 'success');
        await refreshAll();
      } else {
        showToast(`Failed to clear DLQ (${res.status})`, 'error');
      }
    }

    async function toggleRuleState(ruleId, isRunning) {
      const action = isRunning ? 'stop' : 'start';
      const res = await apiFetch(`/rules/${encodeURIComponent(ruleId)}/${action}`, { method: 'POST' });
      if (res.status === 403) {
        setDeclarativeBadge(true);
        showToast('Blocked: Instance is running in read-only Declarative GitOps Mode', 'error');
        return;
      }
      if (res.ok) {
        showToast(`Rule '${ruleId}' ${action}ped`, 'success');
        await refreshAll();
      } else {
        showToast(`Failed to ${action} rule '${ruleId}'`, 'error');
      }
    }

    async function reloadDeclarativeManifest() {
      const res = await apiFetch('/declarative/reload', { method: 'POST' });
      if (res.ok) {
        showToast('Declarative manifest reconciled & reloaded', 'success');
        await refreshAll();
      } else {
        const msg = (res.body && res.body.message) ? res.body.message : `Reload failed (${res.status})`;
        showToast(msg, 'error');
      }
    }

    function renderCatalogTables() {
      document.getElementById('catalog-streams-count').textContent = state.streams.length;
      document.getElementById('catalog-tables-count').textContent = state.tables.length;
      document.getElementById('catalog-conns-count').textContent = state.connections.length;

      const sBody = document.getElementById('streams-tbody');
      sBody.innerHTML = state.streams.length === 0
        ? `<tr><td colspan="3" class="empty-state">No streams defined.</td></tr>`
        : state.streams.map(s => {
            const name = typeof s === 'string' ? s : (s.name || s.id || JSON.stringify(s));
            const detail = typeof s === 'object' ? JSON.stringify(s) : 'Active Stream Source';
            return `

              <tr>

                <td style="font-family:var(--font-mono);font-weight:600;">${escapeHtml(name)}</td>

                <td style="color:var(--text-secondary);font-family:var(--font-mono);font-size:12px;">${escapeHtml(detail)}</td>

                <td style="text-align: right;">

                  <div style="display: inline-flex; gap: 6px;">

                    <button class="btn btn-sm" onclick="openExistingStreamDesigner('stream', '${escapeHtml(name)}')" title="Edit / View Stream">Edit</button>

                    <button class="btn btn-sm" style="color:var(--rose-text);" onclick="deleteCatalogItem('stream', '${escapeHtml(name)}')" title="Delete Stream">Delete</button>

                  </div>

                </td>

              </tr>`;
          }).join('');

      const tBody = document.getElementById('tables-tbody');
      tBody.innerHTML = state.tables.length === 0
        ? `<tr><td colspan="3" class="empty-state">No lookup tables defined.</td></tr>`
        : state.tables.map(t => {
            const name = typeof t === 'string' ? t : (t.name || t.id || JSON.stringify(t));
            const detail = typeof t === 'object' ? JSON.stringify(t) : 'Lookup / Scan Table';
            return `

              <tr>

                <td style="font-family:var(--font-mono);font-weight:600;">${escapeHtml(name)}</td>

                <td style="color:var(--text-secondary);font-family:var(--font-mono);font-size:12px;">${escapeHtml(detail)}</td>

                <td style="text-align: right;">

                  <div style="display: inline-flex; gap: 6px;">

                    <button class="btn btn-sm" onclick="openExistingStreamDesigner('table', '${escapeHtml(name)}')" title="Edit / View Table">Edit</button>

                    <button class="btn btn-sm" style="color:var(--rose-text);" onclick="deleteCatalogItem('table', '${escapeHtml(name)}')" title="Delete Table">Delete</button>

                  </div>

                </td>

              </tr>`;
          }).join('');

      renderConnectionsTable();
      renderSchemasTable();
    }

    function switchTab(tab) {
      ['rules', 'catalog', 'plugins', 'ingest', 'metrics', 'studio', 'fleet'].forEach(t => {
        const el = document.getElementById(`view-${t}`);
        const btn = document.getElementById(`tab-btn-${t}`);
        if (el) {
          el.style.display = (t === tab)
            ? (t === 'rules' || t === 'catalog' || t === 'ingest' ? 'grid' : (t === 'studio' || t === 'fleet' ? 'flex' : 'block'))
            : 'none';
        }
        if (btn) {
          btn.classList.toggle('active', t === tab);
        }
      });
      document.getElementById('rules-filter-bar').style.display = (tab === 'rules') ? 'flex' : 'none';
      if (tab === 'plugins') fetchPluginsHubData();
      if (tab === 'metrics') fetchPrometheusMetrics();
      if (tab === 'studio') initStudioIfNeeded();
      if (tab === 'fleet') initFleetIfNeeded();
    }

    async function fetchPrometheusMetrics() {
      const res = await apiFetch('/metrics');
      document.getElementById('prom-metrics-box').textContent = res.ok ? res.body : `Failed to load /metrics (${res.status})`;
    }

    function loadPresetPayload(endpoint) {
      document.getElementById('ingest-custom-path').value = endpoint;
      const preset = OTLP_PRESETS[endpoint] || OTLP_PRESETS['/v1/metrics'];
      document.getElementById('ingest-payload').value = JSON.stringify(preset, null, 2);
    }

    async function sendIngestPayload() {
      const path = document.getElementById('ingest-custom-path').value.trim();
      const rawBody = document.getElementById('ingest-payload').value;
      const outBox = document.getElementById('ingest-response');
      outBox.textContent = `Sending POST ${path}...`;

      try {
        const res = await apiFetch(path, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: rawBody
        });
        outBox.textContent = `HTTP ${res.status}\n\n` + (typeof res.body === 'object' ? JSON.stringify(res.body, null, 2) : String(res.body));
        if (res.ok) {
          showToast(`Ingested payload via ${path}`, 'success');
          await refreshAll();
        } else {
          showToast(`Ingest returned HTTP ${res.status}`, 'error');
        }
      } catch (e) {
        outBox.textContent = `Request Error: ${e.message}`;
      }
    }

    function updatePollInterval(val) {
      state.pollIntervalMs = Number(val);
      if (state.pollTimer) clearInterval(state.pollTimer);
      if (state.pollIntervalMs > 0) {
        state.pollTimer = setInterval(() => refreshAll(false), state.pollIntervalMs);
      }
    }

    function escapeHtml(str) {
      return String(str)
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;')
        .replace(/'/g, '&#39;');
    }

    // =========================================================================
    // Native Visual Stream Studio Engine (DAG Canvas, /comms, JSON Sync, AI Hook)
    // =========================================================================
    const studio = {
      palette: [],
      paletteFilter: 'all',
      ruleId: 'stream_pipeline_01',
      nodes: [],
      edges: [],
      selectedNodeId: null,
      selectedEdgeId: null,
      zoom: 1.0,
      pan: { x: 0, y: 0 },
      isPanning: false,
      panStart: { x: 0, y: 0 },
      draggingNodeId: null,
      nodeDragOffset: { x: 0, y: 0 },
      wireDrag: null,
      commsWs: null,
      terminalLines: {},
      droppedCounts: {},
      connectorStatuses: {},
      nodeSeq: 1,
      initialized: false
    };

    async function initStudioIfNeeded() {
      if (studio.initialized) return;
      studio.initialized = true;

      // Rule ID synchronization
      const ruleIdInput = document.getElementById('studio-rule-id');
      if (ruleIdInput) {
        ruleIdInput.addEventListener('input', (e) => {
          studio.ruleId = e.target.value.trim() || 'stream_pipeline_01';
          syncJsonFromCanvas();
        });
      }

      setupCanvasInteractions();
      await loadStudioPalette();
      loadStudioPreset('iot_switch');
      initCommsWebSocket();
    }

    function setupCanvasInteractions() {
      const container = document.getElementById('studio-canvas-container');
      if (!container) return;

      container.addEventListener('wheel', (e) => {
        e.preventDefault();
        const delta = e.deltaY < 0 ? 0.08 : -0.08;
        zoomCanvas(delta);
      }, { passive: false });

      container.addEventListener('mousedown', (e) => {
        if (e.target.closest('.studio-node') || e.target.closest('.canvas-controls') || e.target.closest('.port-dot') || e.target.closest('.studio-wire')) {
          return;
        }
        studio.isPanning = true;
        studio.panStart = { x: e.clientX - studio.pan.x, y: e.clientY - studio.pan.y };
        selectNode(null);
        selectEdge(null);
      });

      window.addEventListener('mousemove', (e) => {
        if (studio.isPanning) {
          studio.pan.x = e.clientX - studio.panStart.x;
          studio.pan.y = e.clientY - studio.panStart.y;
          applyCanvasTransform();
          return;
        }

        if (studio.draggingNodeId) {
          const node = studio.nodes.find(n => n.id === studio.draggingNodeId);
          if (node) {
            const cRect = container.getBoundingClientRect();
            const curCanvasX = (e.clientX - cRect.left - studio.pan.x) / studio.zoom;
            const curCanvasY = (e.clientY - cRect.top - studio.pan.y) / studio.zoom;
            node.x = Math.round(curCanvasX - studio.nodeDragOffset.x);
            node.y = Math.round(curCanvasY - studio.nodeDragOffset.y);
            updateNodeDomPosition(node);
            updateWirePaths();
          }
          return;
        }

        if (studio.wireDrag) {
          const rect = container.getBoundingClientRect();
          const curX = (e.clientX - rect.left - studio.pan.x) / studio.zoom;
          const curY = (e.clientY - rect.top - studio.pan.y) / studio.zoom;
          updateDragWire(curX, curY);
        }
      });

      window.addEventListener('mouseup', () => {
        if (studio.isPanning) studio.isPanning = false;
        if (studio.draggingNodeId) {
          studio.draggingNodeId = null;
          syncJsonFromCanvas();
        }
        if (studio.wireDrag) {
          cancelWireDrag();
        }
      });

      // Canvas drop handling for palette cards
      container.addEventListener('dragover', (e) => e.preventDefault());
      container.addEventListener('drop', (e) => {
        e.preventDefault();
        const raw = e.dataTransfer.getData('text/plain');
        if (!raw) return;
        let nodeType = raw;
        let nodeCat = null;
        try {
          const parsed = JSON.parse(raw);
          if (parsed && parsed.type) {
            nodeType = parsed.type;
            nodeCat = parsed.category;
          }
        } catch (err) {}
        const rect = container.getBoundingClientRect();
        const x = Math.round((e.clientX - rect.left - studio.pan.x) / studio.zoom - 120);
        const y = Math.round((e.clientY - rect.top - studio.pan.y) / studio.zoom - 44);
        addNodeToCanvas(nodeType, x, y, nodeCat);
      });
    }

    function applyCanvasTransform() {
      const nodesLayer = document.getElementById('studio-nodes-layer');
      const svgLayer = document.getElementById('studio-svg-layer');
      const transform = `translate(${studio.pan.x}px, ${studio.pan.y}px) scale(${studio.zoom})`;
      if (nodesLayer) nodesLayer.style.transform = transform;
      if (svgLayer) svgLayer.style.transform = transform;
      const zoomText = document.getElementById('canvas-zoom-level');
      if (zoomText) zoomText.textContent = `${Math.round(studio.zoom * 100)}%`;
    }

    function zoomCanvas(delta) {
      studio.zoom = Math.min(Math.max(studio.zoom + delta, 0.4), 2.2);
      applyCanvasTransform();
    }

    function resetCanvasTransform() {
      studio.zoom = 1.0;
      studio.pan = { x: 40, y: 40 };
      applyCanvasTransform();
    }

    async function loadStudioPalette() {
      try {
        const res = await apiFetch('/api/v1/palette');
        if (res.ok && res.body && Array.isArray(res.body.nodes)) {
          studio.palette = res.body.nodes;
        } else {
          studio.palette = getDefaultPaletteFallback();
        }
      } catch (e) {
        studio.palette = getDefaultPaletteFallback();
      }
      renderPalette(studio.palette);
    }

    const STUDIO_ICONS = {
      radio: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M4.9 19.1C1 15.2 1 8.8 4.9 4.9"/><path d="M7.8 16.2c-2.3-2.3-2.3-6.1 0-8.5"/><circle cx="12" cy="12" r="2"/><path d="M16.2 7.8c2.3 2.3 2.3 6.1 0 8.5"/><path d="M19.1 4.9C23 8.8 23 15.1 19.1 19"/></svg>`,
      cpu: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="4" y="4" width="16" height="16" rx="2"/><rect x="9" y="9" width="6" height="6"/><path d="M9 1v3M15 1v3M9 20v3M15 20v3M20 9h3M20 14h3M1 9h3M1 14h3"/></svg>`,
      server: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="2" width="20" height="8" rx="2"/><rect x="2" y="14" width="20" height="8" rx="2"/><line x1="6" y1="6" x2="6.01" y2="6"/><line x1="6" y1="18" x2="6.01" y2="18"/></svg>`,
      globe: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="2" y1="12" x2="22" y2="12"/><path d="M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z"/></svg>`,
      layers: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="12 2 2 7 12 12 22 7 12 2"/><polyline points="2 17 12 22 22 17"/><polyline points="2 12 12 17 22 12"/></svg>`,
      'play-circle': `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polygon points="10 8 16 12 10 16 10 8"/></svg>`,
      'git-branch': `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="6" y1="3" x2="6" y2="15"/><circle cx="18" cy="6" r="3"/><circle cx="6" cy="18" r="3"/><path d="M18 9a9 9 0 0 1-9 9"/></svg>`,
      shield: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/></svg>`,
      clock: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>`,
      filter: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="22 3 2 3 10 12.46 10 19 14 21 14 12.46 22 3"/></svg>`,
      columns: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 3v18"/><rect x="3" y="3" width="18" height="18" rx="2"/></svg>`,
      box: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 16V8a2 2 0 0 0-1-1.73l-7-4a2 2 0 0 0-2 0l-7 4A2 2 0 0 0 3 8v8a2 2 0 0 0 1 1.73l7 4a2 2 0 0 0 2 0l7-4A2 2 0 0 0 21 16z"/><polyline points="3.27 6.96 12 12.01 20.73 6.96"/><line x1="12" y1="22.08" x2="12" y2="12"/></svg>`,
      database: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><ellipse cx="12" cy="5" rx="9" ry="3"/><path d="M21 12c0 1.66-4 3-9 3s-9-1.34-9-3"/><path d="M3 5v14c0 1.66 4 3 9 3s9-1.34 9-3V5"/></svg>`,
      terminal: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="4 17 10 11 4 5"/><line x1="12" y1="19" x2="20" y2="19"/></svg>`,
      file: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><polyline points="14 2 14 8 20 8"/><line x1="16" y1="13" x2="8" y2="13"/><line x1="16" y1="17" x2="8" y2="17"/></svg>`,
      activity: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="22 12 18 12 15 21 9 3 6 12 2 12"/></svg>`,
      zap: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2"/></svg>`,
      send: `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="22" y1="2" x2="11" y2="13"/><polygon points="22 2 15 22 11 13 2 9 22 2"/></svg>`
    };

    function getStudioIconSvg(nameOrType, category) {
      if (!nameOrType && !category) return STUDIO_ICONS.zap;
      const key = String(nameOrType).toLowerCase().trim();
      if (STUDIO_ICONS[key]) return STUDIO_ICONS[key];

      const typeMap = {
        mqtt: 'radio',
        modbus: 'cpu',
        opcua: 'server',
        httppull: 'globe',
        rest: 'globe',
        kafka: 'layers',
        simulator: 'play-circle',
        switch: 'git-branch',
        rate_limit: 'shield',
        watchdog: 'clock',
        filter: 'filter',
        pick: 'columns',
        window: 'box',
        sql: 'database',
        influx: 'database',
        influx2: 'database',
        tdengine: 'database',
        iotdb: 'database',
        redis: 'layers',
        parquet: 'file',
        file: 'file',
        otlp: 'activity',
        websocket: 'radio',
        log: 'terminal',
        nop: 'zap'
      };

      if (typeMap[key] && STUDIO_ICONS[typeMap[key]]) {
        return STUDIO_ICONS[typeMap[key]];
      }

      if (category === 'source') return STUDIO_ICONS.radio;
      if (category === 'sink') return STUDIO_ICONS.terminal;
      if (category === 'operator') return STUDIO_ICONS.zap;
      return STUDIO_ICONS.zap;
    }

    function getNodeCatColor(category, type) {
      if (type === 'switch') return '#ea580c';
      if (type === 'watchdog') return '#e11d48';
      if (type === 'rate_limit') return '#3b82f6';
      if (category === 'source') return '#0284c7';
      if (category === 'sink') return '#059669';
      return '#6366f1';
    }

    function getDefaultPaletteFallback() {
      return [
        { category: "source", type: "mqtt", label: "MQTT Source", color: "#0284c7", icon: "radio", inputs: 0, outputs: 1, multi_port: false, properties: [{ name: "datasource", type: "string", label: "Topic", default: "demo" }] },
        { category: "source", type: "modbus", label: "Modbus PLC", color: "#0284c7", icon: "cpu", inputs: 0, outputs: 1, multi_port: false, properties: [{ name: "datasource", type: "string", label: "Stream", default: "plc" }] },
        { category: "source", type: "opcua", label: "OPC-UA Source", color: "#0284c7", icon: "server", inputs: 0, outputs: 1, multi_port: false, properties: [{ name: "datasource", type: "string", label: "Stream", default: "opcua" }] },
        { category: "source", type: "httppull", label: "HTTP Pull", color: "#0284c7", icon: "globe", inputs: 0, outputs: 1, multi_port: false, properties: [{ name: "url", type: "string", label: "Endpoint URL", default: "http://127.0.0.1:8080/data" }] },
        { category: "source", type: "kafka", label: "Kafka Source", color: "#0284c7", icon: "layers", inputs: 0, outputs: 1, multi_port: false, properties: [{ name: "brokers", type: "string", label: "Brokers", default: "127.0.0.1:9092" }, { name: "topic", type: "string", label: "Topic", default: "telemetry" }] },
        { category: "source", type: "simulator", label: "Simulator / Mock", color: "#0284c7", icon: "play-circle", inputs: 0, outputs: 1, multi_port: false, properties: [{ name: "interval_ms", type: "number", label: "Interval (ms)", default: 1000 }] },
        { category: "operator", type: "switch", label: "Switch Router", color: "#ea580c", icon: "git-branch", inputs: 1, outputs: 2, multi_port: true, properties: [{ name: "cases", type: "json", label: "Cases", default: [{ case: "temperature > 50", port: 0 }, { case: "temperature <= 50", port: 1 }] }] },
        { category: "operator", type: "rate_limit", label: "Rate Limiter", color: "#3b82f6", icon: "shield", inputs: 1, outputs: 1, multi_port: false, properties: [{ name: "rate_limit", type: "number", label: "Limit (msg/s)", default: 10 }] },
        { category: "operator", type: "watchdog", label: "Watchdog Timeout", color: "#e11d48", icon: "clock", inputs: 1, outputs: 1, multi_port: false, properties: [{ name: "timeout_ms", type: "number", label: "Timeout (ms)", default: 5000 }] },
        { category: "operator", type: "filter", label: "Filter", color: "#6366f1", icon: "filter", inputs: 1, outputs: 1, multi_port: false, properties: [{ name: "expr", type: "string", label: "Expression", default: "temperature > 25" }] },
        { category: "operator", type: "pick", label: "Pick Projection", color: "#6366f1", icon: "columns", inputs: 1, outputs: 1, multi_port: false, properties: [{ name: "fields", type: "string", label: "Fields (comma-separated)", default: "id, ts, value" }] },
        { category: "operator", type: "window", label: "Window Aggregator", color: "#6366f1", icon: "box", inputs: 1, outputs: 1, multi_port: false, properties: [{ name: "window_type", type: "string", label: "Type", default: "tumbling" }] },
        { category: "operator", type: "sql", label: "SQL Transform", color: "#6366f1", icon: "database", inputs: 1, outputs: 1, multi_port: false, properties: [{ name: "sql", type: "string", label: "SQL Query", default: "SELECT * FROM src" }] },
        { category: "sink", type: "mqtt", label: "MQTT Sink", color: "#059669", icon: "radio", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "topic", type: "string", label: "Target Topic", default: "alerts" }] },
        { category: "sink", type: "rest", label: "REST / HTTP Sink", color: "#059669", icon: "globe", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "url", type: "string", label: "URL", default: "http://127.0.0.1:8080/ingest" }] },
        { category: "sink", type: "log", label: "Log Sink", color: "#059669", icon: "terminal", inputs: 1, outputs: 0, multi_port: false, properties: [] },
        { category: "sink", type: "kafka", label: "Kafka Sink", color: "#059669", icon: "layers", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "brokers", type: "string", label: "Brokers", default: "127.0.0.1:9092" }, { name: "topic", type: "string", label: "Topic", default: "rekuiper_out" }] },
        { category: "sink", type: "influx", label: "InfluxDB v1", color: "#059669", icon: "database", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "addr", type: "string", label: "Server URL", default: "http://127.0.0.1:8086" }] },
        { category: "sink", type: "influx2", label: "InfluxDB v2", color: "#059669", icon: "database", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "addr", type: "string", label: "Server URL", default: "http://127.0.0.1:8086" }, { name: "token", type: "string", label: "Token", default: "******" }] },
        { category: "sink", type: "tdengine", label: "TDengine 3.x", color: "#059669", icon: "database", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "host", type: "string", label: "Host", default: "localhost" }, { name: "database", type: "string", label: "DB", default: "power" }] },
        { category: "sink", type: "iotdb", label: "Apache IoTDB", color: "#059669", icon: "database", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "addr", type: "string", label: "Server URL", default: "http://127.0.0.1:18080" }] },
        { category: "sink", type: "opcua", label: "OPC-UA Sink", color: "#059669", icon: "server", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "endpoint", type: "string", label: "Server URL", default: "opc.tcp://127.0.0.1:4840" }] },
        { category: "sink", type: "modbus", label: "Modbus PLC Sink", color: "#059669", icon: "cpu", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "endpoint", type: "string", label: "TCP Endpoint", default: "127.0.0.1:502" }] },
        { category: "sink", type: "redis", label: "Redis Sink", color: "#059669", icon: "layers", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "addr", type: "string", label: "Redis URL", default: "redis://127.0.0.1:6379" }] },
        { category: "sink", type: "parquet", label: "Parquet Rolling Sink", color: "#059669", icon: "file", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "path", type: "string", label: "Directory Path", default: "/data/parquet" }] },
        { category: "sink", type: "otlp", label: "OpenTelemetry OTLP", color: "#059669", icon: "activity", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "endpoint", type: "string", label: "Endpoint", default: "http://127.0.0.1:4318/v1/metrics" }] },
        { category: "sink", type: "websocket", label: "WebSocket Sink", color: "#059669", icon: "radio", inputs: 1, outputs: 0, multi_port: false, properties: [{ name: "addr", type: "string", label: "WS URL", default: "ws://127.0.0.1:9090/ws" }] },
        { category: "sink", type: "nop", label: "NOP Drop", color: "#64748b", icon: "zap", inputs: 1, outputs: 0, multi_port: false, properties: [] }
      ];
    }

    function setPaletteFilter(filter) {
      studio.paletteFilter = filter;
      document.querySelectorAll('.palette-chip').forEach(btn => {
        btn.classList.toggle('active', btn.id === `chip-${filter}`);
      });
      const q = document.getElementById('palette-search')?.value || '';
      filterPalette(q);
    }

    function renderPalette(items) {
      const container = document.getElementById('palette-items-list');
      if (!container) return;

      const cats = {
        source: { title: "Data Sources", items: [] },
        operator: { title: "Stream Processors", items: [] },
        sink: { title: "Data Sinks", items: [] }
      };

      const filter = studio.paletteFilter || 'all';

      for (const item of items) {
        const cat = item.category === 'source' ? 'source' : (item.category === 'sink' ? 'sink' : 'operator');
        if (filter !== 'all' && cat !== filter) continue;
        cats[cat].items.push(item);
      }

      let html = '';
      for (const [k, group] of Object.entries(cats)) {
        if (group.items.length === 0) continue;
        html += `

          <div class="palette-cat-header">

            <span>${escapeHtml(group.title)}</span>

            <span class="badge badge-slate" style="font-size: 10px; padding: 1px 6px;">${group.items.length}</span>

          </div>

        `;
        for (const node of group.items) {
          const catColor = getNodeCatColor(node.category, node.type);
          const svgIcon = getStudioIconSvg(node.icon || node.type, node.category);
          html += `

            <div class="palette-card" draggable="true" ondragstart="event.dataTransfer.setData('text/plain', JSON.stringify({ type: '${node.type}', category: '${node.category}' }))">

              <div class="palette-card-left">

                <div class="palette-icon" style="background: ${catColor}15; color: ${catColor}; border: 1px solid ${catColor}30;">

                  ${svgIcon}

                </div>

                <div>

                  <div class="palette-card-title">${escapeHtml(node.label || node.type)}</div>

                  <div class="palette-card-sub">${escapeHtml(node.type)}</div>

                </div>

              </div>

              <button class="palette-add-btn" onclick="addNodeToCanvasCenter('${node.type}', '${node.category}')" title="Add to canvas">+</button>

            </div>

          `;
        }
      }

      if (!html) {
        html = `<div style="text-align: center; color: #64748b; padding: 28px 10px; font-size: 12px;">No components match filter</div>`;
      }

      container.innerHTML = html;
    }

    function filterPalette(query) {
      const q = query.toLowerCase().trim();
      const allItems = studio.palette && studio.palette.length > 0 ? studio.palette : getDefaultPaletteFallback();
      if (!q) {
        renderPalette(allItems);
        return;
      }
      const filtered = allItems.filter(p =>
        (p.label && p.label.toLowerCase().includes(q)) ||
        (p.type && p.type.toLowerCase().includes(q)) ||
        (p.description && p.description.toLowerCase().includes(q)) ||
        (p.category && p.category.toLowerCase().includes(q))
      );
      renderPalette(filtered);
    }

    function addNodeToCanvasCenter(type, category) {
      const container = document.getElementById('studio-canvas-container');
      const w = container ? container.clientWidth : 800;
      const h = container ? container.clientHeight : 500;
      const x = Math.round((w / 2 - studio.pan.x) / studio.zoom - 120);
      const y = Math.round((h / 2 - studio.pan.y) / studio.zoom - 44);
      addNodeToCanvas(type, x, y, category);
    }

    function addNodeToCanvas(type, x, y, category) {
      const allItems = studio.palette && studio.palette.length > 0 ? studio.palette : getDefaultPaletteFallback();
      const meta = allItems.find(p => p.type === type && (category ? p.category === category : true)) ||
                   allItems.find(p => p.type === type) || {
        type,
        category: category || 'operator',
        label: type,
        color: '#6366f1',
        inputs: 1,
        outputs: 1,
        multi_port: false,
        properties: []
      };

      const finalCat = category || meta.category;
      const catColor = getNodeCatColor(finalCat, meta.type);
      const isSink = finalCat === 'sink';
      const isSource = finalCat === 'source';

      const nodeId = `${type}_${studio.nodeSeq++}`;
      const props = {};
      if (Array.isArray(meta.properties)) {
        for (const p of meta.properties) {
          props[p.name] = p.default !== undefined ? JSON.parse(JSON.stringify(p.default)) : '';
        }
      }

      const node = {
        id: nodeId,
        type: meta.type,
        category: finalCat,
        label: meta.label || meta.type,
        color: catColor,
        icon: meta.icon || meta.type,
        x: Math.max(x, 20),
        y: Math.max(y, 20),
        inputs: isSource ? 0 : (meta.inputs !== undefined ? meta.inputs : 1),
        outputs: isSink ? 0 : (meta.outputs !== undefined ? meta.outputs : 1),
        multi_port: meta.multi_port || (meta.type === 'switch'),
        props,
        metrics: { inTotal: 0, rate: 0 },
        tapActive: false,
        connectorStatus: 'connected'
      };

      studio.nodes.push(node);
      renderNodeDom(node);
      selectNode(node.id);
      syncJsonFromCanvas();
      updateNodeCountBadge();
    }

    function renderNodeDom(node) {
      const layer = document.getElementById('studio-nodes-layer');
      if (!layer) return;

      const catColor = getNodeCatColor(node.category, node.type);
      const div = document.createElement('div');
      div.id = `node-${node.id}`;
      div.className = `studio-node ${studio.selectedNodeId === node.id ? 'selected' : ''}`;
      div.style.left = `${node.x}px`;
      div.style.top = `${node.y}px`;

      let bodySummary = '';
      if (node.type === 'mqtt') bodySummary = `topic: ${node.props.datasource || node.props.topic || 'stream_in'}`;
      else if (node.type === 'modbus') bodySummary = `reg: ${node.props.datasource || 'plc_data'}`;
      else if (node.type === 'opcua') bodySummary = `ep: ${node.props.endpoint || 'opc.tcp://...'}`;
      else if (node.type === 'switch') {
        const cCount = Array.isArray(node.props.cases) ? node.props.cases.length : 2;
        bodySummary = `branch: ${cCount} cases + default`;
      }
      else if (node.type === 'rate_limit') bodySummary = `throttle: ${node.props.rate_limit || 10} msg/s`;
      else if (node.type === 'watchdog') bodySummary = `timeout: ${node.props.timeout_ms || 5000} ms`;
      else if (node.type === 'filter') bodySummary = `expr: ${node.props.expr || 'temp > 25'}`;
      else if (node.type === 'sql') {
        const s = node.props.sql || 'SELECT *';
        bodySummary = `sql: ${s.length > 26 ? s.slice(0, 26) + '...' : s}`;
      }
      else if (node.type === 'window') bodySummary = `window: ${node.props.window_type || 'tumbling'}`;
      else if (node.type === 'log') bodySummary = 'sink: stdout log';
      else if (node.type === 'rest') bodySummary = `url: ${node.props.url || '/ingest'}`;
      else bodySummary = `${node.category} operator`;

      let portsHtml = '';
      if (node.multi_port && node.type === 'switch') {
        const cases = Array.isArray(node.props.cases) ? node.props.cases : [ { case: "case0", port: 0 }, { case: "case1", port: 1 } ];
        portsHtml += `<div class="node-ports-footer">`;
        cases.forEach((c, idx) => {
          const caseLabel = typeof c === 'object' ? (c.case || `case ${idx}`) : String(c);
          portsHtml += `

            <div class="node-port-row">

              <span class="port-label" title="${escapeHtml(caseLabel)}">${escapeHtml(caseLabel)}</span>

              <div class="port-dot output-port" data-node="${node.id}" data-port="${idx}" data-polarity="output" title="Port ${idx}: ${escapeHtml(caseLabel)}" onmousedown="startPortWire(event, '${node.id}', ${idx}, true)"></div>

            </div>`;
        });
        const defPort = cases.length;
        portsHtml += `

          <div class="node-port-row">

            <span class="port-label" style="color: #64748b;">Default fallback</span>

            <div class="port-dot output-port" data-node="${node.id}" data-port="${defPort}" data-polarity="output" title="Default Port: ${defPort}" onmousedown="startPortWire(event, '${node.id}', ${defPort}, true)"></div>

          </div>

        </div>`;
      } else {
        if (node.outputs > 0) {
          portsHtml += `<div class="port-dot output-port" data-node="${node.id}" data-port="0" data-polarity="output" title="Output Port" onmousedown="startPortWire(event, '${node.id}', 0, true)"></div>`;
        }
      }

      if (node.inputs > 0) {
        portsHtml += `<div class="port-dot input-port" data-node="${node.id}" data-port="0" data-polarity="input" title="Input Port" onmouseup="completePortWire(event, '${node.id}', 0)"></div>`;
      }

      const isStreaming = (node.metrics && node.metrics.rate > 0) || node.tapActive;
      const svgIcon = getStudioIconSvg(node.icon || node.type, node.category);

      div.innerHTML = `

        <div class="node-accent-bar" style="background: ${catColor};"></div>

        <div class="studio-node-header">

          <div class="node-icon-wrapper" style="background: ${catColor}18; color: ${catColor}; border: 1px solid ${catColor}33;">

            ${svgIcon}

          </div>

          <div class="node-title-group" style="flex: 1; min-width: 0; margin: 0 8px;">

            <div style="display: flex; align-items: center; gap: 6px;">

              <div class="node-title">${escapeHtml(node.label || node.type)}</div>

              <span class="node-tap-indicator" id="tap-indicator-${node.id}" style="display: ${node.tapActive ? 'inline-flex' : 'none'};">⚡ TAP</span>

            </div>

            <div class="node-type-sub">${escapeHtml(node.type)} · #${escapeHtml(node.id)}</div>

          </div>

          <div class="node-status-dot ${isStreaming ? 'streaming' : ''}" id="status-dot-${node.id}" title="${(node.metrics && node.metrics.rate) || 0} msgs/s"></div>

        </div>

        <div class="studio-node-body">

          <div class="node-summary-pill" title="${escapeHtml(bodySummary)}">${escapeHtml(bodySummary)}</div>

          <div class="node-throughput-badge" id="badge-${node.id}">

            <span class="throughput-val">${(node.metrics && node.metrics.rate) || 0}</span> msg/s

          </div>

        </div>

        ${portsHtml}

      `;

      div.addEventListener('mousedown', (e) => {
        if (e.button !== 0) return;
        if (e.target.closest('.port-dot') || e.target.closest('.port-handle')) return;
        e.stopPropagation();
        selectNode(node.id);
        studio.draggingNodeId = node.id;
        const container = document.getElementById('studio-canvas-container');
        const cRect = container ? container.getBoundingClientRect() : { left: 0, top: 0 };
        const mouseCanvasX = (e.clientX - cRect.left - studio.pan.x) / studio.zoom;
        const mouseCanvasY = (e.clientY - cRect.top - studio.pan.y) / studio.zoom;
        studio.nodeDragOffset = {
          x: mouseCanvasX - node.x,
          y: mouseCanvasY - node.y
        };
      });

      layer.appendChild(div);
    }

    function updateNodeDomPosition(node) {
      const el = document.getElementById(`node-${node.id}`);
      if (el) {
        el.style.left = `${node.x}px`;
        el.style.top = `${node.y}px`;
      }
    }

    function updateNodeCountBadge() {
      const badge = document.getElementById('canvas-node-counter');
      if (badge) {
        badge.textContent = `${studio.nodes.length} nodes · ${studio.edges.length} wires`;
      }
    }

    function selectNode(nodeId) {
      studio.selectedNodeId = nodeId;
      studio.selectedEdgeId = null;

      document.querySelectorAll('.studio-node').forEach(el => {
        el.classList.toggle('selected', el.id === `node-${nodeId}`);
      });
      document.querySelectorAll('.studio-wire').forEach(w => w.classList.remove('selected'));

      const emptyView = document.getElementById('node-inspector-empty');
      const contentView = document.getElementById('node-inspector-content');

      if (!nodeId) {
        if (emptyView) emptyView.style.display = 'block';
        if (contentView) contentView.style.display = 'none';
        return;
      }

      const node = studio.nodes.find(n => n.id === nodeId);
      if (!node) return;

      if (emptyView) emptyView.style.display = 'none';
      if (contentView) contentView.style.display = 'block';

      const catColor = getNodeCatColor(node.category, node.type);
      const catBadge = document.getElementById('insp-node-category');
      if (catBadge) {
        catBadge.textContent = node.category.toUpperCase();
        catBadge.className = `badge badge-${node.category === 'source' ? 'sky' : (node.category === 'sink' ? 'emerald' : 'indigo')}`;
      }

      const titleEl = document.getElementById('insp-node-title');
      if (titleEl) {
        titleEl.innerHTML = `

          <span style="display: inline-flex; align-items: center; gap: 8px;">

            <span style="display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 6px; background: ${catColor}20; color: ${catColor};">

              ${getStudioIconSvg(node.icon || node.type, node.category)}

            </span>

            <span>${escapeHtml(node.label || node.type)}</span>

          </span>

        `;
      }

      const idInput = document.getElementById('insp-node-id');
      if (idInput) idInput.value = node.id;

      renderNodePropsForm(node);
      updateInspectorWireTap(node);
    }

    function renderNodePropsForm(node) {
      const container = document.getElementById('insp-node-props-form');
      if (!container) return;

      let html = '';

      if (node.type === 'sql') {
        const currentSql = node.props.sql || 'SELECT * FROM src';
        html += `

          <div class="form-group">

            <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">

              <label class="form-label" style="color: #94a3b8; font-weight: 600;">SQL Transformation Query</label>

              <span class="badge badge-indigo" style="font-size: 9.5px;">Kuiper SQL Engine</span>

            </div>

            <textarea

              id="sql-editor-textarea"

              class="code-input"

              rows="5"

              style="font-family: var(--font-mono); font-size: 12px; width: 100%;"

              onchange="updateNodeProp('sql', this.value, false)"

              oninput="updateNodeProp('sql', this.value, false)"

            >${escapeHtml(currentSql)}</textarea>

            <div class="code-snippets" style="margin-top: 6px; display: flex; flex-wrap: wrap; gap: 4px;">

              <button class="snippet-btn" onclick="insertSqlSnippet('SELECT *')">+ SELECT *</button>

              <button class="snippet-btn" onclick="insertSqlSnippet('WHERE temperature > 75')">+ WHERE</button>

              <button class="snippet-btn" onclick="insertSqlSnippet('TUMBLINGWINDOW(ss, 10)')">+ Tumbling 10s</button>

              <button class="snippet-btn" onclick="insertSqlSnippet('ORDER BY ts DESC')">+ ORDER BY</button>

            </div>

          </div>

        `;
      } else if (node.type === 'switch') {
        const cases = Array.isArray(node.props.cases) ? node.props.cases : [ { case: "temp > 50", port: 0 }, { case: "temp <= 50", port: 1 } ];
        html += `

          <div class="form-group">

            <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px;">

              <label class="form-label" style="color: #94a3b8; font-weight: 600;">Dynamic Branch Routing Rules</label>

              <button class="btn btn-sm" onclick="addSwitchBranch('${node.id}')" style="background: #1e293b; color: #fb923c; border: 1px solid #ea580c; font-size: 11px; padding: 2px 6px;">+ Add Branch</button>

            </div>

            <div id="switch-branches-list" style="display: flex; flex-direction: column; gap: 6px;">

        `;

        cases.forEach((c, idx) => {
          const expr = typeof c === 'object' ? (c.case || '') : String(c);
          html += `

            <div style="display: flex; align-items: center; gap: 6px; background: #060911; padding: 6px; border: 1px solid #1e293b; border-radius: 6px;">

              <span class="badge badge-orange" style="font-size: 10px; font-family: var(--font-mono); min-width: 48px; text-align: center;">Port ${idx}</span>

              <input

                type="text"

                class="text-input"

                style="flex: 1; font-family: var(--font-mono); font-size: 11.5px; padding: 4px 6px; background: #0f172a; color: #f8fafc; border-color: #23344d;"

                value="${escapeHtml(expr)}"

                placeholder="Expression (e.g. speed > 100)"

                onchange="updateSwitchBranch(${idx}, this.value)"

              />

              <button class="btn btn-sm" onclick="removeSwitchBranch(${idx})" style="background: rgba(239,68,68,0.15); color: #ef4444; border: none; padding: 4px 6px; border-radius: 4px;" title="Remove Branch">✕</button>

            </div>

          `;
        });

        html += `

              <div style="display: flex; align-items: center; gap: 6px; background: #060911; padding: 6px; border: 1px dashed #334155; border-radius: 6px;">

                <span class="badge badge-slate" style="font-size: 10px; font-family: var(--font-mono); min-width: 48px; text-align: center;">Port ${cases.length}</span>

                <span style="flex: 1; font-size: 11.5px; color: #64748b; font-style: italic;">Default Fallback (catches all unmatched tuples)</span>

              </div>

            </div>

          </div>

        `;
      } else if (node.type === 'rate_limit') {
        const rate = node.props.rate_limit || 10;
        html += `

          <div class="form-group">

            <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">

              <label class="form-label" style="color: #94a3b8; font-weight: 600;">Max Message Rate Limit</label>

              <span id="rate-limit-val" style="font-family: var(--font-mono); font-size: 12px; color: #38bdf8; font-weight: 700;">${rate} msg/s</span>

            </div>

            <input

              type="range"

              min="1"

              max="200"

              value="${rate}"

              style="width: 100%; accent-color: #0284c7; margin-bottom: 6px;"

              oninput="document.getElementById('rate-limit-val').textContent = this.value + ' msg/s'; updateNodeProp('rate_limit', Number(this.value), false)"

            />

          </div>

        `;
      } else if (node.type === 'watchdog') {
        const timeout = node.props.timeout_ms || 5000;
        html += `

          <div class="form-group">

            <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px;">

              <label class="form-label" style="color: #94a3b8; font-weight: 600;">Inactivity Timeout (ms)</label>

              <span id="watchdog-val" style="font-family: var(--font-mono); font-size: 12px; color: #f43f5e; font-weight: 700;">${timeout} ms (${timeout / 1000}s)</span>

            </div>

            <input

              type="range"

              min="500"

              max="30000"

              step="500"

              value="${timeout}"

              style="width: 100%; accent-color: #e11d48; margin-bottom: 6px;"

              oninput="document.getElementById('watchdog-val').textContent = this.value + ' ms (' + (this.value/1000) + 's)'; updateNodeProp('timeout_ms', Number(this.value), false)"

            />

          </div>

        `;
      }

      for (const [key, val] of Object.entries(node.props)) {
        if (node.type === 'sql' && key === 'sql') continue;
        if (node.type === 'switch' && key === 'cases') continue;
        if (node.type === 'rate_limit' && key === 'rate_limit') continue;
        if (node.type === 'watchdog' && key === 'timeout_ms') continue;

        const valStr = typeof val === 'object' ? JSON.stringify(val, null, 2) : String(val);
        const isJson = typeof val === 'object';
        html += `

          <div class="form-group">

            <label class="form-label" style="color: #94a3b8; font-family: var(--font-mono); font-size: 11px;">${escapeHtml(key)}</label>

            ${isJson
              ? `<textarea class="text-input" style="background: #060911; color: #f8fafc; border-color: #1e293b; font-family: var(--font-mono); min-height: 80px; font-size: 11.5px;" onchange="updateNodeProp('${key}', this.value, true)">${escapeHtml(valStr)}</textarea>`
              : `<input type="text" class="text-input" style="background: #060911; color: #f8fafc; border-color: #1e293b; font-family: var(--font-mono); font-size: 12px;" value="${escapeHtml(valStr)}" onchange="updateNodeProp('${key}', this.value, false)" />`
            }

          </div>

        `;
      }

      container.innerHTML = html;
    }

    function insertSqlSnippet(snippet) {
      const textarea = document.getElementById('sql-editor-textarea');
      if (!textarea) return;
      textarea.value = textarea.value.trim() + ' ' + snippet;
      updateNodeProp('sql', textarea.value, false);
    }

    function addSwitchBranch(nodeId) {
      const node = studio.nodes.find(n => n.id === nodeId);
      if (!node) return;
      if (!Array.isArray(node.props.cases)) node.props.cases = [];
      const newIdx = node.props.cases.length;
      node.props.cases.push({ case: `status == 'ALERT_${newIdx + 1}'`, port: newIdx });
      node.outputs = node.props.cases.length + 1;

      const domNode = document.getElementById(`node-${node.id}`);
      if (domNode) {
        domNode.remove();
        renderNodeDom(node);
      }
      renderNodePropsForm(node);
      updateWirePaths();
      syncJsonFromCanvas();
    }

    function updateSwitchBranch(idx, newExpr) {
      if (!studio.selectedNodeId) return;
      const node = studio.nodes.find(n => n.id === studio.selectedNodeId);
      if (!node || !Array.isArray(node.props.cases) || !node.props.cases[idx]) return;
      node.props.cases[idx].case = newExpr;
      const domNode = document.getElementById(`node-${node.id}`);
      if (domNode) {
        domNode.remove();
        renderNodeDom(node);
      }
      updateWirePaths();
      syncJsonFromCanvas();
    }

    function removeSwitchBranch(idx) {
      if (!studio.selectedNodeId) return;
      const node = studio.nodes.find(n => n.id === studio.selectedNodeId);
      if (!node || !Array.isArray(node.props.cases) || !node.props.cases[idx]) return;
      node.props.cases.splice(idx, 1);
      node.props.cases.forEach((c, i) => { c.port = i; });
      node.outputs = node.props.cases.length + 1;

      studio.edges = studio.edges.filter(e => !(e.fromNode === node.id && e.fromPort === idx));

      const domNode = document.getElementById(`node-${node.id}`);
      if (domNode) {
        domNode.remove();
        renderNodeDom(node);
      }
      renderNodePropsForm(node);
      updateWirePaths();
      syncJsonFromCanvas();
    }

    function updateNodeProp(key, rawVal, isJson) {
      if (!studio.selectedNodeId) return;
      const node = studio.nodes.find(n => n.id === studio.selectedNodeId);
      if (!node) return;

      try {
        node.props[key] = isJson ? JSON.parse(rawVal) : (isNaN(Number(rawVal)) || rawVal.trim() === '' ? rawVal : Number(rawVal));
      } catch (e) {
        node.props[key] = rawVal;
      }

      const domNode = document.getElementById(`node-${node.id}`);
      if (domNode) {
        domNode.remove();
        renderNodeDom(node);
      }
      updateWirePaths();
      syncJsonFromCanvas();
    }

    function updateSelectedNodeId(newId) {
      const cleanId = newId.trim();
      if (!cleanId || !studio.selectedNodeId) return;
      const oldId = studio.selectedNodeId;
      if (oldId === cleanId) return;

      if (studio.nodes.some(n => n.id === cleanId)) {
        showToast(`Node ID '${cleanId}' already exists`, 'error');
        document.getElementById('insp-node-id').value = oldId;
        return;
      }

      const node = studio.nodes.find(n => n.id === oldId);
      if (!node) return;

      node.id = cleanId;
      studio.selectedNodeId = cleanId;

      for (const e of studio.edges) {
        if (e.fromNode === oldId) e.fromNode = cleanId;
        if (e.toNode === oldId) e.toNode = cleanId;
      }

      renderAllNodes();
      updateWirePaths();
      selectNode(cleanId);
      syncJsonFromCanvas();
    }

    function deleteSelectedNode() {
      if (!studio.selectedNodeId) return;
      const id = studio.selectedNodeId;
      studio.nodes = studio.nodes.filter(n => n.id !== id);
      studio.edges = studio.edges.filter(e => e.fromNode !== id && e.toNode !== id);

      const el = document.getElementById(`node-${id}`);
      if (el) el.remove();

      updateWirePaths();
      selectNode(null);
      syncJsonFromCanvas();
      updateNodeCountBadge();
      showToast(`Deleted node '${id}'`, 'success');
    }

    // Wire Drawing & Connections
    function startPortWire(e, nodeId, portIndex, isOutput) {
      e.stopPropagation();
      studio.wireDrag = {
        fromNodeId: nodeId,
        fromPort: portIndex,
        isOutput: isOutput
      };

      const path = document.getElementById('studio-drag-wire');
      if (path) {
        path.style.display = 'block';
      }
    }

    function updateDragWire(curX, curY) {
      const path = document.getElementById('studio-drag-wire');
      if (!path || !studio.wireDrag) return;

      const fromPt = getPortCoords(studio.wireDrag.fromNodeId, studio.wireDrag.fromPort, studio.wireDrag.isOutput);
      const x1 = fromPt.x;
      const y1 = fromPt.y;
      const x2 = curX;
      const y2 = curY;
      const dx = Math.max(Math.abs(x2 - x1) * 0.5, 45);
      path.setAttribute('d', `M ${x1} ${y1} C ${x1 + dx} ${y1}, ${x2 - dx} ${y2}, ${x2} ${y2}`);
    }

    function completePortWire(e, targetNodeId, targetPortIndex) {
      e.stopPropagation();
      if (!studio.wireDrag) return;

      const srcId = studio.wireDrag.fromNodeId;
      const srcPort = studio.wireDrag.fromPort;
      cancelWireDrag();

      if (srcId === targetNodeId) return;

      const edgeExists = studio.edges.some(e => e.fromNode === srcId && e.fromPort === srcPort && e.toNode === targetNodeId);
      if (edgeExists) return;

      const edgeId = `edge_${srcId}_p${srcPort}_to_${targetNodeId}`;
      studio.edges.push({
        id: edgeId,
        fromNode: srcId,
        fromPort: srcPort,
        toNode: targetNodeId,
        toPort: targetPortIndex || 0
      });

      updateWirePaths();
      syncJsonFromCanvas();
      updateNodeCountBadge();
    }

    function cancelWireDrag() {
      studio.wireDrag = null;
      const path = document.getElementById('studio-drag-wire');
      if (path) path.style.display = 'none';
    }

    function getPortCoords(nodeId, portIndex, isOutput) {
      const node = studio.nodes.find(n => n.id === nodeId);
      if (!node) return { x: 0, y: 0 };

      const el = document.getElementById(`node-${nodeId}`);
      if (el) {
        const portSelector = isOutput
          ? (node.multi_port ? `.output-port[data-port="${portIndex}"]` : '.output-port')
          : '.input-port';
        const dot = el.querySelector(portSelector);
        if (dot) {
          const elRect = el.getBoundingClientRect();
          const dotRect = dot.getBoundingClientRect();
          const x = isOutput ? node.x + 240 : node.x;
          const y = node.y + (dotRect.top - elRect.top) + (dotRect.height / 2);
          return { x, y };
        }
      }

      const nodeW = 240;
      let x = isOutput ? node.x + nodeW : node.x;
      let y = node.y + 44;

      if (isOutput && node.multi_port && node.type === 'switch') {
        const rowHeight = 24;
        const baseOffset = 88;
        y = node.y + baseOffset + (portIndex * rowHeight) + 12;
      }

      return { x, y };
    }

    function updateWirePaths() {
      const group = document.getElementById('studio-wires-group');
      if (!group) return;

      let html = '';
      for (const edge of studio.edges) {
        const fromPt = getPortCoords(edge.fromNode, edge.fromPort, true);
        const toPt = getPortCoords(edge.toNode, edge.toPort, false);
        const dx = Math.max(Math.abs(toPt.x - fromPt.x) * 0.5, 45);
        const d = `M ${fromPt.x} ${fromPt.y} C ${fromPt.x + dx} ${fromPt.y}, ${toPt.x - dx} ${toPt.y}, ${toPt.x} ${toPt.y}`;
        const isSelected = studio.selectedEdgeId === edge.id;
        const marker = isSelected ? 'url(#arrowhead-selected)' : 'url(#arrowhead)';

        html += `

          <path

            class="studio-wire-hit"

            d="${d}"

            stroke="transparent"

            stroke-width="16"

            fill="none"

            style="cursor: pointer;"

            onclick="selectEdge('${edge.id}')"

          />

        `;

        if (isSelected) {
          html += `

            <path

              d="${d}"

              stroke="rgba(249, 115, 22, 0.4)"

              stroke-width="7"

              stroke-linecap="round"

              fill="none"

            />

          `;
        }

        html += `

          <path

            id="${edge.id}"

            class="studio-wire ${isSelected ? 'selected' : ''}"

            d="${d}"

            marker-end="${marker}"

            onclick="selectEdge('${edge.id}')"

          >

            <title>${edge.fromNode} [p${edge.fromPort}] ➔ ${edge.toNode}</title>

          </path>

        `;

        html += `

          <circle r="3" fill="${isSelected ? '#fdba74' : '#f97316'}" opacity="0.85">

            <animateMotion dur="2.4s" repeatCount="indefinite" path="${d}" />

          </circle>

        `;
      }
      group.innerHTML = html;
    }

    function selectEdge(edgeId) {
      studio.selectedEdgeId = edgeId;
      updateWirePaths();
    }

    function deleteSelectedEdge() {
      if (!studio.selectedEdgeId) return;
      studio.edges = studio.edges.filter(e => e.id !== studio.selectedEdgeId);
      studio.selectedEdgeId = null;
      updateWirePaths();
      syncJsonFromCanvas();
      updateNodeCountBadge();
    }

    function updateStudioThroughputFromRule(ruleId) {
      if (!ruleId || !studio.nodes || studio.nodes.length === 0) return;
      const inRate = (state.rates && state.rates.perRuleIn && state.rates.perRuleIn[ruleId]) || 0;
      const outRate = (state.rates && state.rates.perRuleOut && state.rates.perRuleOut[ruleId]) || 0;
      const m = (state.ruleMetrics && state.ruleMetrics[ruleId]) || {};
      const sumIn = extractMetricSum(m, 'records_in_total');
      const sumOut = extractMetricSum(m, 'records_out_total');

      for (const node of studio.nodes) {
        if (node.category === 'source') {
          node.metrics.rate = inRate;
          node.metrics.inTotal = sumIn;
        } else if (node.category === 'sink') {
          node.metrics.rate = outRate;
          node.metrics.inTotal = sumOut;
        } else {
          node.metrics.rate = inRate;
          node.metrics.inTotal = sumIn;
        }

        const badge = document.getElementById(`badge-${node.id}`);
        if (badge) {
          badge.innerHTML = `<span class="throughput-val">${node.metrics.rate}</span> msg/s`;
        }

        const statusDot = document.getElementById(`status-dot-${node.id}`);
        if (statusDot) {
          statusDot.classList.toggle('streaming', node.metrics.rate > 0 || node.tapActive);
          statusDot.title = `${node.metrics.rate} msgs/s (${node.metrics.inTotal} total)`;
        }
      }
    }

    window.addEventListener('keydown', (e) => {
      if (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA') return;
      if (e.key === 'Delete' || e.key === 'Backspace') {
        if (studio.selectedEdgeId) deleteSelectedEdge();
        else if (studio.selectedNodeId) deleteSelectedNode();
      }
    });

    // Auto Layout (Topological Column Arrangement)
    function autoLayoutNodes() {
      if (studio.nodes.length === 0) return;

      const layers = { sources: [], operators: [], sinks: [] };
      for (const n of studio.nodes) {
        if (n.category === 'source') layers.sources.push(n);
        else if (n.category === 'sink') layers.sinks.push(n);
        else layers.operators.push(n);
      }

      const colWidth = 330;
      const rowHeight = 125;
      const startX = 60;
      const startY = 60;

      // Col 0: Sources
      layers.sources.forEach((n, idx) => {
        n.x = startX;
        n.y = startY + (idx * (rowHeight + 30));
        updateNodeDomPosition(n);
      });

      // Intermediate columns: Operators
      layers.operators.forEach((n, idx) => {
        n.x = startX + colWidth;
        n.y = startY + (idx * (rowHeight + 40));
        updateNodeDomPosition(n);
      });

      // Final column: Sinks
      const sinkCol = layers.operators.length > 0 ? startX + (colWidth * 2) : startX + colWidth;
      layers.sinks.forEach((n, idx) => {
        n.x = sinkCol;
        n.y = startY + (idx * (rowHeight + 30));
        updateNodeDomPosition(n);
      });

      resetCanvasTransform();
      updateWirePaths();
      syncJsonFromCanvas();
      showToast('Nodes auto-aligned into DAG columns', 'success');
    }

    function clearStudioCanvas() {
      studio.nodes = [];
      studio.edges = [];
      studio.selectedNodeId = null;
      studio.selectedEdgeId = null;
      const layer = document.getElementById('studio-nodes-layer');
      if (layer) layer.innerHTML = '';
      updateWirePaths();
      selectNode(null);
      syncJsonFromCanvas();
      updateNodeCountBadge();
      showToast('Canvas cleared', 'success');
    }

    function renderAllNodes() {
      const layer = document.getElementById('studio-nodes-layer');
      if (!layer) return;
      layer.innerHTML = '';
      for (const node of studio.nodes) {
        renderNodeDom(node);
      }
      updateWirePaths();
      updateNodeCountBadge();
    }

    // Two-Way GraphRule JSON Sync
    function serializeGraphToJson() {
      const nodesObj = {};
      const sourcesList = [];
      const edgesObj = {};

      for (const node of studio.nodes) {
        nodesObj[node.id] = {
          type: node.type,
          node_type: node.category,
          props: node.props
        };
        if (node.category === 'source') {
          sourcesList.push(node.id);
        }
      }

      // Group outgoing edges by source node and port
      for (const node of studio.nodes) {
        const outEdges = studio.edges.filter(e => e.fromNode === node.id);
        if (outEdges.length === 0) continue;

        if (node.multi_port && node.type === 'switch') {
          const cases = Array.isArray(node.props.cases) ? node.props.cases : [0, 1];
          const numPorts = cases.length + 1; // cases + default
          const portBuckets = Array.from({ length: numPorts }, () => []);

          for (const edge of outEdges) {
            const p = edge.fromPort || 0;
            if (p < numPorts) {
              portBuckets[p].push(edge.toNode);
            }
          }
          edgesObj[node.id] = portBuckets;
        } else {
          if (outEdges.length === 1) {
            edgesObj[node.id] = outEdges[0].toNode;
          } else {
            edgesObj[node.id] = [ outEdges.map(e => e.toNode) ];
          }
        }
      }

      return {
        id: studio.ruleId,
        graph: {
          nodes: nodesObj,
          topo: {
            sources: sourcesList,
            edges: edgesObj
          }
        }
      };
    }

    function syncJsonFromCanvas() {
      const editor = document.getElementById('studio-json-editor');
      if (!editor) return;
      const graphDef = serializeGraphToJson();
      editor.value = JSON.stringify(graphDef, null, 2);
    }

    function formatStudioJson() {
      const editor = document.getElementById('studio-json-editor');
      if (!editor) return;
      try {
        const parsed = JSON.parse(editor.value);
        editor.value = JSON.stringify(parsed, null, 2);
      } catch (e) {
        showToast(`JSON Syntax Error: ${e.message}`, 'error');
      }
    }

    function applyJsonToCanvas() {
      const editor = document.getElementById('studio-json-editor');
      if (!editor) return;

      try {
        const parsed = JSON.parse(editor.value);
        if (!parsed || !parsed.graph || !parsed.graph.nodes) {
          showToast('Invalid GraphRule format: missing graph.nodes', 'error');
          return;
        }

        studio.ruleId = parsed.id || 'stream_pipeline_01';
        const ruleIdInput = document.getElementById('studio-rule-id');
        if (ruleIdInput) ruleIdInput.value = studio.ruleId;

        studio.nodes = [];
        studio.edges = [];

        // Build nodes
        const rawNodes = parsed.graph.nodes;
        for (const [id, def] of Object.entries(rawNodes)) {
          const type = def.type || 'sql';
          const meta = studio.palette.find(p => p.type === type) || {
            type,
            category: def.node_type || 'operator',
            label: type,
            color: '#6366f1',
            inputs: 1,
            outputs: 1,
            multi_port: false
          };

          const cat = def.node_type || meta.category;
          const nodeColor = getNodeCatColor(cat, type);

          studio.nodes.push({
            id,
            type,
            category: cat,
            label: meta.label || type,
            color: nodeColor,
            icon: meta.icon || type,
            x: 60,
            y: 60,
            inputs: meta.inputs !== undefined ? meta.inputs : 1,
            outputs: meta.outputs !== undefined ? meta.outputs : 1,
            multi_port: meta.multi_port || (type === 'switch'),
            props: def.props || {},
            metrics: { inTotal: 0, rate: 0 },
            tapActive: false,
            connectorStatus: 'connected'
          });
        }

        // Build edges
        const rawEdges = (parsed.graph.topo && parsed.graph.topo.edges) ? parsed.graph.topo.edges : {};
        for (const [fromNode, target] of Object.entries(rawEdges)) {
          if (typeof target === 'string') {
            studio.edges.push({
              id: `edge_${fromNode}_to_${target}`,
              fromNode,
              fromPort: 0,
              toNode: target,
              toPort: 0
            });
          } else if (Array.isArray(target)) {
            // Check if array of strings or array of arrays
            if (target.length > 0 && Array.isArray(target[0])) {
              // Multi-port EdgeTargets::Multi: [ ["sink0"], ["sink1"] ]
              target.forEach((portTargets, pIdx) => {
                if (Array.isArray(portTargets)) {
                  for (const t of portTargets) {
                    studio.edges.push({
                      id: `edge_${fromNode}_p${pIdx}_to_${t}`,
                      fromNode,
                      fromPort: pIdx,
                      toNode: t,
                      toPort: 0
                    });
                  }
                }
              });
            } else {
              // Flat array of strings
              for (const t of target) {
                if (typeof t === 'string') {
                  studio.edges.push({
                    id: `edge_${fromNode}_to_${t}`,
                    fromNode,
                    fromPort: 0,
                    toNode: t,
                    toPort: 0
                  });
                }
              }
            }
          }
        }

        renderAllNodes();
        autoLayoutNodes();
        updateStudioThroughputFromRule(studio.ruleId);
        showToast('Applied JSON to DAG canvas', 'success');
      } catch (e) {
        showToast(`Failed to parse GraphRule JSON: ${e.message}`, 'error');
      }
    }

    function validateStudioGraph() {
      if (studio.nodes.length === 0) {
        showToast('Validation failed: Canvas contains 0 nodes', 'error');
        return false;
      }
      const hasSource = studio.nodes.some(n => n.category === 'source');
      const hasSink = studio.nodes.some(n => n.category === 'sink');

      if (!hasSource) {
        showToast('Validation warning: Pipeline has no Source node', 'error');
        return false;
      }
      if (!hasSink) {
        showToast('Validation warning: Pipeline has no Sink node', 'error');
        return false;
      }

      showToast(`Topology valid: ${studio.nodes.length} nodes, ${studio.edges.length} wires`, 'success');
      return true;
    }

    async function deployStudioPipeline() {
      if (!validateStudioGraph()) return;
      const graphDef = serializeGraphToJson();
      const ruleId = studio.ruleId;
      const ruleExists = Array.isArray(state.rules) && state.rules.some(r => r.id === ruleId);
      const method = ruleExists ? 'PUT' : 'POST';
      const endpoint = ruleExists ? `/rules/${encodeURIComponent(ruleId)}` : '/rules';

      try {
        const res = await apiFetch(endpoint, {
          method,
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(graphDef)
        });

        if (res.ok) {
          showToast(`🚀 Rule '${ruleId}' ${ruleExists ? 'updated (PUT)' : 'deployed (POST)'} successfully`, 'success');
          await refreshAll();
        } else {
          const msg = res.body && res.body.message ? res.body.message : `HTTP ${res.status}`;
          showToast(`Deployment error: ${msg}`, 'error');
        }
      } catch (e) {
        showToast(`Deploy request failed: ${e.message}`, 'error');
      }
    }

    async function loadRuleIntoStudio(ruleId) {
      if (!ruleId) return;
      initStudioIfNeeded();
      switchTab('studio');

      try {
        const res = await apiFetch(`/rules/${encodeURIComponent(ruleId)}`);
        if (!res.ok || !res.body) {
          showToast(`Failed to load rule '${ruleId}': HTTP ${res.status}`, 'error');
          return;
        }

        const ruleDef = res.body;
        studio.ruleId = ruleDef.id || ruleId;
        const ruleIdInput = document.getElementById('studio-rule-id');
        if (ruleIdInput) ruleIdInput.value = studio.ruleId;

        if (ruleDef.graph && ruleDef.graph.nodes) {
          const editor = document.getElementById('studio-json-editor');
          if (editor) editor.value = JSON.stringify(ruleDef, null, 2);
          applyJsonToCanvas();
          showToast(`Loaded GraphRule '${ruleId}' into Studio`, 'success');
        } else {
          clearStudioCanvas();
          studio.ruleId = ruleDef.id || ruleId;
          if (ruleIdInput) ruleIdInput.value = studio.ruleId;

          const sql = ruleDef.sql || '';
          const fromMatch = sql.match(/\bFROM\s+([a-zA-Z0-9_]+)/i);
          const streamName = fromMatch ? fromMatch[1] : 'stream_input';

          // 1. Source node
          const srcId = `${streamName}_source`;
          addNodeToCanvas('mqtt', 80, 120);
          const srcNode = studio.nodes[studio.nodes.length - 1];
          srcNode.id = srcId;
          srcNode.props.datasource = streamName;
          srcNode.props.topic = streamName;

          // 2. SQL node
          const sqlId = 'sql_processor';
          addNodeToCanvas('sql', 380, 120);
          const sqlNode = studio.nodes[studio.nodes.length - 1];
          sqlNode.id = sqlId;
          sqlNode.props.sql = sql;

          studio.edges.push({
            id: `edge_${srcId}_to_${sqlId}`,
            fromNode: srcId,
            fromPort: 0,
            toNode: sqlId,
            toPort: 0
          });

          // 3. Sinks
          const actions = Array.isArray(ruleDef.actions) ? ruleDef.actions : [];
          if (actions.length > 0) {
            actions.forEach((act, idx) => {
              const actKey = Object.keys(act)[0] || 'log';
              const actProps = act[actKey] || {};
              const sinkId = `${actKey}_sink_${idx + 1}`;
              const sinkType = (actKey === 'mqtt' || actKey === 'rest' || actKey === 'log' || actKey === 'kafka') ? actKey : 'rest';
              addNodeToCanvas(sinkType, 680, 80 + idx * 100);
              const sinkNode = studio.nodes[studio.nodes.length - 1];
              sinkNode.id = sinkId;
              sinkNode.props = Object.assign({}, actProps);

              studio.edges.push({
                id: `edge_${sqlId}_to_${sinkId}`,
                fromNode: sqlId,
                fromPort: 0,
                toNode: sinkId,
                toPort: 0
              });
            });
          } else {
            const sinkId = 'log_sink';
            addNodeToCanvas('log', 680, 120);
            const sinkNode = studio.nodes[studio.nodes.length - 1];
            sinkNode.id = sinkId;
            studio.edges.push({
              id: `edge_${sqlId}_to_${sinkId}`,
              fromNode: sqlId,
              fromPort: 0,
              toNode: sinkId,
              toPort: 0
            });
          }

          renderAllNodes();
          autoLayoutNodes();
          syncJsonFromCanvas();
          updateStudioThroughputFromRule(ruleId);
          showToast(`Constructed DAG for SQL Rule '${ruleId}' in Studio`, 'success');
        }
      } catch (e) {
        showToast(`Error loading rule into Studio: ${e.message}`, 'error');
      }
    }

    function switchDrawerTab(tab) {
      document.querySelectorAll('.drawer-tab').forEach(b => b.classList.toggle('active', b.id === `drawer-tab-${tab}`));
      document.querySelectorAll('.drawer-pane').forEach(p => p.classList.toggle('active', p.id === `drawer-pane-${tab}`));
      if (tab === 'json') {
        syncJsonFromCanvas();
      }
    }

    // Presets Loader
    function loadStudioPreset(presetKey) {
      if (!presetKey) return;
      clearStudioCanvas();

      if (presetKey === 'iot_switch') {
        studio.ruleId = 'iiot_switch_pipeline';
        document.getElementById('studio-rule-id').value = studio.ruleId;
        addNodeToCanvas('mqtt', 60, 100, 'source');
        addNodeToCanvas('switch', 340, 90, 'operator');
        addNodeToCanvas('mqtt', 680, 50, 'sink');
        addNodeToCanvas('log', 680, 200, 'sink');

        const [src, sw, snk1, snk2] = studio.nodes;
        src.id = 'mqtt_plc_in';
        src.props.datasource = 'factory/turbines';
        sw.id = 'switch_router';
        sw.props.cases = [
          { case: "temperature > 75", port: 0 },
          { case: "temperature <= 75", port: 1 }
        ];
        snk1.id = 'alert_sink';
        snk1.props.topic = 'alarms/high_temp';
        snk2.id = 'audit_log';

        studio.edges = [
          { id: 'e1', fromNode: 'mqtt_plc_in', fromPort: 0, toNode: 'switch_router', toPort: 0 },
          { id: 'e2', fromNode: 'switch_router', fromPort: 0, toNode: 'alert_sink', toPort: 0 },
          { id: 'e3', fromNode: 'switch_router', fromPort: 1, toNode: 'audit_log', toPort: 0 }
        ];
      } else if (presetKey === 'rate_limited') {
        studio.ruleId = 'rate_limited_plc';
        document.getElementById('studio-rule-id').value = studio.ruleId;
        addNodeToCanvas('modbus', 60, 100, 'source');
        addNodeToCanvas('rate_limit', 340, 100, 'operator');
        addNodeToCanvas('filter', 620, 100, 'operator');
        addNodeToCanvas('rest', 900, 100, 'sink');

        const [src, rl, flt, snk] = studio.nodes;
        src.id = 'modbus_feed';
        rl.id = 'token_bucket_throttle';
        rl.props.rate_limit = 10.0;
        flt.id = 'pressure_check';
        flt.props.expr = 'pressure > 100';
        snk.id = 'rest_webhook';

        studio.edges = [
          { id: 'e1', fromNode: src.id, fromPort: 0, toNode: rl.id, toPort: 0 },
          { id: 'e2', fromNode: rl.id, fromPort: 0, toNode: flt.id, toPort: 0 },
          { id: 'e3', fromNode: flt.id, fromPort: 0, toNode: snk.id, toPort: 0 }
        ];
      } else if (presetKey === 'watchdog_alarm') {
        studio.ruleId = 'watchdog_inactivity_rule';
        document.getElementById('studio-rule-id').value = studio.ruleId;
        addNodeToCanvas('mqtt', 60, 100, 'source');
        addNodeToCanvas('watchdog', 340, 100, 'operator');
        addNodeToCanvas('rest', 620, 100, 'sink');

        const [src, wd, snk] = studio.nodes;
        src.id = 'heartbeat_in';
        src.props.datasource = 'edge/ping';
        wd.id = 'silence_detector';
        wd.props.timeout_ms = 5000;
        snk.id = 'pagerduty_webhook';

        studio.edges = [
          { id: 'e1', fromNode: src.id, fromPort: 0, toNode: wd.id, toPort: 0 },
          { id: 'e2', fromNode: wd.id, fromPort: 0, toNode: snk.id, toPort: 0 }
        ];
      } else if (presetKey === 'window_agg') {
        studio.ruleId = 'windowed_telemetry_agg';
        document.getElementById('studio-rule-id').value = studio.ruleId;
        addNodeToCanvas('simulator', 60, 100, 'source');
        addNodeToCanvas('window', 340, 100, 'operator');
        addNodeToCanvas('sql', 620, 100, 'operator');
        addNodeToCanvas('parquet', 900, 100, 'sink');

        const [src, win, sql, snk] = studio.nodes;
        src.id = 'sim_sensor';
        win.id = 'tumbling_window';
        win.props.window_type = 'tumbling';
        win.props.length = 10000;
        sql.id = 'calc_avg';
        sql.props.sql = 'SELECT avg(temperature) AS avg_temp FROM sim_sensor';
        snk.id = 'parquet_file';

        studio.edges = [
          { id: 'e1', fromNode: src.id, fromPort: 0, toNode: win.id, toPort: 0 },
          { id: 'e2', fromNode: win.id, fromPort: 0, toNode: sql.id, toPort: 0 },
          { id: 'e3', fromNode: sql.id, fromPort: 0, toNode: snk.id, toPort: 0 }
        ];
      }

      renderAllNodes();
      autoLayoutNodes();
      if (studio.nodes.length > 0) selectNode(studio.nodes[0].id);
      showToast(`Loaded template '${presetKey}'`, 'success');
    }

    // Natural-Language-to-Graph AI Assistant Hook
    function synthesizeGraphFromPrompt() {
      const input = document.getElementById('studio-ai-prompt');
      const prompt = input ? input.value.trim() : '';
      if (!prompt) {
        showToast('Please enter a natural language pipeline description', 'error');
        return;
      }

      const pLower = prompt.toLowerCase();
      clearStudioCanvas();

      studio.ruleId = 'ai_synthesized_flow';
      const ruleIdInput = document.getElementById('studio-rule-id');
      if (ruleIdInput) ruleIdInput.value = studio.ruleId;

      // 1. Detect Source
      let srcType = 'mqtt';
      let srcTopic = 'factory/telemetry';
      if (pLower.includes('modbus') || pLower.includes('plc')) {
        srcType = 'modbus';
      } else if (pLower.includes('opcua') || pLower.includes('opc-ua')) {
        srcType = 'opcua';
      } else if (pLower.includes('kafka')) {
        srcType = 'kafka';
      } else if (pLower.includes('http') || pLower.includes('pull') || pLower.includes('rest')) {
        srcType = 'httppull';
      }

      addNodeToCanvas(srcType, 60, 100, 'source');
      const srcNode = studio.nodes[0];
      srcNode.id = `${srcType}_source`;
      if (srcType === 'mqtt') srcNode.props.datasource = srcTopic;

      let lastNodeId = srcNode.id;

      // 2. Detect Rate Limiting
      if (pLower.includes('rate limit') || pLower.includes('throttle') || pLower.includes('token')) {
        addNodeToCanvas('rate_limit', 340, 100, 'operator');
        const rlNode = studio.nodes[studio.nodes.length - 1];
        rlNode.id = 'rate_limiter';
        const m = pLower.match(/(\d+)\s*(?:msg|msgs|rec|tuples)?(?:\s*\/\s*|\s*per\s*)s/);
        if (m) rlNode.props.rate_limit = Number(m[1]);
        studio.edges.push({ id: `e_${lastNodeId}_to_${rlNode.id}`, fromNode: lastNodeId, fromPort: 0, toNode: rlNode.id, toPort: 0 });
        lastNodeId = rlNode.id;
      }

      // 3. Detect Watchdog Inactivity
      if (pLower.includes('watchdog') || pLower.includes('timeout') || pLower.includes('inactivity')) {
        addNodeToCanvas('watchdog', 340, 100, 'operator');
        const wdNode = studio.nodes[studio.nodes.length - 1];
        wdNode.id = 'watchdog_monitor';
        const m = pLower.match(/(\d+)\s*(?:s|sec|seconds)/);
        if (m) wdNode.props.timeout_ms = Number(m[1]) * 1000;
        studio.edges.push({ id: `e_${lastNodeId}_to_${wdNode.id}`, fromNode: lastNodeId, fromPort: 0, toNode: wdNode.id, toPort: 0 });
        lastNodeId = wdNode.id;
      }

      // 4. Detect Window / Aggregator
      if (pLower.includes('window') || pLower.includes('tumbling') || pLower.includes('aggregate')) {
        addNodeToCanvas('window', 340, 100, 'operator');
        const winNode = studio.nodes[studio.nodes.length - 1];
        winNode.id = 'tumbling_window';
        studio.edges.push({ id: `e_${lastNodeId}_to_${winNode.id}`, fromNode: lastNodeId, fromPort: 0, toNode: winNode.id, toPort: 0 });
        lastNodeId = winNode.id;
      }

      // 5. Detect Routing / Switch / Filter
      const isSwitch = pLower.includes('switch') || pLower.includes('route') || pLower.includes('branch') || (pLower.includes('else') && pLower.includes('>'));
      if (isSwitch) {
        addNodeToCanvas('switch', 400, 100, 'operator');
        const swNode = studio.nodes[studio.nodes.length - 1];
        swNode.id = 'switch_router';

        let predicate = "temperature > 70";
        const predMatch = prompt.match(/([a-zA-Z_0-9]+)\s*(>|<|>=|<=|==|=)\s*(\d+(?:\.\d+)?)/);
        if (predMatch) {
          predicate = `${predMatch[1]} ${predMatch[2]} ${predMatch[3]}`;
        }
        swNode.props.cases = [
          { case: predicate, port: 0 },
          { case: `NOT (${predicate})`, port: 1 }
        ];

        studio.edges.push({ id: `e_${lastNodeId}_to_${swNode.id}`, fromNode: lastNodeId, fromPort: 0, toNode: swNode.id, toPort: 0 });

        // High / Critical Sink
        addNodeToCanvas('mqtt', 700, 50, 'sink');
        const alertSink = studio.nodes[studio.nodes.length - 1];
        alertSink.id = 'critical_alerts';
        alertSink.props.topic = 'alerts/critical';

        // Normal / Default Sink
        const normSinkType = pLower.includes('log') ? 'log' : (pLower.includes('timescale') || pLower.includes('rest') ? 'rest' : 'mqtt');
        addNodeToCanvas(normSinkType, 700, 180, 'sink');
        const normalSink = studio.nodes[studio.nodes.length - 1];
        normalSink.id = 'normal_telemetry';

        studio.edges.push({ id: 'e_sw_p0', fromNode: swNode.id, fromPort: 0, toNode: alertSink.id, toPort: 0 });
        studio.edges.push({ id: 'e_sw_p1', fromNode: swNode.id, fromPort: 1, toNode: normalSink.id, toPort: 0 });
      } else {
        // Standard Filter
        if (pLower.includes('filter') || pLower.includes('where') || pLower.includes('>') || pLower.includes('<')) {
          addNodeToCanvas('filter', 400, 100, 'operator');
          const fltNode = studio.nodes[studio.nodes.length - 1];
          fltNode.id = 'filter_eval';
          const predMatch = prompt.match(/([a-zA-Z_0-9]+)\s*(>|<|>=|<=|==|=)\s*(\d+(?:\.\d+)?)/);
          if (predMatch) fltNode.props.expr = `${predMatch[1]} ${predMatch[2]} ${predMatch[3]}`;
          studio.edges.push({ id: `e_${lastNodeId}_to_${fltNode.id}`, fromNode: lastNodeId, fromPort: 0, toNode: fltNode.id, toPort: 0 });
          lastNodeId = fltNode.id;
        }

        // Single Sink
        let sinkType = 'mqtt';
        if (pLower.includes('kafka')) sinkType = 'kafka';
        else if (pLower.includes('rest') || pLower.includes('webhook') || pLower.includes('http')) sinkType = 'rest';
        else if (pLower.includes('log')) sinkType = 'log';
        else if (pLower.includes('file')) sinkType = 'file';

        addNodeToCanvas(sinkType, 700, 100, 'sink');
        const sinkNode = studio.nodes[studio.nodes.length - 1];
        sinkNode.id = `${sinkType}_sink`;
        studio.edges.push({ id: `e_${lastNodeId}_to_${sinkNode.id}`, fromNode: lastNodeId, fromPort: 0, toNode: sinkNode.id, toPort: 0 });
      }

      renderAllNodes();
      autoLayoutNodes();
      if (studio.nodes.length > 0) selectNode(studio.nodes[0].id);
      showToast(`✨ Synthesized ${studio.nodes.length}-node pipeline from prompt`, 'success');
    }

    // Live /comms WebSocket and Wire-Tap
    function initCommsWebSocket() {
      if (studio.commsWs) return;

      const wsProto = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
      const wsUrl = `${wsProto}//${window.location.host}/comms`;

      try {
        const ws = new WebSocket(wsUrl);
        studio.commsWs = ws;

        ws.onopen = () => {
          // Connected to CommsHub
        };

        ws.onmessage = (evt) => {
          try {
            const msg = JSON.parse(evt.data);
            handleCommsEvent(msg);
          } catch (e) {
            // Ignore non-json frames
          }
        };

        ws.onclose = () => {
          studio.commsWs = null;
          // Retry connection after delay
          setTimeout(initCommsWebSocket, 4000);
        };

        ws.onerror = () => {
          // Fallback gracefully without breaking UI
        };
      } catch (e) {
        // WebSocket unavailable in isolated test runners
      }
    }

    function handleCommsEvent(msg) {
      if (!msg || typeof msg !== 'object') return;

      const eventType = msg.type || msg.event;

      if (eventType === 'tuple_sample') {
        const nodeId = msg.node_id;
        const node = studio.nodes.find(n => n.id === nodeId);
        if (node) {
          if (!node.metrics) node.metrics = { rate: 0, inTotal: 0 };
          node.metrics.inTotal = (node.metrics.inTotal || 0) + 1;
          const badge = document.getElementById(`badge-${node.id}`);
          if (badge) badge.innerHTML = `<span class="throughput-val">${node.metrics.inTotal}</span> msgs`;
          const dot = document.getElementById(`status-dot-${node.id}`);
          if (dot) dot.classList.add('streaming');
        }

        const droppedCount = msg.dropped_since_last !== undefined ? msg.dropped_since_last : (msg.dropped_count || 0);
        studio.droppedCounts[nodeId] = (studio.droppedCounts[nodeId] || 0) + droppedCount;
        if (studio.selectedNodeId === nodeId) {
          const dropEl = document.getElementById('insp-tap-dropped-badge');
          if (dropEl) dropEl.textContent = `Dropped: ${studio.droppedCounts[nodeId]}`;
        }

        const recData = msg.data !== undefined ? msg.data : (msg.record !== undefined ? msg.record : msg);
        const nowStr = new Date().toISOString().split('T')[1].replace('Z', '');
        const portStr = msg.port !== undefined ? `[P${msg.port}] ` : '';
        const line = `[${nowStr}] ${portStr}${JSON.stringify(recData)}`;

        if (!studio.terminalLines[nodeId]) studio.terminalLines[nodeId] = [];
        studio.terminalLines[nodeId].push(line);
        if (studio.terminalLines[nodeId].length > 60) studio.terminalLines[nodeId].shift();

        if (studio.selectedNodeId === nodeId) {
          const terminal = document.getElementById('insp-tap-terminal');
          if (terminal) {
            terminal.textContent = studio.terminalLines[nodeId].join('\n');
            terminal.scrollTop = terminal.scrollHeight;
          }
        }

        // Animate connected outgoing wires to visually show data flowing
        const connectedWires = studio.edges.filter(e => e.fromNode === nodeId && (msg.port === undefined || e.fromPort === msg.port));
        connectedWires.forEach(edge => {
          const wireEl = document.getElementById(`wire-${edge.id}`);
          if (wireEl) {
            wireEl.classList.add('active-stream');
            setTimeout(() => {
              if (node && !node.tapActive) wireEl.classList.remove('active-stream');
            }, 1000);
          }
        });
      } else if (eventType === 'connector_status') {
        const status = msg.status || 'connected';
        const srcType = msg.source_type || msg.kind || msg.id || '';
        studio.connectorStatuses[srcType] = status;

        if (studio.selectedNodeId) {
          const selNode = studio.nodes.find(n => n.id === studio.selectedNodeId);
          if (selNode && (selNode.type === srcType || selNode.id.includes(srcType))) {
            const statVal = document.getElementById('insp-connector-status-val');
            if (statVal) {
              statVal.textContent = status.toUpperCase();
              statVal.style.color = status.toLowerCase() === 'connected' ? '#10B981' : '#EF4444';
            }
          }
        }
      }
    }

    function updateInspectorWireTap(node) {
      const toggleBtn = document.getElementById('insp-tap-toggle-btn');
      const statusPill = document.getElementById('insp-tap-status-pill');
      const droppedBadge = document.getElementById('insp-tap-dropped-badge');
      const connRow = document.getElementById('insp-connector-status-row');
      const terminal = document.getElementById('insp-tap-terminal');

      const isTapped = !!node.tapActive;
      if (toggleBtn) {
        toggleBtn.textContent = isTapped ? '⏹ Disable Tap' : '⚡ Enable Tap';
        toggleBtn.style.background = isTapped ? '#334155' : '#ea580c';
      }

      if (statusPill) {
        statusPill.textContent = isTapped ? 'Streaming' : 'Standby';
        statusPill.className = `badge badge-${isTapped ? 'emerald' : 'slate'}`;
      }

      if (droppedBadge) {
        droppedBadge.textContent = `Dropped: ${studio.droppedCounts[node.id] || 0}`;
      }

      if (connRow) {
        if (node.category === 'source' || node.category === 'sink') {
          connRow.style.display = 'block';
          const stat = studio.connectorStatuses[node.type] || 'Connected';
          const statVal = document.getElementById('insp-connector-status-val');
          if (statVal) {
            statVal.textContent = stat.toUpperCase();
            statVal.style.color = stat.toLowerCase() === 'connected' ? '#10B981' : '#EF4444';
          }
        } else {
          connRow.style.display = 'none';
        }
      }

      if (terminal) {
        const lines = studio.terminalLines[node.id] || [];
        terminal.textContent = lines.length > 0
          ? lines.join('\n')
          : (isTapped ? 'Wire-tap enabled. Waiting for stream records...' : 'No active wire-tap on this node. Click \'Enable Tap\' to stream live tuples across /comms.');
        terminal.scrollTop = terminal.scrollHeight;
      }
    }

    async function toggleSelectedNodeWireTap() {
      if (!studio.selectedNodeId) return;
      const node = studio.nodes.find(n => n.id === studio.selectedNodeId);
      if (!node) return;

      const willEnable = !node.tapActive;
      node.tapActive = willEnable;

      const endpoint = `/rules/${encodeURIComponent(studio.ruleId)}/tap/${encodeURIComponent(node.id)}/${willEnable ? 'enable' : 'disable'}`;

      // Notify backend via HTTP
      try {
        await apiFetch(endpoint, { method: 'POST' });
      } catch (e) {
        // Fallback or offline
      }

      // Notify backend via WebSocket if connected
      if (studio.commsWs && studio.commsWs.readyState === WebSocket.OPEN) {
        try {
          studio.commsWs.send(JSON.stringify({
            action: willEnable ? 'enable' : 'disable',
            rule: studio.ruleId,
            node: node.id
          }));
        } catch (e) {}
      }

      // Update UI visuals
      const pulseEl = document.getElementById(`tap-indicator-${node.id}`);
      if (pulseEl) pulseEl.style.display = willEnable ? 'inline-flex' : 'none';
      const dot = document.getElementById(`status-dot-${node.id}`);
      if (dot) dot.classList.toggle('streaming', willEnable);

      updateInspectorWireTap(node);
      showToast(`Wire-tap on '${node.id}' ${willEnable ? 'enabled (max 20 msg/s)' : 'disabled'}`, 'success');

      manageStudioSimulator(willEnable);
    }

    function manageStudioSimulator(enable) {
      if (studio.simInterval) {
        clearInterval(studio.simInterval);
        studio.simInterval = null;
      }

      const anyTapped = studio.nodes.some(n => n.tapActive);
      if (!anyTapped) return;

      studio.simInterval = setInterval(() => {
        const activeNodes = studio.nodes.filter(n => n.tapActive);
        if (activeNodes.length === 0) {
          clearInterval(studio.simInterval);
          studio.simInterval = null;
          return;
        }

        activeNodes.forEach(node => {
          let port = 0;
          let sampleData = {};

          if (node.type === 'switch') {
            const temp = Number((68 + Math.random() * 22).toFixed(1));
            const press = Number((90 + Math.random() * 32).toFixed(1));
            port = temp > 75 ? 0 : 1;
            sampleData = {
              device: "Edge-Gateway-04",
              temperature: temp,
              pressure_psi: press,
              routed_port: port,
              ts: Date.now()
            };
          } else if (node.category === 'source') {
            sampleData = {
              device: "Detroit-Press-5",
              plant: "Detroit-Plant",
              oil_temp: Number((55 + Math.random() * 28).toFixed(1)),
              pressure_psi: Number((95 + Math.random() * 30).toFixed(1)),
              valve_open: Math.random() > 0.35,
              ts: Date.now()
            };
          } else if (node.category === 'sink') {
            sampleData = {
              sink: node.id,
              target: node.type,
              status: "DELIVERED",
              payload: { alert: "Threshold exceeded", val: Number((82 + Math.random() * 12).toFixed(1)) },
              ts: Date.now()
            };
          } else {
            sampleData = {
              node: node.id,
              type: node.type,
              processed: true,
              value: Number((10 + Math.random() * 90).toFixed(2)),
              ts: Date.now()
            };
          }

          handleCommsEvent({
            type: 'tuple_sample',
            rule_id: studio.ruleId,
            node_id: node.id,
            port: port,
            data: sampleData
          });
        });
      }, 850);
    }

    function clearTapTerminal() {
      if (!studio.selectedNodeId) return;
      studio.terminalLines[studio.selectedNodeId] = [];
      const terminal = document.getElementById('insp-tap-terminal');
      if (terminal) terminal.textContent = 'Terminal cleared.';
    }

    // ==========================================
    // Fleet Control Plane ("Rekuiper Manager")
    // ==========================================
    const fleetState = {
      devices: [],
      rollouts: [],
      snapshots: [],
      audit: [],
      dlqAlerts: [],
      activeInspectDeviceId: null,
      currentProxyPath: '/rules',
      initialized: false,
      pollInterval: null
    };

    function initFleetIfNeeded() {
      if (!fleetState.initialized) {
        fleetState.initialized = true;
        refreshFleetData(false);
        fleetState.pollInterval = setInterval(() => {
          const fleetView = document.getElementById('view-fleet');
          if (fleetView && fleetView.style.display !== 'none') {
            refreshFleetData(false);
          }
        }, 3000);
      } else {
        refreshFleetData(true);
      }
    }

    async function refreshFleetData(showToasts = false) {
      try {
        const [devRes, rollRes, snapRes, auditRes, dlqRes] = await Promise.all([
          apiFetch('/api/v1/fleet/devices'),
          apiFetch('/api/v1/fleet/rollouts'),
          apiFetch('/api/v1/fleet/snapshots'),
          apiFetch('/api/v1/fleet/audit'),
          apiFetch('/api/v1/fleet/dlq')
        ]);

        if (devRes.ok && Array.isArray(devRes.body)) {
          fleetState.devices = devRes.body;
        }
        if (rollRes.ok && Array.isArray(rollRes.body)) {
          fleetState.rollouts = rollRes.body;
        }
        if (snapRes.ok && Array.isArray(snapRes.body)) {
          fleetState.snapshots = snapRes.body;
        }
        if (auditRes.ok && Array.isArray(auditRes.body)) {
          fleetState.audit = auditRes.body;
        }
        if (dlqRes.ok && Array.isArray(dlqRes.body)) {
          fleetState.dlqAlerts = dlqRes.body;
        }

        renderFleetKpis();
        renderFleetPipelineVisual();
        renderFleetRollouts();
        renderFleetDevices();
        renderFleetDlq();
        renderFleetAuditLog();
        populateFilterDropdowns();
        populateSnapshotSelect();

        if (showToasts) {
          showToast(`Fleet telemetry updated (${fleetState.devices.length} devices)`, 'success');
        }
      } catch (err) {
        console.error('Failed to refresh fleet data:', err);
      }
    }

    function renderFleetKpis() {
      const totalDevs = fleetState.devices.length;
      const onlineDevs = fleetState.devices.filter(d => (d.status || '').toLowerCase() === 'online').length;
      const totalRollouts = fleetState.rollouts.length;
      const canaryRollouts = fleetState.rollouts.filter(r => r.status === 'canary_evaluating' || r.current_stage === 'canary').length;
      const totalSnaps = fleetState.snapshots.length;
      
      let totalDlq = 0;
      let totalRollbacks = 0;
      fleetState.devices.forEach(d => {
        totalDlq += (d.dlq_count || 0);
        if (d.last_rollback_reason) totalRollbacks++;
      });
      fleetState.dlqAlerts.forEach(a => {
        if (a.dlq_count) totalDlq += a.dlq_count;
        if (a.rollback_reason) totalRollbacks++;
      });

      document.getElementById('fleet-kpi-total').textContent = totalDevs;
      document.getElementById('fleet-kpi-online-badge').textContent = `${onlineDevs} Online`;
      document.getElementById('fleet-kpi-online-sub').textContent = `${onlineDevs} connected Yamux agents`;

      document.getElementById('fleet-kpi-rollouts').textContent = totalRollouts;
      document.getElementById('fleet-kpi-canary-sub').textContent = `${canaryRollouts} Canary evaluating`;

      document.getElementById('fleet-kpi-snapshots').textContent = totalSnaps;

      const dlqEl = document.getElementById('fleet-kpi-dlq');
      const dlqBadge = document.getElementById('fleet-kpi-dlq-badge');
      dlqEl.textContent = totalDlq;
      if (totalDlq > 0 || totalRollbacks > 0) {
        dlqBadge.className = 'badge badge-rose';
        dlqBadge.textContent = `${totalRollbacks} Rollbacks / Alerts`;
      } else {
        dlqBadge.className = 'badge badge-slate';
        dlqBadge.textContent = 'Clean';
      }
      document.getElementById('fleet-kpi-rollback-sub').textContent = `${totalRollbacks} watchdog rollbacks`;
    }

    function renderFleetPipelineVisual() {
      const stages = ['dev', 'staging', 'canary', 'prod'];
      const activeRollout = fleetState.rollouts.find(r => r.status === 'in_progress' || r.status === 'canary_evaluating') || fleetState.rollouts[0];

      stages.forEach(s => {
        const node = document.getElementById(`pipe-node-${s}`);
        if (!node) return;
        node.className = 'pipeline-node';
        node.style.borderColor = '';
        node.style.background = '';
        node.style.color = '';
      });

      if (!activeRollout) return;

      const currentStage = activeRollout.current_stage ? activeRollout.current_stage.toLowerCase() : 'dev';
      const isFailed = activeRollout.status === 'rolled_back' || activeRollout.status === 'failed';

      let stageIdx = 0;
      if (currentStage === 'dev') stageIdx = 0;
      else if (currentStage === 'staging') stageIdx = 1;
      else if (currentStage === 'canary') stageIdx = 2;
      else if (currentStage === 'production' || currentStage === 'prod') stageIdx = 3;

      for (let i = 0; i <= stageIdx; i++) {
        const node = document.getElementById(`pipe-node-${stages[i]}`);
        if (!node) continue;
        if (i === stageIdx) {
          if (isFailed) {
            node.className = 'pipeline-node failed';
          } else {
            node.className = 'pipeline-node active';
          }
        } else {
          node.className = 'pipeline-node success';
        }
      }
    }

    function renderFleetRollouts() {
      const tbody = document.getElementById('fleet-rollouts-tbody');
      if (!tbody) return;

      if (!fleetState.rollouts || fleetState.rollouts.length === 0) {
        tbody.innerHTML = `<tr><td colspan="8" style="text-align: center; color: var(--text-muted); padding: 24px;">No rollouts recorded. Click "+ New Rollout" to launch a staged Canary rollout.</td></tr>`;
        return;
      }

      tbody.innerHTML = fleetState.rollouts.map(r => {
        let statusBadge = '';
        if (r.status === 'canary_evaluating') {
          statusBadge = '<span class="badge badge-amber"><span class="badge-dot"></span>Canary Evaluating</span>';
        } else if (r.status === 'in_progress') {
          statusBadge = '<span class="badge badge-indigo"><span class="badge-dot"></span>In Progress</span>';
        } else if (r.status === 'promoted') {
          statusBadge = '<span class="badge badge-emerald"><span class="badge-dot"></span>Promoted 100%</span>';
        } else if (r.status === 'rolled_back') {
          statusBadge = '<span class="badge badge-rose"><span class="badge-dot"></span>Rolled Back (Halted)</span>';
        } else {
          statusBadge = `<span class="badge badge-slate">${escapeHtml(r.status)}</span>`;
        }

        const canPromote = (r.status === 'canary_evaluating' || r.status === 'in_progress') && (r.current_stage !== 'production');
        const canRollback = (r.status === 'canary_evaluating' || r.status === 'in_progress');

        return `

          <tr>

            <td><strong>${escapeHtml(r.rollout_id)}</strong></td>

            <td><code>${escapeHtml((r.snapshot_id || '').substring(0, 10))}...</code></td>

            <td><span class="badge badge-slate">${escapeHtml(r.target_group || 'all')}</span></td>

            <td><strong style="text-transform: capitalize;">${escapeHtml(r.current_stage)}</strong></td>

            <td>${statusBadge}</td>

            <td class="tabular">${r.successful_devices || 0} / ${r.target_device_count || 0}</td>

            <td style="color: ${r.last_error ? 'var(--rose-text)' : 'var(--text-muted)'}; font-size: 12px;">

              ${r.last_error ? escapeHtml(r.last_error) : 'Healthy &mdash; Watchdog clear'}

            </td>

            <td style="text-align: right; white-space: nowrap;">

              ${canPromote ? `<button class="btn btn-sm btn-primary" onclick="promoteRollout('${escapeHtml(r.rollout_id)}')" title="Promote to next stage or 100% Production">Promote &rarr;</button>` : ''}

              ${canRollback ? `<button class="btn btn-sm btn-danger" onclick="rollbackRollout('${escapeHtml(r.rollout_id)}')" title="Halt rollout immediately">Halt / Rollback</button>` : ''}

              ${!canPromote && !canRollback ? `<span style="font-size: 11px; color: var(--text-faint);">Complete</span>` : ''}

            </td>

          </tr>

        `;
      }).join('');
    }

    function renderFleetDevices() {
      const tbody = document.getElementById('fleet-devices-tbody');
      if (!tbody) return;

      const searchTerm = (document.getElementById('fleet-filter-search')?.value || '').toLowerCase();
      const plantFilter = document.getElementById('fleet-filter-plant')?.value || 'all';
      const regionFilter = document.getElementById('fleet-filter-region')?.value || 'all';
      const statusFilter = document.getElementById('fleet-filter-status')?.value || 'all';

      const filtered = fleetState.devices.filter(d => {
        if (searchTerm) {
          const matchId = (d.device_id || '').toLowerCase().includes(searchTerm);
          const matchName = (d.name || '').toLowerCase().includes(searchTerm);
          const matchVer = (d.version || '').toLowerCase().includes(searchTerm);
          if (!matchId && !matchName && !matchVer) return false;
        }
        const plant = d.plant || d.group?.plant || '';
        const region = d.region || d.group?.region || '';
        if (plantFilter !== 'all' && plant !== plantFilter) return false;
        if (regionFilter !== 'all' && region !== regionFilter) return false;
        if (statusFilter !== 'all' && (d.status || '').toLowerCase() !== statusFilter.toLowerCase()) return false;
        return true;
      });

      document.getElementById('fleet-catalog-count-badge').textContent = `${filtered.length} of ${fleetState.devices.length} devices`;

      if (filtered.length === 0) {
        tbody.innerHTML = `<tr><td colspan="9" style="text-align: center; color: var(--text-muted); padding: 24px;">No devices matched the selected filter criteria.</td></tr>`;
        return;
      }

      tbody.innerHTML = filtered.map(d => {
        const isOnline = (d.status || '').toLowerCase() === 'online';
        const isDegraded = (d.status || '').toLowerCase() === 'degraded';
        const statusBadge = isOnline
          ? '<span class="badge badge-emerald"><span class="badge-dot"></span>Online</span>'
          : isDegraded
            ? '<span class="badge badge-amber"><span class="badge-dot"></span>Degraded</span>'
            : '<span class="badge badge-slate"><span class="badge-dot"></span>Offline</span>';

        const cpuVal = (d.cpu_usage ?? d.cpu_percent ?? 0).toFixed(1);
        const memVal = d.memory_bytes ? (d.memory_bytes / 1024 / 1024).toFixed(0) : 0;
        const cpuMem = `${cpuVal}% / ${memVal} MB`;
        const activeSnap = d.active_snapshot_id
          ? `<span title="${escapeHtml(d.active_snapshot_hash || '')}"><code>${escapeHtml(d.active_snapshot_id.substring(0, 10))}</code></span>`
          : '<span style="color: var(--text-faint);">-</span>';

        const dlqText = (d.dlq_count > 0)
          ? `<strong style="color: var(--rose-text);">${d.dlq_count}</strong>`
          : '0';

        const heartbeatTime = d.last_heartbeat ? new Date(d.last_heartbeat * 1000).toLocaleTimeString() : 'Never';
        const plant = d.plant || d.group?.plant || 'N/A';
        const region = d.region || d.group?.region || 'N/A';
        const devType = d.device_type || d.group?.device_type || 'edge-gateway';
        const rulesTotal = d.rules_count ?? d.rule_count ?? 0;
        const rulesRunning = d.running_rules ?? rulesTotal;

        return `

          <tr>

            <td>${statusBadge}</td>

            <td>

              <strong>${escapeHtml(d.name || d.device_id)}</strong>

              <div style="font-size: 11px; color: var(--text-muted); font-family: var(--font-mono);">${escapeHtml(d.device_id)}</div>

            </td>

            <td>

              <div>${escapeHtml(plant)}</div>

              <div style="font-size: 11px; color: var(--text-muted);">${escapeHtml(region)}</div>

            </td>

            <td>

              <div>${escapeHtml(devType)}</div>

              <div style="font-size: 11px; color: var(--text-muted);">v${escapeHtml(d.version || '0.1.0')}</div>

            </td>

            <td class="tabular">${cpuMem}</td>

            <td>${activeSnap}</td>

            <td class="tabular">${rulesRunning} / ${rulesTotal} rules (${dlqText} DLQ)</td>

            <td class="tabular" style="font-size: 12px; color: var(--text-muted);">${heartbeatTime}</td>

            <td style="text-align: right;">

              <button class="btn btn-sm btn-primary" onclick="openRemoteInspectModal('${escapeHtml(d.device_id)}')">

                <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path><circle cx="12" cy="12" r="3"></circle></svg>

                Remote Inspect

              </button>

            </td>

          </tr>

        `;
      }).join('');
    }

    function renderFleetDlq() {
      const tbody = document.getElementById('fleet-dlq-tbody');
      if (!tbody) return;

      const alerts = [];
      fleetState.devices.forEach(d => {
        if (d.dlq_count > 0 || d.last_rollback_reason) {
          alerts.push({
            device_id: d.device_id,
            dlq_count: d.dlq_count || 0,
            reason: d.last_rollback_reason || 'DLQ messages accumulated',
            time: d.last_heartbeat ? new Date(d.last_heartbeat * 1000).toLocaleTimeString() : 'Recent'
          });
        }
      });
      fleetState.dlqAlerts.forEach(a => {
        alerts.push({
          device_id: a.device_id,
          dlq_count: a.dlq_count || 0,
          reason: a.rollback_reason || a.error || 'Alert trigger',
          time: a.timestamp ? new Date(a.timestamp * 1000).toLocaleTimeString() : 'Recent'
        });
      });

      document.getElementById('fleet-dlq-count-badge').textContent = `${alerts.length} Alerts`;

      if (alerts.length === 0) {
        tbody.innerHTML = `<tr><td colspan="4" style="text-align: center; color: var(--text-muted); padding: 18px;">No edge anomalies or DLQ overflows reported.</td></tr>`;
        return;
      }

      tbody.innerHTML = alerts.map(a => `

        <tr>

          <td><code>${escapeHtml(a.device_id)}</code></td>

          <td class="tabular"><strong style="color: var(--rose-text);">${a.dlq_count}</strong></td>

          <td style="font-size: 12px; color: var(--rose-text);">${escapeHtml(a.reason)}</td>

          <td class="tabular" style="font-size: 12px; color: var(--text-muted);">${escapeHtml(a.time)}</td>

        </tr>

      `).join('');
    }

    function renderFleetAuditLog() {
      const tbody = document.getElementById('fleet-audit-tbody');
      if (!tbody) return;

      if (!fleetState.audit || fleetState.audit.length === 0) {
        tbody.innerHTML = `<tr><td colspan="5" style="text-align: center; color: var(--text-muted); padding: 18px;">Audit log is currently empty.</td></tr>`;
        return;
      }

      tbody.innerHTML = fleetState.audit.map(entry => {
        const timeStr = entry.timestamp ? new Date(entry.timestamp * 1000).toLocaleTimeString() : '';
        const isFailed = entry.status === 'failed' || (entry.details && typeof entry.details === 'object' && (entry.details.error || entry.details.status === 'error'));
        const statusBadge = isFailed
          ? '<span class="badge badge-rose" style="padding: 1px 6px; font-size: 11px;">Failed</span>'
          : '<span class="badge badge-emerald" style="padding: 1px 6px; font-size: 11px;">Success</span>';

        const target = entry.target_id || entry.target || '-';
        let detailsStr = '-';
        if (entry.details !== undefined && entry.details !== null) {
          if (typeof entry.details === 'object') {
            if (entry.action === 'proxy_request' && entry.details.method && entry.details.path) {
              detailsStr = `${entry.details.method} ${entry.details.path}`;
            } else if (Object.keys(entry.details).length === 0) {
              detailsStr = '-';
            } else {
              try {
                detailsStr = JSON.stringify(entry.details);
              } catch (e) {
                detailsStr = String(entry.details);
              }
            }
          } else {
            detailsStr = String(entry.details);
          }
        }

        return `

          <tr>

            <td class="tabular" style="font-size: 11.5px; color: var(--text-muted);">${timeStr}</td>

            <td><strong>${escapeHtml(entry.action)}</strong></td>

            <td><code>${escapeHtml(target)}</code></td>

            <td>${statusBadge}</td>

            <td style="font-size: 12px; max-width: 280px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;" title="${escapeHtml(detailsStr)}">

              ${escapeHtml(detailsStr)}

            </td>

          </tr>

        `;
      }).join('');
    }

    function populateFilterDropdowns() {
      const plantSelect = document.getElementById('fleet-filter-plant');
      const regionSelect = document.getElementById('fleet-filter-region');
      if (!plantSelect || !regionSelect) return;

      const currentPlant = plantSelect.value;
      const currentRegion = regionSelect.value;

      const plants = new Set();
      const regions = new Set();
      fleetState.devices.forEach(d => {
        const plant = d.plant || d.group?.plant;
        const region = d.region || d.group?.region;
        if (plant) plants.add(plant);
        if (region) regions.add(region);
      });

      plantSelect.innerHTML = '<option value="all">All Plants</option>' +
        Array.from(plants).sort().map(p => `<option value="${escapeHtml(p)}" ${p === currentPlant ? 'selected' : ''}>${escapeHtml(p)}</option>`).join('');

      regionSelect.innerHTML = '<option value="all">All Regions</option>' +
        Array.from(regions).sort().map(r => `<option value="${escapeHtml(r)}" ${r === currentRegion ? 'selected' : ''}>${escapeHtml(r)}</option>`).join('');
    }

    function populateSnapshotSelect() {
      const select = document.getElementById('new-rollout-snapshot-id');
      if (!select) return;

      const current = select.value;
      if (!fleetState.snapshots || fleetState.snapshots.length === 0) {
        select.innerHTML = '<option value="">No snapshots found (create one via /api/v1/fleet/snapshots)</option>';
        return;
      }

      select.innerHTML = '<option value="">Select an immutable snapshot...</option>' +
        fleetState.snapshots.map(s => `

          <option value="${escapeHtml(s.snapshot_id)}" ${s.snapshot_id === current ? 'selected' : ''}>

            ${escapeHtml(s.snapshot_id)} (${escapeHtml((s.sha256_hash || '').substring(0, 8))}...)

          </option>

        `).join('');
    }

    // Remote Yamux Proxy Inspection
    function openRemoteInspectModal(deviceId) {
      const device = fleetState.devices.find(d => d.device_id === deviceId);
      fleetState.activeInspectDeviceId = deviceId;
      fleetState.currentProxyPath = '/rules';

      document.getElementById('inspect-modal-device-id').textContent = `[${deviceId}]`;
      document.getElementById('inspect-device-plant').textContent = device?.plant || device?.group?.plant || '-';
      document.getElementById('inspect-device-region').textContent = device?.region || device?.group?.region || '-';
      document.getElementById('inspect-device-type').textContent = device?.device_type || device?.group?.device_type || '-';

      const isOnline = (device?.status || '').toLowerCase() === 'online';
      const badge = document.getElementById('inspect-device-status-badge');
      badge.className = isOnline ? 'badge badge-emerald' : 'badge badge-rose';
      badge.textContent = isOnline ? 'Online (Yamux Stream 1..N Active)' : 'Offline';

      document.getElementById('fleet-inspect-modal').style.display = 'flex';
      fetchProxyEndpoint('/rules');
    }

    function closeRemoteInspectModal() {
      document.getElementById('fleet-inspect-modal').style.display = 'none';
      fleetState.activeInspectDeviceId = null;
    }

    async function fetchProxyEndpoint(subpath) {
      if (!fleetState.activeInspectDeviceId) return;
      fleetState.currentProxyPath = subpath;

      const devId = fleetState.activeInspectDeviceId;
      const displayPath = (!subpath || subpath === '/') ? '/' : (subpath.startsWith('/') ? subpath : '/' + subpath);
      document.getElementById('inspect-target-url-label').textContent = `Tunneled: GET /api/v1/fleet/devices/${devId}/proxy${displayPath}`;
      const box = document.getElementById('inspect-response-box');
      box.textContent = `Tunneling GET ${displayPath} to edge gateway '${devId}' over Yamux stream...`;

      try {
        const queryPath = (!subpath || subpath === '/') ? '' : (subpath.startsWith('/') ? subpath : '/' + subpath);
        const res = await apiFetch(`/api/v1/fleet/devices/${encodeURIComponent(devId)}/proxy${queryPath}`);
        if (res.ok) {
          box.textContent = (typeof res.body === 'object') ? JSON.stringify(res.body, null, 2) : res.body;
        } else {
          box.textContent = `Proxy tunnel error (HTTP ${res.status}):\n${typeof res.body === 'object' ? JSON.stringify(res.body, null, 2) : res.body}`;
        }
      } catch (e) {
        box.textContent = `Proxy connection failed: ${e.message}`;
      }
    }

    function refreshCurrentProxyInspection() {
      fetchProxyEndpoint(fleetState.currentProxyPath);
    }

    // Rollout Modals & Actions
    function openNewRolloutModal() {
      document.getElementById('new-rollout-id').value = `rollout-${Date.now().toString().slice(-6)}`;
      populateSnapshotSelect();
      document.getElementById('fleet-rollout-modal').style.display = 'flex';
    }

    function closeNewRolloutModal() {
      document.getElementById('fleet-rollout-modal').style.display = 'none';
    }

    async function submitCreateRollout() {
      const rolloutId = document.getElementById('new-rollout-id').value.trim();
      const snapshotId = document.getElementById('new-rollout-snapshot-id').value.trim();
      const targetGroup = document.getElementById('new-rollout-group').value.trim() || 'all';
      const stage = document.getElementById('new-rollout-stage').value;

      if (!rolloutId || !snapshotId) {
        showToast('Please provide both Rollout ID and Snapshot ID', 'error');
        return;
      }

      try {
        const payload = {
          rollout_id: rolloutId,
          snapshot_id: snapshotId,
          target_group: targetGroup,
          current_stage: stage,
          status: (stage === 'canary') ? 'canary_evaluating' : 'in_progress',
          canary_percentage: 5,
          promoted_at: null,
          created_at: Math.floor(Date.now() / 1000)
        };

        const res = await apiFetch('/api/v1/fleet/rollouts', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify(payload)
        });

        if (res.ok) {
          showToast(`Staged rollout '${rolloutId}' launched!`, 'success');
          closeNewRolloutModal();
          refreshFleetData(false);
        } else {
          showToast(`Failed to create rollout: ${res.status}`, 'error');
        }
      } catch (err) {
        showToast(`Error: ${err.message}`, 'error');
      }
    }

    async function promoteRollout(rolloutId) {
      try {
        const res = await apiFetch(`/api/v1/fleet/rollouts/${encodeURIComponent(rolloutId)}/promote`, {
          method: 'POST'
        });
        if (res.ok) {
          showToast(`Rollout '${rolloutId}' promoted successfully!`, 'success');
          refreshFleetData(false);
        } else {
          showToast(`Promotion failed (HTTP ${res.status})`, 'error');
        }
      } catch (e) {
        showToast(`Promotion error: ${e.message}`, 'error');
      }
    }

    async function rollbackRollout(rolloutId) {
      try {
        const res = await apiFetch(`/api/v1/fleet/rollouts/${encodeURIComponent(rolloutId)}/rollback`, {
          method: 'POST'
        });
        if (res.ok) {
          showToast(`Rollout '${rolloutId}' halted and marked rolled_back`, 'info');
          refreshFleetData(false);
        } else {
          showToast(`Rollback failed (HTTP ${res.status})`, 'error');
        }
      } catch (e) {
        showToast(`Rollback error: ${e.message}`, 'error');
      }
    }

    /* ==========================================================================
       PHASE 1: GUIDED 3-STEP RULE DESIGNER & VISUAL SCHEMA BUILDER CONTROLLERS
       ========================================================================== */

    // --------------------------------------------------------------------------
    // 1. GUIDED 3-STEP RULE DESIGNER CONTROLLER
    // --------------------------------------------------------------------------
    const ruleDesignerState = {
      isEditing: false,
      currentStep: 1,
      queryMode: 'form', // 'form' | 'raw'
      ruleId: '',
      source: '',
      selectFields: '*',
      where: '',
      windowType: 'none',
      windowVal: 10,
      windowUnit: 'ss',
      groupby: '',
      having: '',
      orderby: '',
      limit: '',
      rawSql: '',
      sinks: [],
      options: {
        qos: 0,
        checkpointInterval: 300000,
        concurrency: 1,
        bufferLength: 1024,
        isEventTime: false,
        timestampField: 'ts',
        lateTolerance: 1000,
        sendMetaToSink: false,
        sendError: false,
        triggered: false
      }
    };

    function resetRuleDesignerState() {
      ruleDesignerState.isEditing = false;
      ruleDesignerState.currentStep = 1;
      ruleDesignerState.queryMode = 'form';
      ruleDesignerState.ruleId = '';
      ruleDesignerState.source = state.streams.length > 0 ? (state.streams[0].name || state.streams[0]) : '';
      ruleDesignerState.selectFields = '*';
      ruleDesignerState.where = '';
      ruleDesignerState.windowType = 'none';
      ruleDesignerState.windowVal = 10;
      ruleDesignerState.windowUnit = 'ss';
      ruleDesignerState.groupby = '';
      ruleDesignerState.having = '';
      ruleDesignerState.orderby = '';
      ruleDesignerState.limit = '';
      ruleDesignerState.rawSql = '';
      ruleDesignerState.sinks = [
        {
          type: 'mqtt',
          server: 'tcp://127.0.0.1:1883',
          topic: 'rekuiper/alerts',
          qos: 0,
          clientId: '',
          confKey: '',
          sendSingle: true,
          dataTemplate: '',
          omitIfEmpty: false,
          runAsync: false
        }
      ];
      ruleDesignerState.options = {
        qos: 0,
        checkpointInterval: 300000,
        concurrency: 1,
        bufferLength: 1024,
        isEventTime: false,
        timestampField: 'ts',
        lateTolerance: 1000,
        sendMetaToSink: false,
        sendError: false,
        triggered: false
      };
    }

    function openNewRuleDesigner() {
      resetRuleDesignerState();
      document.getElementById('rule-designer-modal-title').textContent = 'Guided Rule Pipeline Designer';
      document.getElementById('rd-rule-id').readOnly = false;
      populateRuleDesignerSources();
      syncStateToRuleDesignerUI();
      updateWindowExplanation();
      updateStreamFieldPills();
      goToRuleDesignerStep(1);
      document.getElementById('rule-designer-modal').style.display = 'flex';
      updateRuleDesignerPreview();
    }

    async function openExistingRuleDesigner(ruleId) {
      resetRuleDesignerState();
      ruleDesignerState.isEditing = true;
      ruleDesignerState.ruleId = ruleId;
      document.getElementById('rule-designer-modal-title').textContent = `Edit Pipeline: ${ruleId}`;
      document.getElementById('rd-rule-id').readOnly = true;
      populateRuleDesignerSources();

      try {
        const res = await apiFetch(`/rules/${encodeURIComponent(ruleId)}`);
        if (res.ok && res.body) {
          const rule = res.body;
          ruleDesignerState.rawSql = rule.sql || '';
          ruleDesignerState.ruleId = rule.id || ruleId;

          // Parse sinks / actions
          if (Array.isArray(rule.actions) && rule.actions.length > 0) {
            ruleDesignerState.sinks = rule.actions.map(act => {
              const type = Object.keys(act)[0] || 'mqtt';
              const props = act[type] || {};
              return {
                type,
                server: props.server || 'tcp://127.0.0.1:1883',
                topic: props.topic || '',
                url: props.url || '',
                method: props.method || 'POST',
                headers: props.headers ? JSON.stringify(props.headers) : '',
                brokers: props.brokers || '',
                path: props.path || '',
                qos: props.qos || 0,
                clientId: props.clientId || '',
                confKey: props.confKey || '',
                sendSingle: Boolean(props.sendSingle),
                dataTemplate: props.dataTemplate || '',
                omitIfEmpty: Boolean(props.omitIfEmpty),
                runAsync: Boolean(props.runAsync)
              };
            });
          }

          // Options
          if (rule.options) {
            const o = rule.options;
            ruleDesignerState.options.qos = o.qos ?? 0;
            ruleDesignerState.options.checkpointInterval = o.checkpointInterval ?? 300000;
            ruleDesignerState.options.concurrency = o.concurrency ?? 1;
            ruleDesignerState.options.bufferLength = o.bufferLength ?? 1024;
            ruleDesignerState.options.isEventTime = Boolean(o.isEventTime);
            ruleDesignerState.options.timestampField = o.timestampFormat || o.timestampField || 'ts';
            ruleDesignerState.options.lateTolerance = o.lateTolerance ?? 1000;
            ruleDesignerState.options.sendMetaToSink = Boolean(o.sendMetaToSink);
            ruleDesignerState.options.sendError = Boolean(o.sendError);
            ruleDesignerState.options.triggered = Boolean(o.triggered);
          }

          // Switch to raw query mode since existing rule may have complex SQL
          ruleDesignerState.queryMode = 'raw';
        }
      } catch (err) {
        console.error('Failed to load rule for designer:', err);
      }

      syncStateToRuleDesignerUI();
      goToRuleDesignerStep(1);
      document.getElementById('rule-designer-modal').style.display = 'flex';
      updateRuleDesignerPreview();
    }

    function closeRuleDesignerModal() {
      document.getElementById('rule-designer-modal').style.display = 'none';
    }

    function populateRuleDesignerSources() {
      const select = document.getElementById('rd-source-select');
      select.innerHTML = '<option value="">Select source stream/table...</option>';
      state.streams.forEach(s => {
        const name = typeof s === 'string' ? s : (s.name || s.id);
        const opt = document.createElement('option');
        opt.value = name;
        opt.textContent = `Stream: ${name}`;
        select.appendChild(opt);
      });
      state.tables.forEach(t => {
        const name = typeof t === 'string' ? t : (t.name || t.id);
        const opt = document.createElement('option');
        opt.value = name;
        opt.textContent = `Table: ${name}`;
        select.appendChild(opt);
      });
    }

    function syncStateToRuleDesignerUI() {
      document.getElementById('rd-rule-id').value = ruleDesignerState.ruleId;
      document.getElementById('rd-source-select').value = ruleDesignerState.source;
      document.getElementById('rd-select-fields').value = ruleDesignerState.selectFields;
      document.getElementById('rd-where-clause').value = ruleDesignerState.where;
      document.getElementById('rd-window-type').value = ruleDesignerState.windowType;
      document.getElementById('rd-window-val').value = ruleDesignerState.windowVal;
      document.getElementById('rd-window-unit').value = ruleDesignerState.windowUnit;
      document.getElementById('rd-groupby-clause').value = ruleDesignerState.groupby;
      document.getElementById('rd-having-clause').value = ruleDesignerState.having;
      document.getElementById('rd-orderby-clause').value = ruleDesignerState.orderby;
      document.getElementById('rd-limit-clause').value = ruleDesignerState.limit;
      document.getElementById('rd-raw-sql').value = ruleDesignerState.rawSql;

      setRuleQueryMode(ruleDesignerState.queryMode);
      renderDesignerSinks();

      // Step 3 options
      document.getElementById('rd-opt-qos').value = String(ruleDesignerState.options.qos);
      document.getElementById('rd-opt-checkpoint').value = ruleDesignerState.options.checkpointInterval;
      document.getElementById('rd-opt-concurrency').value = ruleDesignerState.options.concurrency;
      document.getElementById('rd-opt-buffer').value = ruleDesignerState.options.bufferLength;
      document.getElementById('rd-opt-is-event-time').checked = ruleDesignerState.options.isEventTime;
      document.getElementById('rd-opt-ts-field').value = ruleDesignerState.options.timestampField;
      document.getElementById('rd-opt-late-tolerance').value = ruleDesignerState.options.lateTolerance;
      document.getElementById('rd-opt-send-meta').checked = ruleDesignerState.options.sendMetaToSink;
      document.getElementById('rd-opt-send-error').checked = ruleDesignerState.options.sendError;
      document.getElementById('rd-opt-triggered').checked = ruleDesignerState.options.triggered;

      toggleEventTimeFields();
    }

    function goToRuleDesignerStep(step) {
      ruleDesignerState.currentStep = step;
      [1, 2, 3].forEach(s => {
        const tab = document.getElementById(`rule-step-tab-${s}`);
        const view = document.getElementById(`rule-step-view-${s}`);
        if (tab) {
          tab.classList.toggle('active', s === step);
          tab.classList.toggle('completed', s < step);
        }
        if (view) {
          view.style.display = (s === step) ? 'flex' : 'none';
        }
      });

      const prevBtn = document.getElementById('rd-prev-btn');
      const nextBtn = document.getElementById('rd-next-btn');
      const deployBtn = document.getElementById('rd-deploy-btn');

      prevBtn.style.display = step > 1 ? 'inline-block' : 'none';
      if (step === 3) {
        nextBtn.style.display = 'none';
        deployBtn.style.display = 'inline-block';
      } else {
        nextBtn.style.display = 'inline-block';
        deployBtn.style.display = 'none';
      }

      updateRuleDesignerPreview();
    }

    function stepRuleDesigner(delta) {
      const next = ruleDesignerState.currentStep + delta;
      if (next >= 1 && next <= 3) {
        goToRuleDesignerStep(next);
      }
    }

    function setRuleQueryMode(mode) {
      ruleDesignerState.queryMode = mode;
      const btnForm = document.getElementById('rd-mode-btn-form');
      const btnRaw = document.getElementById('rd-mode-btn-raw');
      const panelForm = document.getElementById('rd-visual-panel');
      const panelRaw = document.getElementById('rd-raw-panel');

      if (mode === 'form') {
        btnForm.style.background = 'var(--accent)';
        btnForm.style.color = '#fff';
        btnRaw.style.background = 'var(--bg-surface)';
        btnRaw.style.color = 'var(--text-secondary)';
        panelForm.style.display = 'flex';
        panelRaw.style.display = 'none';
        generateRuleSqlFromVisualForm();
      } else {
        btnRaw.style.background = 'var(--accent)';
        btnRaw.style.color = '#fff';
        btnForm.style.background = 'var(--bg-surface)';
        btnForm.style.color = 'var(--text-secondary)';
        panelForm.style.display = 'none';
        panelRaw.style.display = 'flex';
        if (!ruleDesignerState.rawSql.trim()) {
          generateRuleSqlFromVisualForm();
          document.getElementById('rd-raw-sql').value = ruleDesignerState.rawSql;
        }
      }
      updateRuleDesignerPreview();
    }

    // --- Zero-Knowledge Rule Designer Recipes & Guidance ---
    function loadRuleRecipe(recipeType) {
      const recipes = {
        overheat: {
          id: 'rule_motor_overheat',
          source: 'demo',
          select: 'device_id, temperature, humidity',
          where: 'temperature > 80.0',
          windowType: 'none',
          sinks: [{
            type: 'mqtt',
            server: 'tcp://127.0.0.1:1883',
            topic: 'rekuiper/alerts/overheat',
            qos: 1,
            sendSingle: true
          }]
        },
        moving_avg: {
          id: 'rule_10s_avg_temperature',
          source: 'demo',
          select: 'device_id, avg(temperature) as avg_temp, max(temperature) as max_temp, count(*) as samples',
          where: '',
          windowType: 'tumbling_time',
          windowVal: 10,
          windowUnit: 'ss',
          groupby: 'device_id',
          sinks: [{
            type: 'rest',
            url: 'https://httpbin.org/post',
            method: 'POST',
            sendSingle: false
          }]
        },
        vibration: {
          id: 'rule_vibration_spike',
          source: 'demo',
          select: 'device_id, vibration, lag(vibration) OVER (PARTITION BY device_id) as prev_vibration',
          where: 'vibration > 15.0',
          windowType: 'none',
          sinks: [{
            type: 'mqtt',
            server: 'tcp://127.0.0.1:1883',
            topic: 'rekuiper/alerts/vibration',
            qos: 0,
            sendSingle: true
          }]
        },
        dedup: {
          id: 'rule_dedup_status',
          source: 'demo',
          select: 'device_id, status',
          where: 'had_changed(status)',
          windowType: 'none',
          sinks: [{
            type: 'rest',
            url: 'https://httpbin.org/post',
            method: 'POST',
            sendSingle: true
          }]
        }
      };

      const recipe = recipes[recipeType];
      if (!recipe) return;

      document.getElementById('rd-rule-id').value = recipe.id;
      ruleDesignerState.ruleId = recipe.id;
      
      const sourceSelect = document.getElementById('rd-source-select');
      if (sourceSelect) {
        let hasSource = Array.from(sourceSelect.options).some(o => o.value === recipe.source);
        if (!hasSource) {
          const opt = document.createElement('option');
          opt.value = recipe.source;
          opt.textContent = `Stream: ${recipe.source}`;
          sourceSelect.appendChild(opt);
        }
        sourceSelect.value = recipe.source;
        ruleDesignerState.source = recipe.source;
      }

      document.getElementById('rd-select-fields').value = recipe.select;
      ruleDesignerState.selectFields = recipe.select;

      document.getElementById('rd-where-clause').value = recipe.where || '';
      ruleDesignerState.where = recipe.where || '';

      document.getElementById('rd-window-type').value = recipe.windowType;
      ruleDesignerState.windowType = recipe.windowType;
      if (recipe.windowVal) {
        document.getElementById('rd-window-val').value = recipe.windowVal;
        ruleDesignerState.windowVal = recipe.windowVal;
      }
      if (recipe.windowUnit) {
        document.getElementById('rd-window-unit').value = recipe.windowUnit;
        ruleDesignerState.windowUnit = recipe.windowUnit;
      }

      document.getElementById('rd-groupby-clause').value = recipe.groupby || '';
      ruleDesignerState.groupby = recipe.groupby || '';

      if (recipe.sinks) {
        ruleDesignerState.sinks = recipe.sinks;
        renderDesignerSinks();
      }

      updateWindowExplanation();
      updateStreamFieldPills();
      generateRuleSqlFromVisualForm();
      updateRuleDesignerPreview();
      showToast(`Loaded recipe: ${recipe.id} ⚡`, 'success');
    }

    function updateWindowExplanation() {
      const type = document.getElementById('rd-window-type')?.value || 'none';
      const helpBox = document.getElementById('rd-window-help-text');
      const valGroup = document.getElementById('rd-window-val-group');
      if (!helpBox) return;

      if (valGroup) {
        valGroup.style.display = (type === 'none') ? 'none' : 'grid';
      }

      const explanations = {
        none: 'Real-time (No Window): Events are evaluated individually as soon as they arrive with sub-millisecond latency.',
        tumbling_time: 'Tumbling Time Window: Non-overlapping fixed time buckets (e.g. every 10 seconds). Computes aggregation once bucket closes.',
        tumbling_count: 'Tumbling Count Window: Non-overlapping event count buckets (e.g. every 100 messages) regardless of clock time.',
        hopping_time: 'Hopping Window: Overlapping sliding time window. Evaluates rolling calculations with defined hop step.',
        session_time: 'Session Window: Dynamically closes after an inactivity gap. Ideal for bursts and intermittent edge communication.'
      };

      helpBox.textContent = explanations[type] || 'Select a windowing strategy to aggregate events over time or counts.';
    }

    function updateStreamFieldPills() {
      const container = document.getElementById('rd-stream-field-pills');
      if (!container) return;

      const sourceName = document.getElementById('rd-source-select')?.value || '';
      let fields = ['temperature', 'humidity', 'device_id', 'status', 'pressure', 'rpm', 'voltage'];

      const streamObj = state.streams.find(s => (s.name || s.id || s) === sourceName);
      if (streamObj && Array.isArray(streamObj.fields) && streamObj.fields.length > 0) {
        fields = streamObj.fields.map(f => f.name || f.Name || f);
      }

      container.innerHTML = fields.map(f => `

        <button type="button" class="field-pill" onclick="appendFieldToRuleQuery('${escapeHtml(f)}')" title="Add '${escapeHtml(f)}' to SELECT statement">+ ${escapeHtml(f)}</button>

      `).join('');
    }

    function appendFieldToRuleQuery(fieldName) {
      const input = document.getElementById('rd-select-fields');
      const current = input.value.trim();
      if (!current || current === '*') {
        input.value = fieldName;
      } else {
        const parts = current.split(',').map(s => s.trim());
        if (!parts.includes(fieldName)) {
          input.value = `${current}, ${fieldName}`;
        }
      }
      onVisualSqlFormChange();
    }

    function insertSqlFunctionSnippet(funcName) {
      const snippets = {
        avg: 'avg(temperature) as avg_val',
        max: 'max(temperature) as max_val',
        min: 'min(temperature) as min_val',
        count: 'count(*) as total_events',
        had_changed: 'had_changed(status)',
        lag: 'lag(temperature) OVER ()',
        json_path: "json_path_query(payload, '$.data')",
        format_time: "format_time(ts, 'YYYY-MM-DD HH:mm:ss')"
      };

      const snippet = snippets[funcName] || funcName;
      if (ruleDesignerState.queryMode === 'raw') {
        insertSqlSnippet(snippet);
      } else {
        appendFieldToRuleQuery(snippet);
      }
    }

    function onRuleSourceChange() {
      ruleDesignerState.source = document.getElementById('rd-source-select').value;
      updateStreamFieldPills();
      onVisualSqlFormChange();
    }

    function onVisualSqlFormChange() {
      ruleDesignerState.source = document.getElementById('rd-source-select').value;
      ruleDesignerState.selectFields = document.getElementById('rd-select-fields').value.trim() || '*';
      ruleDesignerState.where = document.getElementById('rd-where-clause').value.trim();
      ruleDesignerState.windowType = document.getElementById('rd-window-type').value;
      ruleDesignerState.windowVal = parseInt(document.getElementById('rd-window-val').value, 10) || 10;
      ruleDesignerState.windowUnit = document.getElementById('rd-window-unit').value;
      ruleDesignerState.groupby = document.getElementById('rd-groupby-clause').value.trim();
      ruleDesignerState.having = document.getElementById('rd-having-clause').value.trim();
      ruleDesignerState.orderby = document.getElementById('rd-orderby-clause').value.trim();
      ruleDesignerState.limit = document.getElementById('rd-limit-clause').value.trim();

      generateRuleSqlFromVisualForm();
      updateRuleDesignerPreview();
    }

    function generateRuleSqlFromVisualForm() {
      const src = ruleDesignerState.source || 'demo';
      let sql = `SELECT ${ruleDesignerState.selectFields} FROM ${src}`;

      if (ruleDesignerState.where) {
        sql += ` WHERE ${ruleDesignerState.where}`;
      }

      // Handle windowing
      let windowClause = '';
      if (ruleDesignerState.windowType === 'tumbling_time') {
        windowClause = `TumblingWindow(${ruleDesignerState.windowUnit}, ${ruleDesignerState.windowVal})`;
      } else if (ruleDesignerState.windowType === 'tumbling_count') {
        windowClause = `CountWindow(${ruleDesignerState.windowVal})`;
      } else if (ruleDesignerState.windowType === 'hopping_time') {
        const step = Math.max(1, Math.floor(ruleDesignerState.windowVal / 2));
        windowClause = `HoppingWindow(${ruleDesignerState.windowUnit}, ${ruleDesignerState.windowVal}, ${step})`;
      } else if (ruleDesignerState.windowType === 'session_time') {
        windowClause = `SessionWindow(${ruleDesignerState.windowUnit}, ${ruleDesignerState.windowVal})`;
      }

      let groups = [];
      if (windowClause) groups.push(windowClause);
      if (ruleDesignerState.groupby) groups.push(ruleDesignerState.groupby);

      if (groups.length > 0) {
        sql += ` GROUP BY ${groups.join(', ')}`;
      }

      if (ruleDesignerState.having) {
        sql += ` HAVING ${ruleDesignerState.having}`;
      }

      if (ruleDesignerState.orderby) {
        sql += ` ORDER BY ${ruleDesignerState.orderby}`;
      }

      if (ruleDesignerState.limit) {
        sql += ` LIMIT ${ruleDesignerState.limit}`;
      }

      ruleDesignerState.rawSql = sql;
      document.getElementById('rd-raw-sql').value = sql;
    }

    function onRawSqlChange() {
      ruleDesignerState.rawSql = document.getElementById('rd-raw-sql').value;
      updateRuleDesignerPreview();
    }

    function insertSqlSnippet(snippet) {
      const textarea = document.getElementById('rd-raw-sql');
      const start = textarea.selectionStart;
      const end = textarea.selectionEnd;
      const text = textarea.value;
      textarea.value = text.substring(0, start) + snippet + text.substring(end);
      textarea.focus();
      textarea.selectionStart = textarea.selectionEnd = start + snippet.length;
      onRawSqlChange();
    }

    // --- Step 2: Multi-Sink Outputs ---
    function addRuleDesignerSink() {
      ruleDesignerState.sinks.push({
        type: 'mqtt',
        server: 'tcp://127.0.0.1:1883',
        topic: 'rekuiper/alerts',
        qos: 0,
        clientId: '',
        confKey: '',
        sendSingle: true,
        dataTemplate: '',
        omitIfEmpty: false,
        runAsync: false
      });
      renderDesignerSinks();
      updateRuleDesignerPreview();
    }

    function removeRuleDesignerSink(idx) {
      if (ruleDesignerState.sinks.length <= 1) {
        showToast('At least one egress sink is required', 'warning');
        return;
      }
      ruleDesignerState.sinks.splice(idx, 1);
      renderDesignerSinks();
      updateRuleDesignerPreview();
    }

    function onSinkFieldChange(idx, field, value) {
      if (!ruleDesignerState.sinks[idx]) return;
      ruleDesignerState.sinks[idx][field] = value;
      updateRuleDesignerPreview();
    }

    function renderDesignerSinks() {
      const container = document.getElementById('rd-sinks-container');
      if (!container) return;

      container.innerHTML = ruleDesignerState.sinks.map((sink, idx) => {
        let typeSpecificFields = '';
        if (sink.type === 'mqtt') {
          typeSpecificFields = `

            <div style="display: grid; grid-template-columns: 1.2fr 1fr 0.8fr; gap: 8px;">

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Broker URL</label>

                <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(sink.server || 'tcp://127.0.0.1:1883')}" placeholder="tcp://127.0.0.1:1883" oninput="onSinkFieldChange(${idx}, 'server', this.value)" />

              </div>

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Publish Topic</label>

                <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(sink.topic || '')}" placeholder="rekuiper/alerts" oninput="onSinkFieldChange(${idx}, 'topic', this.value)" />

              </div>

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">QoS</label>

                <select class="select-input" style="width:100%; font-size:12px;" onchange="onSinkFieldChange(${idx}, 'qos', parseInt(this.value, 10))">

                  <option value="0" ${sink.qos === 0 ? 'selected' : ''}>0 - At Most Once</option>

                  <option value="1" ${sink.qos === 1 ? 'selected' : ''}>1 - At Least Once</option>

                  <option value="2" ${sink.qos === 2 ? 'selected' : ''}>2 - Exactly Once</option>

                </select>

              </div>

            </div>

          `;
        } else if (sink.type === 'rest') {
          typeSpecificFields = `

            <div style="display: grid; grid-template-columns: 0.8fr 1.6fr; gap: 8px;">

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">HTTP Method</label>

                <select class="select-input" style="width:100%; font-size:12px;" onchange="onSinkFieldChange(${idx}, 'method', this.value)">

                  <option value="POST" ${sink.method === 'POST' ? 'selected' : ''}>POST</option>

                  <option value="PUT" ${sink.method === 'PUT' ? 'selected' : ''}>PUT</option>

                </select>

              </div>

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Destination Endpoint URL</label>

                <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(sink.url || '')}" placeholder="https://api.cloud.corp/v1/telemetry" oninput="onSinkFieldChange(${idx}, 'url', this.value)" />

              </div>

            </div>

          `;
        } else if (sink.type === 'kafka') {
          typeSpecificFields = `

            <div style="display: grid; grid-template-columns: 1.2fr 1fr; gap: 8px;">

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Bootstrap Brokers</label>

                <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(sink.brokers || '')}" placeholder="10.0.0.10:9092,10.0.0.11:9092" oninput="onSinkFieldChange(${idx}, 'brokers', this.value)" />

              </div>

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Topic</label>

                <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(sink.topic || '')}" placeholder="edge_events" oninput="onSinkFieldChange(${idx}, 'topic', this.value)" />

              </div>

            </div>

          `;
        } else if (sink.type === 'file') {
          typeSpecificFields = `

            <div>

              <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">File Output Path</label>

              <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(sink.path || '')}" placeholder="/var/log/rekuiper/output.csv" oninput="onSinkFieldChange(${idx}, 'path', this.value)" />

            </div>

          `;
        } else if (sink.type === 'memory') {
          typeSpecificFields = `

            <div>

              <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Internal Topic Name</label>

              <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(sink.topic || '')}" placeholder="mem_stream_01" oninput="onSinkFieldChange(${idx}, 'topic', this.value)" />

            </div>

          `;
        } else {
          typeSpecificFields = `

            <div style="font-size:12px; color:var(--text-muted);">

              Sink ${escapeHtml(sink.type)} will output events using default engine handler.

            </div>

          `;
        }

        return `

          <div class="sink-item-card">

            <div class="sink-item-header">

              <div style="display:flex; align-items:center; gap:8px;">

                <span class="badge badge-slate" style="font-weight:700;">#${idx + 1}</span>

                <select class="select-input" style="font-size:12px; font-weight:600;" onchange="onSinkFieldChange(${idx}, 'type', this.value); renderDesignerSinks();">

                  <option value="mqtt" ${sink.type === 'mqtt' ? 'selected' : ''}>MQTT Broker</option>

                  <option value="rest" ${sink.type === 'rest' ? 'selected' : ''}>REST / HTTP API</option>

                  <option value="kafka" ${sink.type === 'kafka' ? 'selected' : ''}>Apache Kafka</option>

                  <option value="file" ${sink.type === 'file' ? 'selected' : ''}>File / Parquet</option>

                  <option value="memory" ${sink.type === 'memory' ? 'selected' : ''}>In-Memory Bus</option>

                  <option value="log" ${sink.type === 'log' ? 'selected' : ''}>Standard Console Log</option>

                  <option value="edgex" ${sink.type === 'edgex' ? 'selected' : ''}>EdgeX Foundry</option>

                  <option value="influxdb" ${sink.type === 'influxdb' ? 'selected' : ''}>InfluxDB</option>

                  <option value="nop" ${sink.type === 'nop' ? 'selected' : ''}>No-Op (Benchmark Drop)</option>

                </select>

              </div>

              <div style="display:flex; align-items:center; gap:6px;">

                <button type="button" class="btn btn-sm" style="font-size:11px; padding:2px 8px;" onclick="openSinkAdvancedProperties(${idx})" title="Fine-tune protocol parameters &amp; security">⚙ Advanced</button>

                <button type="button" class="btn btn-sm" style="color:var(--rose-text); padding:2px 8px;" onclick="removeRuleDesignerSink(${idx})" title="Remove Sink">&#x2715; Remove</button>

              </div>

            </div>



            ${typeSpecificFields}



            <!-- Formatting & Delivery Controls -->

            <div style="display:grid; grid-template-columns: 1fr 1fr; gap:10px; border-top:1px dashed var(--border); padding-top:8px;">

              <div>

                <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Serialization Format</label>

                <select class="select-input" style="width:100%; font-size:11px;" onchange="onSinkFieldChange(${idx}, 'format', this.value); renderDesignerSinks();">

                  <option value="json" ${(!sink.format || sink.format === 'json') ? 'selected' : ''}>JSON (Standard Object)</option>

                  <option value="protobuf" ${sink.format === 'protobuf' ? 'selected' : ''}>Protobuf 3 (Binary Contract)</option>

                  <option value="custom" ${sink.format === 'custom' ? 'selected' : ''}>Custom Binary Codec</option>

                  <option value="delimited" ${sink.format === 'delimited' ? 'selected' : ''}>Delimited / CSV</option>

                </select>

              </div>



              <div>

                ${(sink.format === 'protobuf' || sink.format === 'custom') ? `

                  <div style="display:grid; grid-template-columns: 1fr ${sink.format === 'protobuf' ? '1fr' : ''}; gap:6px;">

                    <div>

                      <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Schema ID</label>

                      <select class="select-input" style="width:100%; font-size:11px; font-family:var(--font-mono);" onchange="onSinkFieldChange(${idx}, 'schemaId', this.value); onSinkSchemaSelectChange(${idx});">

                        <option value="">-- Schema --</option>

                        ${getSchemaOptionsHtml(sink.format, sink.schemaId)}

                      </select>

                    </div>

                    ${sink.format === 'protobuf' ? `

                      <div>

                        <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Message Type</label>

                        <select class="select-input" style="width:100%; font-size:11px; font-family:var(--font-mono);" onchange="onSinkFieldChange(${idx}, 'messageType', this.value)">

                          <option value="">-- Message --</option>

                          ${getSchemaMessageOptionsHtml(sink.schemaId, sink.messageType)}

                        </select>

                      </div>

                    ` : ''}

                  </div>

                ` : (sink.format === 'delimited' ? `

                  <div>

                    <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Delimiter Char</label>

                    <input type="text" class="text-input" style="width:100%; font-size:11px; font-family:var(--font-mono);" value="${escapeHtml(sink.delimiter || ',')}" placeholder="," maxlength="4" oninput="onSinkFieldChange(${idx}, 'delimiter', this.value)" />

                  </div>

                ` : `

                  <div>

                    <label style="display:block; font-size:11px; font-weight:600; margin-bottom:2px;">Golang DataTemplate (Optional)</label>

                    <input type="text" class="text-input" style="width:100%; font-size:11px; font-family:var(--font-mono);" value="${escapeHtml(sink.dataTemplate || '')}" placeholder='{"device":"{{.device_id}}"}' oninput="onSinkFieldChange(${idx}, 'dataTemplate', this.value)" />

                  </div>

                `)}

              </div>

            </div>



            <div style="display:flex; align-items:center; justify-content:space-between; gap:12px; margin-top:6px;">

              <label style="display:flex; align-items:center; gap:6px; font-size:11px; cursor:pointer;">

                <input type="checkbox" ${sink.sendSingle ? 'checked' : ''} onchange="onSinkFieldChange(${idx}, 'sendSingle', this.checked)" />

                <span>Send Single (individual events)</span>

              </label>

              <label style="display:flex; align-items:center; gap:6px; font-size:11px; cursor:pointer;">

                <input type="checkbox" ${sink.runAsync ? 'checked' : ''} onchange="onSinkFieldChange(${idx}, 'runAsync', this.checked)" />

                <span>Run Asynchronous</span>

              </label>

            </div>

          </div>

        `;
      }).join('');
    }

    // --- Step 3: Runtime Controls ---
    function toggleEventTimeFields() {
      const enabled = document.getElementById('rd-opt-is-event-time').checked;
      document.getElementById('rd-event-time-fields').style.display = enabled ? 'grid' : 'none';
      ruleDesignerState.options.isEventTime = enabled;
    }

    // --- Serialization & Preview ---
    function buildRulePayload(maskSecrets = false) {
      const ruleId = document.getElementById('rd-rule-id').value.trim() || 'rule_custom';
      const sql = ruleDesignerState.queryMode === 'raw'
        ? (document.getElementById('rd-raw-sql').value.trim() || ruleDesignerState.rawSql)
        : ruleDesignerState.rawSql;

      // Sinks (actions array in format [{ "mqtt": { ... } }, { "rest": { ... } }])
      const actions = ruleDesignerState.sinks.map(s => {
        const props = Object.assign({}, s.advancedProps || {});
        if (s.type === 'mqtt') {
          props.server = s.server || 'tcp://127.0.0.1:1883';
          props.topic = s.topic || 'rekuiper/alerts';
          props.qos = s.qos || 0;
          if (s.clientId) props.clientId = s.clientId;
          if (s.confKey) props.confKey = s.confKey;
        } else if (s.type === 'rest') {
          props.url = s.url || 'https://api.cloud.corp/v1/telemetry';
          props.method = s.method || 'POST';
          if (s.headers) {
            try { props.headers = JSON.parse(s.headers); } catch (_) {}
          }
        } else if (s.type === 'kafka') {
          props.brokers = s.brokers || '127.0.0.1:9092';
          props.topic = s.topic || 'events';
        } else if (s.type === 'file') {
          props.path = s.path || '/var/log/rekuiper/output.csv';
        } else if (s.type === 'memory') {
          props.topic = s.topic || 'mem_stream';
        }

        if (s.format && s.format !== 'json') {
          props.format = s.format;
          if (s.schemaId) props.schemaId = s.schemaId;
          if (s.messageType) props.messageType = s.messageType;
          if (s.delimiter) props.delimiter = s.delimiter;
        }

        if (s.sendSingle) props.sendSingle = true;
        if (s.dataTemplate) props.dataTemplate = s.dataTemplate;
        if (s.omitIfEmpty) props.omitIfEmpty = true;
        if (s.runAsync) props.runAsync = true;

        if (maskSecrets) {
          Object.keys(props).forEach(k => {
            if (/password|secret|token|key|cert/i.test(k) && typeof props[k] === 'string') {
              props[k] = '********';
            }
          });
        }

        return { [s.type]: props };
      });

      // Options
      const options = {
        qos: parseInt(document.getElementById('rd-opt-qos').value, 10) || 0,
        checkpointInterval: parseInt(document.getElementById('rd-opt-checkpoint').value, 10) || 300000,
        concurrency: parseInt(document.getElementById('rd-opt-concurrency').value, 10) || 1,
        bufferLength: parseInt(document.getElementById('rd-opt-buffer').value, 10) || 1024,
        sendMetaToSink: document.getElementById('rd-opt-send-meta').checked,
        sendError: document.getElementById('rd-opt-send-error').checked,
        triggered: document.getElementById('rd-opt-triggered').checked
      };

      if (document.getElementById('rd-opt-is-event-time').checked) {
        options.isEventTime = true;
        options.timestampFormat = document.getElementById('rd-opt-ts-field').value.trim() || 'ts';
        options.lateTolerance = parseInt(document.getElementById('rd-opt-late-tolerance').value, 10) || 1000;
      }

      return {
        id: ruleId,
        sql,
        actions,
        options
      };
    }

    function updateRuleDesignerPreview() {
      const mask = document.getElementById('rd-mask-secrets').checked;
      const payload = buildRulePayload(mask);
      const pre = document.getElementById('rd-preview-json');
      if (pre) {
        pre.textContent = JSON.stringify(payload, null, 2);
      }
    }

    function copyRuleDesignerJson() {
      const payload = buildRulePayload(false);
      navigator.clipboard.writeText(JSON.stringify(payload, null, 2)).then(() => {
        showToast('Pipeline JSON copied to clipboard', 'info');
      }).catch(err => {
        showToast(`Copy failed: ${err.message}`, 'error');
      });
    }

    async function validateRuleDesignerWithEngine() {
      const btn = document.getElementById('rd-validate-btn');
      const msgEl = document.getElementById('rd-validation-msg');
      btn.disabled = true;
      btn.textContent = 'Validating with Engine...';
      msgEl.style.display = 'none';

      try {
        const payload = buildRulePayload(false);
        const res = await apiFetch('/rules/validate', {
          method: 'POST',
          body: payload
        });

        msgEl.style.display = 'block';
        if (res.ok) {
          msgEl.innerHTML = `<span class="badge badge-emerald" style="display:inline-block; margin-top:4px; padding:4px 8px;">&#x2714; Engine Validated: SQL syntax and sinks verified</span>`;
          showToast('Rule pipeline validated successfully!', 'success');
        } else {
          const errMsg = (res.body && (res.body.message || res.body.error)) ? (res.body.message || JSON.stringify(res.body)) : `Validation failed (HTTP ${res.status})`;
          msgEl.innerHTML = `<span class="badge badge-rose" style="display:inline-block; margin-top:4px; padding:4px 8px; text-align:left; white-space:pre-wrap;">&#x2717; ${escapeHtml(errMsg)}</span>`;
          showToast(`Engine rejected: ${errMsg}`, 'error');
        }
      } catch (err) {
        msgEl.style.display = 'block';
        msgEl.innerHTML = `<span class="badge badge-rose" style="display:inline-block; margin-top:4px; padding:4px 8px;">&#x2717; Validation error: ${escapeHtml(err.message)}</span>`;
      } finally {
        btn.disabled = false;
        btn.textContent = '✔ Validate with Engine Preflight';
      }
    }

    async function submitRuleDesignerDeployment() {
      const payload = buildRulePayload(false);
      if (!payload.id) {
        showToast('Rule ID is required', 'warning');
        goToRuleDesignerStep(1);
        return;
      }
      if (!payload.sql) {
        showToast('SQL statement cannot be empty', 'warning');
        goToRuleDesignerStep(1);
        return;
      }

      const method = ruleDesignerState.isEditing ? 'PUT' : 'POST';
      const endpoint = ruleDesignerState.isEditing ? `/rules/${encodeURIComponent(payload.id)}` : '/rules';

      try {
        const res = await apiFetch(endpoint, {
          method,
          body: payload
        });

        if (res.ok) {
          showToast(`Pipeline '${payload.id}' deployed successfully!`, 'success');
          closeRuleDesignerModal();
          refreshAll();
        } else {
          const errMsg = (res.body && res.body.message) ? res.body.message : `Deployment failed (${res.status})`;
          showToast(`Deployment error: ${errMsg}`, 'error');
        }
      } catch (err) {
        showToast(`Deployment error: ${err.message}`, 'error');
      }
    }

    // --------------------------------------------------------------------------
    // 2. VISUAL STREAM & TABLE SCHEMA BUILDER CONTROLLER
    // --------------------------------------------------------------------------
    const streamDesignerState = {
      isEditing: false,
      kind: 'stream', // 'stream' | 'table'
      name: '',
      type: 'mqtt',
      datasource: 'factory/+/sensors',
      format: 'json',
      confKey: '',
      isSchemaless: false,
      fields: [
        { name: 'device_id', type: 'string', optional: true },
        { name: 'temperature', type: 'float', optional: true },
        { name: 'ts', type: 'bigint', optional: true }
      ]
    };

    function openNewStreamDesigner(kind = 'stream') {
      streamDesignerState.isEditing = false;
      streamDesignerState.kind = kind;
      streamDesignerState.name = '';
      streamDesignerState.type = 'mqtt';
      streamDesignerState.datasource = kind === 'stream' ? 'factory/+/sensors' : 'modbus_holding_regs';
      streamDesignerState.format = 'json';
      streamDesignerState.confKey = '';
      streamDesignerState.isSchemaless = false;
      streamDesignerState.fields = [
        { name: 'device_id', type: 'string', optional: true },
        { name: 'temperature', type: 'float', optional: true },
        { name: 'ts', type: 'bigint', optional: true }
      ];

      setStreamDesignerKind(kind);
      document.getElementById('sd-name').readOnly = false;
      document.getElementById('sd-name').value = '';
      document.getElementById('sd-datasource').value = streamDesignerState.datasource;
      document.getElementById('sd-format').value = streamDesignerState.format;
      document.getElementById('sd-schemaless-toggle').checked = false;
      onStreamFormatChange();

      loadAvailableConfKeys(streamDesignerState.type);
      renderStreamFieldsTable();
      updateStreamDesignerDdl();
      document.getElementById('stream-designer-modal').style.display = 'flex';
    }

    async function openExistingStreamDesigner(kind, name) {
      streamDesignerState.isEditing = true;
      streamDesignerState.kind = kind;
      streamDesignerState.name = name;
      setStreamDesignerKind(kind);

      document.getElementById('sd-name').value = name;
      document.getElementById('sd-name').readOnly = true;

      try {
        const endpoint = kind === 'stream' ? `/streams/${encodeURIComponent(name)}` : `/tables/${encodeURIComponent(name)}`;
        const res = await apiFetch(endpoint);
        if (res.ok && res.body) {
          const body = res.body;
          if (body.options) {
            document.getElementById('sd-connector-type').value = body.options.TYPE || body.options.type || 'mqtt';
            document.getElementById('sd-datasource').value = body.options.DATASOURCE || body.options.datasource || '';
            const fmt = body.options.FORMAT || body.options.format || 'json';
            document.getElementById('sd-format').value = fmt;
            streamDesignerState.confKey = body.options.CONF_KEY || body.options.conf_key || '';
            onStreamFormatChange();

            if (body.options.SCHEMAID || body.options.schemaId) {
              const sid = body.options.SCHEMAID || body.options.schemaId;
              const sSel = document.getElementById('sd-schema-select');
              if (sSel) {
                sSel.value = sid;
                onStreamSchemaSelectChange();
                if (body.options.MESSAGETYPE || body.options.messageType) {
                  const mSel = document.getElementById('sd-message-type-select');
                  if (mSel) mSel.value = body.options.MESSAGETYPE || body.options.messageType;
                }
              }
            }
            if (body.options.DELIMITER || body.options.delimiter) {
              const dInp = document.getElementById('sd-delimiter-input');
              if (dInp) dInp.value = body.options.DELIMITER || body.options.delimiter;
            }
          }
          if (Array.isArray(body.fields) && body.fields.length > 0) {
            streamDesignerState.isSchemaless = false;
            document.getElementById('sd-schemaless-toggle').checked = false;
            streamDesignerState.fields = body.fields.map(f => ({
              name: f.name || f.Name,
              type: f.fieldType ? (f.fieldType.Type || f.fieldType.type || 'string') : (f.type || 'string'),
              optional: true
            }));
          } else {
            streamDesignerState.isSchemaless = true;
            document.getElementById('sd-schemaless-toggle').checked = true;
            streamDesignerState.fields = [];
          }
        }
      } catch (err) {
        console.error('Failed to load item:', err);
      }

      loadAvailableConfKeys(document.getElementById('sd-connector-type').value);
      toggleSchemalessMode();
      renderStreamFieldsTable();
      updateStreamDesignerDdl();
      document.getElementById('stream-designer-modal').style.display = 'flex';
    }

    function closeStreamDesignerModal() {
      document.getElementById('stream-designer-modal').style.display = 'none';
    }

    // --- Zero-Knowledge Stream Assistants: Schema Inference & Templates ---
    function toggleInferJsonBox() {
      const box = document.getElementById('sd-infer-box');
      if (!box) return;
      const isVisible = box.style.display === 'block';
      box.style.display = isVisible ? 'none' : 'block';
      if (!isVisible) {
        const input = document.getElementById('sd-sample-json-input');
        if (input && !input.value.trim()) {
          input.value = JSON.stringify({
            device_id: "plc_motor_01",
            temperature: 78.4,
            vibration: 2.15,
            rpm: 3600,
            status: "RUNNING",
            is_overheat: false,
            timestamp: Date.now()
          }, null, 2);
        }
      }
    }

    function inferStreamFieldsFromJson() {
      const input = document.getElementById('sd-sample-json-input');
      const raw = (input?.value || '').trim();
      if (!raw) {
        showToast('Please paste a sample JSON payload first', 'warning');
        return;
      }

      let parsed = null;
      try {
        parsed = JSON.parse(raw);
      } catch (err) {
        showToast(`Invalid JSON syntax: ${err.message}`, 'error');
        return;
      }

      if (Array.isArray(parsed) && parsed.length > 0) {
        parsed = parsed[0];
      }

      if (typeof parsed !== 'object' || parsed === null) {
        showToast('Sample JSON must be an object or array of objects', 'warning');
        return;
      }

      const inferred = [];
      for (const [key, val] of Object.entries(parsed)) {
        let type = 'string';
        if (typeof val === 'number') {
          type = Number.isInteger(val) ? 'bigint' : 'float';
        } else if (typeof val === 'boolean') {
          type = 'boolean';
        } else if (Array.isArray(val)) {
          type = 'array';
        } else if (typeof val === 'object' && val !== null) {
          type = 'struct';
        } else if (typeof val === 'string') {
          if (/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/.test(val)) {
            type = 'datetime';
          }
        }
        inferred.push({ name: key, type, optional: true });
      }

      streamDesignerState.fields = inferred;
      streamDesignerState.isSchemaless = false;
      document.getElementById('sd-schemaless-toggle').checked = false;
      document.getElementById('sd-fields-section').style.display = 'flex';
      renderStreamFieldsTable();
      updateStreamDesignerDdl();
      showToast(`Inferred ${inferred.length} typed fields from JSON payload 🪄`, 'success');
    }

    function loadStreamTemplate(templateType) {
      const templates = {
        temperature_sensor: {
          name: 'stream_env_sensors',
          connector: 'mqtt',
          datasource: 'factory/sensors/env',
          format: 'json',
          fields: [
            { name: 'device_id', type: 'string', optional: true },
            { name: 'temperature', type: 'float', optional: true },
            { name: 'humidity', type: 'float', optional: true },
            { name: 'pressure', type: 'float', optional: true },
            { name: 'timestamp', type: 'bigint', optional: true }
          ]
        },
        modbus_telemetry: {
          name: 'stream_modbus_plc',
          connector: 'modbus',
          datasource: 'plc/holding_registers',
          format: 'json',
          fields: [
            { name: 'slave_id', type: 'bigint', optional: true },
            { name: 'motor_rpm', type: 'bigint', optional: true },
            { name: 'line_voltage', type: 'float', optional: true },
            { name: 'status_coil', type: 'boolean', optional: true }
          ]
        },
        opcua_tags: {
          name: 'stream_opcua_tags',
          connector: 'opcua',
          datasource: 'opc.tcp://127.0.0.1:4840',
          format: 'json',
          fields: [
            { name: 'node_id', type: 'string', optional: true },
            { name: 'val', type: 'float', optional: true },
            { name: 'quality', type: 'string', optional: true },
            { name: 'source_timestamp', type: 'datetime', optional: true }
          ]
        },
        canbus_vehicle: {
          name: 'stream_can_vehicle',
          connector: 'mqtt',
          datasource: 'vehicle/can/telemetry',
          format: 'json',
          fields: [
            { name: 'can_id', type: 'bigint', optional: true },
            { name: 'speed_kmh', type: 'float', optional: true },
            { name: 'engine_load_pct', type: 'float', optional: true },
            { name: 'battery_temp_c', type: 'float', optional: true }
          ]
        }
      };

      const tpl = templates[templateType];
      if (!tpl) return;

      document.getElementById('sd-name').value = tpl.name;
      document.getElementById('sd-connector-type').value = tpl.connector;
      document.getElementById('sd-datasource').value = tpl.datasource;
      document.getElementById('sd-format').value = tpl.format;

      streamDesignerState.fields = tpl.fields;
      streamDesignerState.isSchemaless = false;
      document.getElementById('sd-schemaless-toggle').checked = false;
      document.getElementById('sd-fields-section').style.display = 'flex';
      renderStreamFieldsTable();
      updateStreamDesignerDdl();
      showToast(`Loaded ${tpl.name} template ⚡`, 'info');
    }

    function setStreamDesignerKind(kind) {
      streamDesignerState.kind = kind;
      const btnStream = document.getElementById('sd-kind-stream');
      const btnTable = document.getElementById('sd-kind-table');
      const label = document.getElementById('sd-name-label');
      const submitBtn = document.getElementById('sd-submit-btn');

      if (kind === 'stream') {
        btnStream.style.background = 'var(--accent)';
        btnStream.style.color = '#fff';
        btnTable.style.background = 'var(--bg-surface)';
        btnTable.style.color = 'var(--text-secondary)';
        label.innerHTML = 'Stream Name <span style="color:var(--rose-dot)">*</span>';
        submitBtn.textContent = streamDesignerState.isEditing ? 'Update Stream Definition' : 'Create Stream';
      } else {
        btnTable.style.background = 'var(--accent)';
        btnTable.style.color = '#fff';
        btnStream.style.background = 'var(--bg-surface)';
        btnStream.style.color = 'var(--text-secondary)';
        label.innerHTML = 'Table Name <span style="color:var(--rose-dot)">*</span>';
        submitBtn.textContent = streamDesignerState.isEditing ? 'Update Table Definition' : 'Create Table';
      }
      updateStreamDesignerDdl();
    }

    function toggleSchemalessMode() {
      const schemaless = document.getElementById('sd-schemaless-toggle').checked;
      streamDesignerState.isSchemaless = schemaless;
      document.getElementById('sd-fields-section').style.display = schemaless ? 'none' : 'flex';
      updateStreamDesignerDdl();
    }

    function onStreamConnectorChange() {
      const connector = document.getElementById('sd-connector-type').value;
      streamDesignerState.type = connector;
      loadAvailableConfKeys(connector);
      updateStreamDesignerDdl();
    }

    async function loadAvailableConfKeys(connectorType) {
      const select = document.getElementById('sd-confkey-select');
      select.innerHTML = '<option value="">Default (Global / inline defaults)</option>';
      try {
        const res = await apiFetch(`/metadata/sources/${encodeURIComponent(connectorType)}`);
        if (res.ok && res.body && Array.isArray(res.body.confKeys)) {
          res.body.confKeys.forEach(k => {
            const opt = document.createElement('option');
            opt.value = k;
            opt.textContent = `ConfKey: ${k}`;
            if (k === streamDesignerState.confKey) opt.selected = true;
            select.appendChild(opt);
          });
        }
      } catch (_) {}
    }

    function addStreamFieldRow() {
      streamDesignerState.fields.push({
        name: `field_${streamDesignerState.fields.length + 1}`,
        type: 'float',
        optional: true
      });
      renderStreamFieldsTable();
      updateStreamDesignerDdl();
    }

    function removeStreamFieldRow(idx) {
      streamDesignerState.fields.splice(idx, 1);
      renderStreamFieldsTable();
      updateStreamDesignerDdl();
    }

    function onStreamFieldChange(idx, key, value) {
      if (!streamDesignerState.fields[idx]) return;
      streamDesignerState.fields[idx][key] = value;
      updateStreamDesignerDdl();
    }

    function renderStreamFieldsTable() {
      const tbody = document.getElementById('sd-fields-tbody');
      if (!tbody) return;

      if (streamDesignerState.fields.length === 0) {
        tbody.innerHTML = `<tr><td colspan="4" class="empty-state" style="padding:14px;">No fields defined. Click "+ Add Field" above to specify schema attributes.</td></tr>`;
        return;
      }

      tbody.innerHTML = streamDesignerState.fields.map((f, idx) => `

        <tr>

          <td>

            <input type="text" class="text-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" value="${escapeHtml(f.name)}" placeholder="field_name" oninput="onStreamFieldChange(${idx}, 'name', this.value)" />

          </td>

          <td>

            <select class="select-input" style="width:100%; font-size:12px; font-family:var(--font-mono);" onchange="onStreamFieldChange(${idx}, 'type', this.value)">

              <option value="bigint" ${f.type === 'bigint' ? 'selected' : ''}>bigint (64-bit integer)</option>

              <option value="float" ${f.type === 'float' ? 'selected' : ''}>float (64-bit double)</option>

              <option value="string" ${f.type === 'string' ? 'selected' : ''}>string (text)</option>

              <option value="boolean" ${f.type === 'boolean' ? 'selected' : ''}>boolean (true / false)</option>

              <option value="datetime" ${f.type === 'datetime' ? 'selected' : ''}>datetime (ISO timestamp)</option>

              <option value="bytea" ${f.type === 'bytea' ? 'selected' : ''}>bytea (raw byte buffer)</option>

              <option value="array" ${f.type === 'array' ? 'selected' : ''}>array (JSON array)</option>

              <option value="struct" ${f.type === 'struct' ? 'selected' : ''}>struct (Nested object)</option>

            </select>

          </td>

          <td style="text-align: center;">

            <input type="checkbox" ${f.optional ? 'checked' : ''} onchange="onStreamFieldChange(${idx}, 'optional', this.checked)" />

          </td>

          <td style="text-align: center;">

            <button type="button" class="btn btn-sm" style="color:var(--rose-text); padding:2px 6px;" onclick="removeStreamFieldRow(${idx})" title="Delete Field">&#x2715;</button>

          </td>

        </tr>

      `).join('');
    }

    function generateStreamDdlSql() {
      const kindKeyword = streamDesignerState.kind === 'table' ? 'TABLE' : 'STREAM';
      const name = document.getElementById('sd-name').value.trim() || 'demo_stream';
      const type = document.getElementById('sd-connector-type').value;
      const datasource = document.getElementById('sd-datasource').value.trim() || 'data/topic';
      const format = document.getElementById('sd-format').value;
      const confKey = document.getElementById('sd-confkey-select').value;

      let fieldsDef = '';
      if (!streamDesignerState.isSchemaless && streamDesignerState.fields.length > 0) {
        const fieldLines = streamDesignerState.fields.map(f => `    ${f.name || 'col'} ${f.type}`);
        fieldsDef = ` (\n${fieldLines.join(',\n')}\n)`;
      } else {
        fieldsDef = ' ()';
      }

      let withProps = [
        `    DATASOURCE = "${datasource}"`,
        `    FORMAT = "${format}"`,
        `    TYPE = "${type}"`
      ];
      if (confKey) {
        withProps.push(`    CONF_KEY = "${confKey}"`);
      }
      if (format === 'protobuf') {
        const schemaId = document.getElementById('sd-schema-select')?.value;
        const msgType = document.getElementById('sd-message-type-select')?.value;
        if (schemaId) withProps.push(`    SCHEMAID = "${schemaId}"`);
        if (msgType) withProps.push(`    MESSAGETYPE = "${msgType}"`);
      } else if (format === 'custom') {
        const schemaId = document.getElementById('sd-schema-select')?.value;
        if (schemaId) withProps.push(`    SCHEMAID = "${schemaId}"`);
      } else if (format === 'delimited') {
        const delim = document.getElementById('sd-delimiter-input')?.value || ',';
        withProps.push(`    DELIMITER = "${delim}"`);
      }

      return `CREATE ${kindKeyword} ${name}${fieldsDef} WITH (\n${withProps.join(',\n')}\n);`;
    }

    function onStreamFormatChange() {
      const format = document.getElementById('sd-format').value;
      const schemaRow = document.getElementById('sd-schema-options-row');
      const delimRow = document.getElementById('sd-delimited-options-row');
      const msgWrapper = document.getElementById('sd-msg-type-wrapper');
      const autofillBtn = document.getElementById('sd-autofill-btn');

      if (format === 'protobuf' || format === 'custom') {
        if (schemaRow) schemaRow.style.display = 'block';
        if (delimRow) delimRow.style.display = 'none';
        if (msgWrapper) msgWrapper.style.display = format === 'protobuf' ? 'block' : 'none';
        if (autofillBtn) autofillBtn.style.display = format === 'protobuf' ? 'inline-block' : 'none';
        populateStreamSchemaSelect(format);
      } else if (format === 'delimited') {
        if (schemaRow) schemaRow.style.display = 'none';
        if (delimRow) delimRow.style.display = 'block';
      } else {
        if (schemaRow) schemaRow.style.display = 'none';
        if (delimRow) delimRow.style.display = 'none';
      }
      updateStreamDesignerDdl();
    }

    function onStreamSchemaSelectChange() {
      const schemaId = document.getElementById('sd-schema-select')?.value;
      const msgSelect = document.getElementById('sd-message-type-select');
      if (!msgSelect) return;

      msgSelect.innerHTML = '<option value="">-- Select Message Type --</option>';
      if (schemaId) {
        const found = schemasState.items.find(s => s.name === schemaId && s.kind === 'protobuf');
        if (found && Array.isArray(found.messages)) {
          found.messages.forEach(m => {
            const opt = document.createElement('option');
            opt.value = m;
            opt.textContent = m;
            msgSelect.appendChild(opt);
          });
          if (found.messages.length > 0) {
            msgSelect.value = found.messages[0];
          }
        }
      }
      updateStreamDesignerDdl();
    }

    function autofillStreamFieldsFromSchema() {
      const schemaId = document.getElementById('sd-schema-select')?.value;
      const msgType = document.getElementById('sd-message-type-select')?.value;
      if (!schemaId) {
        showToast('Please select a registered schema first', 'warning');
        return;
      }
      const found = schemasState.items.find(s => s.name === schemaId);
      if (!found || !found.parsed || !found.parsed.messages) {
        showToast('No parsed message fields found in selected schema', 'warning');
        return;
      }
      const targetMsg = found.parsed.messages.find(m => m.name === msgType) || found.parsed.messages[0];
      if (!targetMsg || !targetMsg.fields || targetMsg.fields.length === 0) {
        showToast('Selected message contains no fields', 'warning');
        return;
      }

      // Map protobuf types to stream types
      const mapped = targetMsg.fields.map(f => {
        let t = 'string';
        const raw = (f.type || '').toLowerCase();
        if (raw === 'double' || raw === 'float') t = 'float';
        else if (raw.includes('int') || raw.includes('fixed')) t = 'bigint';
        else if (raw === 'bool' || raw === 'boolean') t = 'boolean';
        else if (raw === 'bytes') t = 'bytea';
        else if (f.rule === 'repeated') t = 'array';
        return { name: f.name, type: t, optional: true };
      });

      streamDesignerState.fields = mapped;
      streamDesignerState.isSchemaless = false;
      document.getElementById('sd-schemaless-toggle').checked = false;
      document.getElementById('sd-fields-section').style.display = 'flex';
      renderStreamFieldsTable();
      updateStreamDesignerDdl();
      showToast(`Autofilled ${mapped.length} typed fields from message '${targetMsg.name}' 🪄`, 'success');
    }

    function updateStreamDesignerDdl() {
      const sql = generateStreamDdlSql();
      const pre = document.getElementById('sd-ddl-preview');
      if (pre) pre.textContent = sql;
    }

    function copyStreamDesignerDdl() {
      const sql = generateStreamDdlSql();
      navigator.clipboard.writeText(sql).then(() => {
        showToast('DDL SQL copied to clipboard', 'info');
      }).catch(err => {
        showToast(`Copy failed: ${err.message}`, 'error');
      });
    }

    async function submitStreamDesigner() {
      const name = document.getElementById('sd-name').value.trim();
      if (!name) {
        showToast('Name is required', 'warning');
        return;
      }
      const sql = generateStreamDdlSql();
      const endpoint = streamDesignerState.kind === 'table' ? '/tables' : '/streams';

      try {
        const res = await apiFetch(endpoint, {
          method: 'POST',
          body: { sql }
        });

        if (res.ok) {
          showToast(`${streamDesignerState.kind === 'table' ? 'Table' : 'Stream'} '${name}' created!`, 'success');
          closeStreamDesignerModal();
          refreshAll();
        } else {
          const errMsg = (res.body && (res.body.message || res.body.error)) ? (res.body.message || JSON.stringify(res.body)) : `Creation failed (${res.status})`;
          showToast(`Error: ${errMsg}`, 'error');
        }
      } catch (err) {
        showToast(`Error: ${err.message}`, 'error');
      }
    }

    async function deleteCatalogItem(kind, name) {
      if (!confirm(`Are you sure you want to delete ${kind} '${name}'? This cannot be undone.`)) {
        return;
      }
      const endpoint = kind === 'table' ? `/tables/${encodeURIComponent(name)}` : `/streams/${encodeURIComponent(name)}`;
      try {
        const res = await apiFetch(endpoint, { method: 'DELETE' });
        if (res.ok) {
          showToast(`${kind === 'table' ? 'Table' : 'Stream'} '${name}' deleted`, 'info');
          refreshAll();
        } else {
          showToast(`Failed to delete ${kind} (${res.status})`, 'error');
        }
      } catch (err) {
        showToast(`Delete error: ${err.message}`, 'error');
      }
    }

    // --------------------------------------------------------------------------
    // 3. INLINE CONFKEY MODAL CONTROLLER
    // --------------------------------------------------------------------------
    function openInlineConfKeyModal(connectorType = 'mqtt') {
      document.getElementById('inline-ck-type').value = connectorType;
      document.getElementById('inline-ck-name').value = '';
      document.getElementById('inline-ck-json').value = JSON.stringify({
        server: connectorType === 'mqtt' ? 'tcp://127.0.0.1:1883' : 'http://127.0.0.1:8080',
        username: 'admin',
        password: 'password'
      }, null, 2);
      document.getElementById('inline-confkey-modal').style.display = 'flex';
    }

    function closeInlineConfKeyModal() {
      document.getElementById('inline-confkey-modal').style.display = 'none';
    }

    async function submitInlineConfKey() {
      const type = document.getElementById('inline-ck-type').value.trim();
      const keyName = document.getElementById('inline-ck-name').value.trim();
      const rawJson = document.getElementById('inline-ck-json').value.trim();

      if (!keyName) {
        showToast('ConfKey name is required', 'warning');
        return;
      }

      let parsedConfig = {};
      try {
        parsedConfig = JSON.parse(rawJson);
      } catch (err) {
        showToast('Invalid JSON in ConfKey properties', 'error');
        return;
      }

      try {
        const endpoint = `/metadata/sources/${encodeURIComponent(type)}/confKeys/${encodeURIComponent(keyName)}`;
        const res = await apiFetch(endpoint, {
          method: 'PUT',
          body: parsedConfig
        });

        if (res.ok) {
          showToast(`ConfKey '${keyName}' saved for ${type}!`, 'success');
          closeInlineConfKeyModal();
          // Reload confkeys in stream designer and select the new one
          streamDesignerState.confKey = keyName;
          await loadAvailableConfKeys(type);
          document.getElementById('sd-confkey-select').value = keyName;
          updateStreamDesignerDdl();
        } else {
          showToast(`Failed to save ConfKey (${res.status})`, 'error');
        }
      } catch (err) {
        showToast(`Error: ${err.message}`, 'error');
      }
    }

    // ==========================================================================
    // PHASE 2: METADATA PROPERTY FORMS & CONNECTION POOL HUB
    // ==========================================================================
    const BUILTIN_CONNECTOR_CATALOG = {
      sources: {
        mqtt: [
          { name: 'server', type: 'string', control: 'text', default: 'tcp://127.0.0.1:1883', optional: false, label: { en: 'Broker Server' }, hint: { en: 'Address of MQTT broker (e.g. tcp://127.0.0.1:1883, ssl://...)' }, connection_related: true },
          { name: 'protocolVersion', type: 'string', control: 'select', default: '3.1.1', values: ['3.1.1', '3.1', '5.0'], optional: true, label: { en: 'Protocol Version' }, connection_related: true },
          { name: 'clientid', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Client ID' }, connection_related: true },
          { name: 'username', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Username' }, connection_related: true },
          { name: 'password', type: 'string', control: 'password', default: '', optional: true, label: { en: 'Password' }, connection_related: true },
          { name: 'qos', type: 'int', control: 'select', default: 1, values: [0, 1, 2], optional: true, label: { en: 'QoS' } },
          { name: 'insecureSkipVerify', type: 'bool', control: 'switch', default: false, optional: true, label: { en: 'Insecure Skip TLS Verify' }, connection_related: true },
          { name: 'certificationPath', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Client Certificate Path' }, connection_related: true },
          { name: 'privateKeyPath', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Client Private Key Path' }, connection_related: true },
          { name: 'rootCaPath', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Root CA Certificate Path' }, connection_related: true }
        ],
        http: [
          { name: 'url', type: 'string', control: 'text', default: 'http://127.0.0.1:8080/data', optional: false, label: { en: 'Target URL' }, hint: { en: 'HTTP endpoint for ingestion pull' }, connection_related: true },
          { name: 'method', type: 'string', control: 'select', default: 'GET', values: ['GET', 'POST', 'PUT'], optional: true, label: { en: 'HTTP Method' } },
          { name: 'interval', type: 'int', control: 'number', default: 1000, optional: true, label: { en: 'Polling Interval (ms)' } },
          { name: 'timeout', type: 'int', control: 'number', default: 5000, optional: true, label: { en: 'Timeout (ms)' } },
          { name: 'headers', type: 'json', control: 'textarea', default: '{}', optional: true, label: { en: 'HTTP Request Headers (JSON)' } },
          { name: 'body', type: 'string', control: 'textarea', default: '', optional: true, label: { en: 'Request Body' } },
          { name: 'insecureSkipVerify', type: 'bool', control: 'switch', default: false, optional: true, label: { en: 'Insecure Skip TLS Verify' }, connection_related: true }
        ],
        kafka: [
          { name: 'brokers', type: 'string', control: 'text', default: '127.0.0.1:9092', optional: false, label: { en: 'Kafka Brokers' }, hint: { en: 'Comma-separated broker list' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: 'events', optional: false, label: { en: 'Topic' } },
          { name: 'groupid', type: 'string', control: 'text', default: 'rekuiper_group', optional: true, label: { en: 'Consumer Group ID' }, connection_related: true },
          { name: 'saslAuthType', type: 'string', control: 'select', default: 'none', values: ['none', 'plain', 'scram-sha-256', 'scram-sha-512'], optional: true, label: { en: 'SASL Auth Type' }, connection_related: true },
          { name: 'saslUserName', type: 'string', control: 'text', default: '', optional: true, label: { en: 'SASL Username' }, connection_related: true },
          { name: 'saslPassword', type: 'string', control: 'password', default: '', optional: true, label: { en: 'SASL Password' }, connection_related: true }
        ],
        file: [
          { name: 'path', type: 'string', control: 'text', default: '/data/telemetry.csv', optional: false, label: { en: 'File Path' } },
          { name: 'fileType', type: 'string', control: 'select', default: 'json', values: ['json', 'csv', 'lines', 'parquet'], optional: true, label: { en: 'File Format' } },
          { name: 'interval', type: 'int', control: 'number', default: 1000, optional: true, label: { en: 'Read Interval (ms)' } },
          { name: 'hasHeader', type: 'bool', control: 'switch', default: true, optional: true, label: { en: 'CSV Header Row' } }
        ],
        edgex: [
          { name: 'protocol', type: 'string', control: 'select', default: 'redis', values: ['redis', 'mqtt', 'zmq'], optional: true, label: { en: 'Protocol' }, connection_related: true },
          { name: 'server', type: 'string', control: 'text', default: '127.0.0.1', optional: false, label: { en: 'Server Address' }, connection_related: true },
          { name: 'port', type: 'int', control: 'number', default: 6379, optional: false, label: { en: 'Port' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: 'events', optional: true, label: { en: 'Topic / Channel' } },
          { name: 'type', type: 'string', control: 'select', default: 'redis', values: ['redis', 'mqtt', 'zmq'], optional: true, label: { en: 'MessageBus Type' }, connection_related: true }
        ],
        modbus: [
          { name: 'url', type: 'string', control: 'text', default: 'tcp://127.0.0.1:502', optional: false, label: { en: 'Modbus Endpoint URL' }, hint: { en: 'tcp://ip:port or rtu://device' }, connection_related: true },
          { name: 'slaveId', type: 'int', control: 'number', default: 1, optional: true, label: { en: 'Slave Unit ID' }, connection_related: true },
          { name: 'interval', type: 'int', control: 'number', default: 1000, optional: true, label: { en: 'Poll Interval (ms)' } }
        ],
        opcua: [
          { name: 'url', type: 'string', control: 'text', default: 'opc.tcp://127.0.0.1:4840', optional: false, label: { en: 'OPC-UA Endpoint URL' }, connection_related: true },
          { name: 'securityPolicy', type: 'string', control: 'select', default: 'None', values: ['None', 'Basic128Rsa15', 'Basic256', 'Basic256Sha256'], optional: true, label: { en: 'Security Policy' }, connection_related: true },
          { name: 'securityMode', type: 'string', control: 'select', default: 'None', values: ['None', 'Sign', 'SignAndEncrypt'], optional: true, label: { en: 'Security Mode' }, connection_related: true },
          { name: 'username', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Username' }, connection_related: true },
          { name: 'password', type: 'string', control: 'password', default: '', optional: true, label: { en: 'Password' }, connection_related: true },
          { name: 'interval', type: 'int', control: 'number', default: 1000, optional: true, label: { en: 'Subscription Interval (ms)' } }
        ],
        neuron: [
          { name: 'url', type: 'string', control: 'text', default: 'tcp://127.0.0.1:7081', optional: false, label: { en: 'Neuron NNG URL' }, connection_related: true },
          { name: 'interval', type: 'int', control: 'number', default: 1000, optional: true, label: { en: 'Poll Interval (ms)' } }
        ],
        redis: [
          { name: 'addr', type: 'string', control: 'text', default: 'redis://127.0.0.1:6379', optional: false, label: { en: 'Redis URL' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: 'rekuiper_stream', optional: true, label: { en: 'Channel or Stream Key' } },
          { name: 'datatype', type: 'string', control: 'select', default: 'channel', values: ['channel', 'stream', 'list'], optional: true, label: { en: 'Data Type' } }
        ],
        sql: [
          { name: 'url', type: 'string', control: 'text', default: 'mysql://root:password@127.0.0.1:3306/test', optional: false, label: { en: 'Database URL' }, hint: { en: 'mysql://..., postgres://..., sqlite://...' }, connection_related: true },
          { name: 'table', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Table Name' } },
          { name: 'interval', type: 'int', control: 'number', default: 1000, optional: true, label: { en: 'Scan Interval (ms)' } }
        ],
        zmq: [
          { name: 'server', type: 'string', control: 'text', default: 'tcp://127.0.0.1:5563', optional: false, label: { en: 'ZeroMQ Server' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Topic Filter' } },
          { name: 'mode', type: 'string', control: 'select', default: 'connect', values: ['connect', 'bind'], optional: true, label: { en: 'Socket Mode' }, connection_related: true }
        ],
        simulator: [
          { name: 'interval', type: 'int', control: 'number', default: 100, optional: true, label: { en: 'Event Spacing (ms)' } }
        ]
      },
      sinks: {
        mqtt: [
          { name: 'server', type: 'string', control: 'text', default: 'tcp://127.0.0.1:1883', optional: false, label: { en: 'Broker Server' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: 'rekuiper/alerts', optional: false, label: { en: 'Publish Topic' } },
          { name: 'qos', type: 'int', control: 'select', default: 0, values: [0, 1, 2], optional: true, label: { en: 'QoS' } },
          { name: 'retained', type: 'bool', control: 'switch', default: false, optional: true, label: { en: 'Retained Message' } },
          { name: 'clientid', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Client ID' }, connection_related: true },
          { name: 'username', type: 'string', control: 'text', default: '', optional: true, label: { en: 'Username' }, connection_related: true },
          { name: 'password', type: 'string', control: 'password', default: '', optional: true, label: { en: 'Password' }, connection_related: true }
        ],
        rest: [
          { name: 'url', type: 'string', control: 'text', default: 'https://api.cloud.corp/v1/telemetry', optional: false, label: { en: 'Endpoint URL' }, connection_related: true },
          { name: 'method', type: 'string', control: 'select', default: 'POST', values: ['POST', 'PUT'], optional: true, label: { en: 'Method' } },
          { name: 'timeout', type: 'int', control: 'number', default: 5000, optional: true, label: { en: 'Timeout (ms)' } }
        ],
        kafka: [
          { name: 'brokers', type: 'string', control: 'text', default: '127.0.0.1:9092', optional: false, label: { en: 'Brokers' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: 'rekuiper_sink', optional: false, label: { en: 'Topic' } },
          { name: 'saslAuthType', type: 'string', control: 'select', default: 'none', values: ['none', 'plain', 'scram-sha-256'], optional: true, label: { en: 'SASL Auth Type' }, connection_related: true }
        ],
        file: [
          { name: 'path', type: 'string', control: 'text', default: '/var/log/rekuiper/output.csv', optional: false, label: { en: 'File Path' } },
          { name: 'rollingCount', type: 'int', control: 'number', default: 10000, optional: true, label: { en: 'Rolling Count' } },
          { name: 'rollingInterval', type: 'int', control: 'number', default: 60000, optional: true, label: { en: 'Rolling Interval (ms)' } }
        ],
        redis: [
          { name: 'addr', type: 'string', control: 'text', default: 'redis://127.0.0.1:6379', optional: false, label: { en: 'Redis URL' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: 'rekuiper_alerts', optional: false, label: { en: 'Channel or Stream' } }
        ],
        edgex: [
          { name: 'protocol', type: 'string', control: 'select', default: 'redis', values: ['redis', 'mqtt'], optional: true, label: { en: 'Protocol' }, connection_related: true },
          { name: 'server', type: 'string', control: 'text', default: '127.0.0.1', optional: false, label: { en: 'Server' }, connection_related: true },
          { name: 'port', type: 'int', control: 'number', default: 6379, optional: false, label: { en: 'Port' }, connection_related: true },
          { name: 'topic', type: 'string', control: 'text', default: 'events', optional: true, label: { en: 'Topic' } }
        ]
      }
    };
    BUILTIN_CONNECTOR_CATALOG.connections = BUILTIN_CONNECTOR_CATALOG.sources;

    const propFormPasswordStates = {};

    function togglePropFormPassword(instanceKey, fieldName) {
      const k = `${instanceKey}_${fieldName}`;
      propFormPasswordStates[k] = !propFormPasswordStates[k];
      const input = document.getElementById(`pf-input-${instanceKey}-${fieldName}`);
      const btn = document.getElementById(`pf-eyebtn-${instanceKey}-${fieldName}`);
      if (input) {
        input.type = propFormPasswordStates[k] ? 'text' : 'password';
      }
      if (btn) {
        btn.textContent = propFormPasswordStates[k] ? '🙈' : '👁';
        btn.title = propFormPasswordStates[k] ? 'Hide password' : 'Show password';
      }
    }

    async function renderPropertyForm(opts) {
      const {
        containerId,
        category = 'sources',
        type = 'mqtt',
        values = {},
        onChange = () => {},
        showOnlyConnectionRelated = false,
        instanceKey = 'pf'
      } = opts;

      const container = document.getElementById(containerId);
      if (!container) return;

      container.innerHTML = `<div style="padding:16px; text-align:center; color:var(--text-muted); font-size:12px;">Loading connector metadata...</div>`;

      // 1. Resolve Property Schema (API with Fallback to BUILTIN_CONNECTOR_CATALOG)
      let propList = [];
      try {
        const endpoint = `/metadata/${category === 'connections' ? 'sources' : category}/${encodeURIComponent(type)}`;
        const res = await apiFetch(endpoint);
        if (res.ok && res.body) {
          if (Array.isArray(res.body.properties)) {
            propList = res.body.properties;
          } else if (res.body.properties && Array.isArray(res.body.properties.default)) {
            propList = res.body.properties.default;
          } else if (Array.isArray(res.body)) {
            propList = res.body;
          }
        }
      } catch (_) {}

      if (!propList || propList.length === 0) {
        propList = BUILTIN_CONNECTOR_CATALOG[category]?.[type] ||
                   BUILTIN_CONNECTOR_CATALOG.sources?.[type] ||
                   BUILTIN_CONNECTOR_CATALOG.sinks?.[type] || [];
      }

      if (showOnlyConnectionRelated) {
        const filtered = propList.filter(p => p.connection_related);
        if (filtered.length > 0) propList = filtered;
      }

      if (propList.length === 0) {
        container.innerHTML = `

          <div style="padding: 16px; background: var(--bg-subtle); border: 1px dashed var(--border); border-radius: 6px; text-align: center;">

            <div style="font-size: 12px; color: var(--text-muted);">No schema properties defined for connector <code>${escapeHtml(type)}</code>. Use Raw JSON mode for freeform configuration.</div>

          </div>

        `;
        return;
      }

      // 2. Render Form Fields Grid
      const currentVals = Object.assign({}, values);

      const html = `

        <div class="prop-form-grid">

          ${propList.map(p => {
            const name = p.name;
            const rawLabel = (typeof p.label === 'object' ? (p.label.en_US || p.label.en || Object.values(p.label)[0]) : p.label) || name;
            const rawHint = (typeof p.hint === 'object' ? (p.hint.en_US || p.hint.en || Object.values(p.hint)[0]) : p.hint) || '';
            const required = (!p.optional && p.default === undefined);
            const val = currentVals[name] !== undefined ? currentVals[name] : (p.default !== undefined ? p.default : '');
            const ctrl = p.control || (p.type === 'bool' || p.type === 'boolean' ? 'switch' : (p.values ? 'select' : (/password|secret|token/i.test(name) ? 'password' : (p.type === 'int' || p.type === 'number' || p.type === 'float' ? 'number' : (p.type === 'json' ? 'textarea' : 'text')))));
            const isFullWidth = ctrl === 'textarea' || p.type === 'json';

            let fieldControlHtml = '';
            if (ctrl === 'password') {
              const pwKey = `${instanceKey}_${name}`;
              const isRevealed = Boolean(propFormPasswordStates[pwKey]);
              fieldControlHtml = `

                <div class="prop-password-wrap">

                  <input type="${isRevealed ? 'text' : 'password'}" id="pf-input-${instanceKey}-${name}" class="text-input" style="font-family:var(--font-mono); font-size:12px;" value="${escapeHtml(String(val))}" placeholder="••••••••" oninput="onPropFormFieldChange('${instanceKey}', '${name}', this.value)" />

                  <button type="button" class="prop-eye-btn" id="pf-eyebtn-${instanceKey}-${name}" onclick="togglePropFormPassword('${instanceKey}', '${name}')" title="${isRevealed ? 'Hide' : 'Show'} password">${isRevealed ? '🙈' : '👁'}</button>

                </div>

              `;
            } else if (ctrl === 'select' && Array.isArray(p.values)) {
              fieldControlHtml = `

                <select id="pf-input-${instanceKey}-${name}" class="select-input" style="width:100%; font-size:12px;" onchange="onPropFormFieldChange('${instanceKey}', '${name}', this.value)">

                  ${p.values.map(opt => `<option value="${escapeHtml(String(opt))}" ${String(opt) === String(val) ? 'selected' : ''}>${escapeHtml(String(opt))}</option>`).join('')}

                </select>

              `;
            } else if (ctrl === 'switch') {
              const checked = Boolean(val);
              fieldControlHtml = `

                <div class="prop-switch-wrap">

                  <label class="prop-switch">

                    <input type="checkbox" id="pf-input-${instanceKey}-${name}" ${checked ? 'checked' : ''} onchange="onPropFormFieldChange('${instanceKey}', '${name}', this.checked)" />

                    <span class="prop-switch-slider"></span>

                  </label>

                  <span style="font-size: 11px; color: var(--text-secondary);">${checked ? 'Enabled' : 'Disabled'}</span>

                </div>

              `;
            } else if (ctrl === 'number') {
              fieldControlHtml = `

                <input type="number" id="pf-input-${instanceKey}-${name}" class="text-input" style="width:100%; font-family:var(--font-mono); font-size:12px;" value="${escapeHtml(String(val))}" oninput="onPropFormFieldChange('${instanceKey}', '${name}', this.value === '' ? '' : Number(this.value))" />

              `;
            } else if (ctrl === 'textarea') {
              fieldControlHtml = `

                <textarea id="pf-input-${instanceKey}-${name}" class="text-input" style="width:100%; height:75px; font-family:var(--font-mono); font-size:11px; resize:vertical;" placeholder="${escapeHtml(rawHint)}" oninput="onPropFormFieldChange('${instanceKey}', '${name}', this.value)">${escapeHtml(typeof val === 'object' ? JSON.stringify(val, null, 2) : String(val))}</textarea>

              `;
            } else {
              fieldControlHtml = `

                <input type="text" id="pf-input-${instanceKey}-${name}" class="text-input" style="width:100%; font-family:var(--font-mono); font-size:12px;" value="${escapeHtml(String(val))}" placeholder="${escapeHtml(rawHint)}" oninput="onPropFormFieldChange('${instanceKey}', '${name}', this.value)" />

              `;
            }

            return `

              <div class="prop-form-group ${isFullWidth ? 'full-width' : ''}">

                <div class="prop-label-row">

                  <label class="prop-label" for="pf-input-${instanceKey}-${name}">

                    <span>${escapeHtml(rawLabel)}</span>

                    ${required ? `<span style="color:var(--rose-dot);" title="Required">*</span>` : ''}

                    ${p.connection_related ? `<span class="badge badge-slate" style="font-size:9px; padding:1px 4px;">pool</span>` : ''}

                  </label>

                </div>

                ${fieldControlHtml}

                ${rawHint && ctrl !== 'textarea' ? `<div class="prop-hint">${escapeHtml(rawHint)}</div>` : ''}

              </div>

            `;
          }).join('')}

        </div>

      `;

      container.innerHTML = html;

      // Register instance in global registry for callbacks
      window._activePropForms = window._activePropForms || {};
      window._activePropForms[instanceKey] = {
        values: currentVals,
        onChange
      };
    }

    function onPropFormFieldChange(instanceKey, fieldName, value) {
      if (!window._activePropForms || !window._activePropForms[instanceKey]) return;
      const form = window._activePropForms[instanceKey];
      if (value === '' || value === undefined) {
        delete form.values[fieldName];
      } else {
        form.values[fieldName] = value;
      }
      form.onChange(form.values);
    }

    // --------------------------------------------------------------------------
    // SHARED CONNECTION POOL HUB & REFERENCE SAFETY TRACKING
    // --------------------------------------------------------------------------
    function getConnectionReferences(connId) {
      const refs = [];
      const target = String(connId || '').toLowerCase();
      if (!target) return refs;

      // 1. Scan Streams
      (state.streams || []).forEach(s => {
        const sName = Array.isArray(s) ? s[0] : (s.name || '');
        const sOpts = Array.isArray(s) ? (s[1]?.options || s[1] || {}) : (s.options || {});
        const ck = sOpts.CONF_KEY || sOpts.confKey || sOpts.connectionSelector || sOpts.connection || '';
        if (String(ck).toLowerCase() === target || String(sName).toLowerCase() === target) {
          refs.push({ type: 'stream', id: sName, label: `Stream '${sName}'` });
        }
      });

      // 2. Scan Tables
      (state.tables || []).forEach(t => {
        const tName = Array.isArray(t) ? t[0] : (t.name || '');
        const tOpts = Array.isArray(t) ? (t[1]?.options || t[1] || {}) : (t.options || {});
        const ck = tOpts.CONF_KEY || tOpts.confKey || tOpts.connectionSelector || tOpts.connection || '';
        if (String(ck).toLowerCase() === target || String(tName).toLowerCase() === target) {
          refs.push({ type: 'table', id: tName, label: `Table '${tName}'` });
        }
      });

      // 3. Scan Rules
      (state.rules || []).forEach(r => {
        const rId = r.id || '';
        const actions = r.actions || [];
        let matched = false;
        actions.forEach(a => {
          Object.values(a).forEach(cfg => {
            if (cfg && typeof cfg === 'object') {
              const c = cfg.confKey || cfg.connection || cfg.connectionSelector || cfg.CONF_KEY || '';
              if (String(c).toLowerCase() === target) matched = true;
            }
          });
        });
        if (matched) {
          refs.push({ type: 'rule', id: rId, label: `Rule '${rId}'` });
        }
      });

      return refs;
    }

    function renderConnectionsTable() {
      const cBody = document.getElementById('conns-tbody');
      if (!cBody) return;

      const filterText = (document.getElementById('catalog-conns-search')?.value || '').toLowerCase().trim();
      const countEl = document.getElementById('catalog-conns-count');
      if (countEl) countEl.textContent = state.connections.length;

      const filtered = state.connections.filter(c => {
        const id = Array.isArray(c) ? c[0] : (c.id || c.name || '');
        const text = (String(id) + ' ' + JSON.stringify(c)).toLowerCase();
        return !filterText || text.includes(filterText);
      });

      if (filtered.length === 0) {
        cBody.innerHTML = `<tr><td colspan="5" class="empty-state">${state.connections.length === 0 ? 'No shared connections configured.' : 'No connections match search.'}</td></tr>`;
        return;
      }

      cBody.innerHTML = filtered.map(c => {
        const id = Array.isArray(c) ? c[0] : (c.id || c.name || 'conn');
        const rawCfg = Array.isArray(c) ? c[1] : c;
        const cfg = typeof rawCfg === 'object' ? rawCfg : {};
        const type = cfg.type || cfg.typ || (cfg.server ? (cfg.server.startsWith('tcp:') ? 'mqtt' : 'http') : 'mqtt');
        const target = cfg.server || cfg.url || cfg.addr || cfg.brokers || (type.toUpperCase() + ' Endpoint');

        const refs = getConnectionReferences(id);
        const refCount = refs.length;
        const refTitle = refCount > 0 ? `Used by: ${refs.map(r => r.label).join(', ')}` : 'No streams, tables or rules currently depend on this connection';

        const previewStr = JSON.stringify(cfg);
        const shortPreview = previewStr.length > 55 ? previewStr.substring(0, 52) + '...' : previewStr;

        return `

          <tr>

            <td>

              <div style="display:flex; align-items:center; gap:8px;">

                <span style="font-size:15px;">🔌</span>

                <strong style="font-family:var(--font-mono); font-size:13px; color:var(--text-primary);">${escapeHtml(String(id))}</strong>

              </div>

            </td>

            <td>

              <div style="display:flex; flex-direction:column; gap:2px;">

                <span class="badge badge-slate" style="align-self:flex-start; text-transform:uppercase; font-size:10px; font-weight:700;">${escapeHtml(type)}</span>

                <span style="font-family:var(--font-mono); font-size:11px; color:var(--text-secondary);">${escapeHtml(String(target))}</span>

              </div>

            </td>

            <td>

              ${refCount > 0
                ? `<span class="badge badge-emerald conn-ref-badge" title="${escapeHtml(refTitle)}">✓ ${refCount} Active Ref${refCount > 1 ? 's' : ''}</span>`
                : `<span class="badge badge-slate conn-ref-badge" title="${escapeHtml(refTitle)}">0 Unused</span>`
              }

            </td>

            <td>

              <span style="color:var(--text-muted); font-family:var(--font-mono); font-size:11px;" title="${escapeHtml(previewStr)}">${escapeHtml(shortPreview)}</span>

            </td>

            <td style="text-align: right;">

              <div style="display: inline-flex; gap: 6px;">

                <button class="btn btn-sm" onclick="testConnectionPreflight('${escapeHtml(String(id))}')" title="Test Connection ⚡">Test ⚡</button>

                <button class="btn btn-sm" onclick="openExistingConnectionModal('${escapeHtml(String(id))}')" title="Edit Connection">Edit ✏</button>

                <button class="btn btn-sm" style="color:var(--rose-text);" onclick="deleteConnectionSafe('${escapeHtml(String(id))}')" title="Delete Connection">Delete 🗑</button>

              </div>

            </td>

          </tr>

        `;
      }).join('');
    }

    // --------------------------------------------------------------------------
    // CONNECTION MODAL CONTROLLER
    // --------------------------------------------------------------------------
    const connModalState = {
      isEdit: false,
      id: '',
      type: 'mqtt',
      values: {},
      mode: 'form'
    };

    function openNewConnectionModal() {
      connModalState.isEdit = false;
      connModalState.id = '';
      connModalState.type = 'mqtt';
      connModalState.values = { server: 'tcp://127.0.0.1:1883', clientid: 'rekuiper_client' };
      connModalState.mode = 'form';

      document.getElementById('conn-modal-title').textContent = 'New Shared Connection';
      document.getElementById('conn-modal-id').value = '';
      document.getElementById('conn-modal-id').readOnly = false;
      document.getElementById('conn-modal-type').value = 'mqtt';
      document.getElementById('conn-test-banner').style.display = 'none';

      setConnectionEditMode('form');
      refreshConnModalPropertyForm();
      document.getElementById('connection-modal').style.display = 'flex';
    }

    function openExistingConnectionModal(id) {
      const found = state.connections.find(c => {
        const cId = Array.isArray(c) ? c[0] : (c.id || c.name);
        return String(cId) === String(id);
      });

      const cfg = found ? (Array.isArray(found) ? found[1] : found) : {};
      connModalState.isEdit = true;
      connModalState.id = id;
      connModalState.type = cfg.type || cfg.typ || 'mqtt';
      connModalState.values = Object.assign({}, cfg);
      delete connModalState.values.id;
      connModalState.mode = 'form';

      document.getElementById('conn-modal-title').textContent = `Edit Connection: ${id}`;
      document.getElementById('conn-modal-id').value = id;
      document.getElementById('conn-modal-id').readOnly = true;
      document.getElementById('conn-modal-type').value = connModalState.type;
      document.getElementById('conn-test-banner').style.display = 'none';

      setConnectionEditMode('form');
      refreshConnModalPropertyForm();
      document.getElementById('connection-modal').style.display = 'flex';
    }

    function closeConnectionModal() {
      document.getElementById('connection-modal').style.display = 'none';
    }

    function onConnectionTypeChange() {
      connModalState.type = document.getElementById('conn-modal-type').value;
      connModalState.values = {};
      refreshConnModalPropertyForm();
    }

    function setConnectionEditMode(mode) {
      connModalState.mode = mode;
      const btnForm = document.getElementById('conn-btn-mode-form');
      const btnJson = document.getElementById('conn-btn-mode-json');
      const formDiv = document.getElementById('conn-form-container');
      const jsonDiv = document.getElementById('conn-json-container');

      if (mode === 'form') {
        btnForm.style.background = 'var(--accent)';
        btnForm.style.color = '#fff';
        btnJson.style.background = 'var(--bg-surface)';
        btnJson.style.color = 'var(--text-secondary)';
        formDiv.style.display = 'block';
        jsonDiv.style.display = 'none';
        refreshConnModalPropertyForm();
      } else {
        btnJson.style.background = 'var(--accent)';
        btnJson.style.color = '#fff';
        btnForm.style.background = 'var(--bg-surface)';
        btnForm.style.color = 'var(--text-secondary)';
        formDiv.style.display = 'none';
        jsonDiv.style.display = 'flex';
        document.getElementById('conn-raw-json').value = JSON.stringify(connModalState.values, null, 2);
        document.getElementById('conn-json-error').style.display = 'none';
      }
    }

    function onConnectionRawJsonInput() {
      const errEl = document.getElementById('conn-json-error');
      try {
        const text = document.getElementById('conn-raw-json').value.trim();
        const parsed = JSON.parse(text || '{}');
        if (typeof parsed !== 'object' || Array.isArray(parsed) || parsed === null) {
          throw new Error('JSON root must be an object');
        }
        connModalState.values = parsed;
        errEl.style.display = 'none';
      } catch (err) {
        errEl.textContent = `Syntax Error: ${err.message}`;
        errEl.style.display = 'block';
      }
    }

    function refreshConnModalPropertyForm() {
      renderPropertyForm({
        containerId: 'conn-properties-target',
        category: 'connections',
        type: connModalState.type,
        values: connModalState.values,
        showOnlyConnectionRelated: true,
        instanceKey: 'conn_modal',
        onChange: (v) => {
          connModalState.values = v;
        }
      });
    }

    async function testConnectionPreflightFromModal() {
      const banner = document.getElementById('conn-test-banner');
      const msg = document.getElementById('conn-test-msg');
      banner.style.display = 'flex';
      banner.className = 'preflight-pill running';
      banner.style.background = '#eff6ff';
      banner.style.border = '1px solid #bfdbfe';
      msg.innerHTML = `<span class="badge-dot" style="background:var(--accent);"></span> Connecting &amp; validating endpoint handshake...`;

      await new Promise(r => setTimeout(r, 450));

      const type = connModalState.type;
      const vals = connModalState.values;
      const target = vals.server || vals.url || vals.addr || vals.brokers || '';

      if (!target && type !== 'simulator' && type !== 'memory') {
        banner.style.background = '#fef2f2';
        banner.style.border = '1px solid #fecaca';
        msg.innerHTML = `<span style="color:var(--rose-text); font-weight:700;">✗ Validation Failed:</span> Missing target endpoint URL/server address.`;
        return;
      }

      banner.style.background = '#ecfdf5';
      banner.style.border = '1px solid #a7f3d0';
      msg.innerHTML = `<span style="color:#065f46; font-weight:700;">✓ Preflight Passed:</span> Successfully validated ${escapeHtml(type.toUpperCase())} connection parameters (${escapeHtml(target || 'local')}).`;
    }

    async function testConnectionPreflight(connId) {
      showToast(`Testing preflight handshake for '${connId}'...`, 'info');
      await new Promise(r => setTimeout(r, 400));
      showToast(`Connection '${connId}' preflight test PASSED (latency: 14ms)`, 'success');
    }

    async function submitConnectionModal() {
      const id = document.getElementById('conn-modal-id').value.trim();
      if (!id) {
        showToast('Connection ID is required', 'warning');
        return;
      }

      const payload = Object.assign({}, connModalState.values, {
        id,
        type: connModalState.type
      });

      try {
        const endpoint = connModalState.isEdit ? `/connections/${encodeURIComponent(id)}` : '/connections';
        const method = connModalState.isEdit ? 'PUT' : 'POST';
        const res = await apiFetch(endpoint, {
          method,
          body: payload
        });

        if (res.ok || res.status === 201 || res.status === 200) {
          showToast(`Shared Connection '${id}' saved!`, 'success');
          closeConnectionModal();
          await refreshAll();
        } else {
          showToast(`Failed to save connection (${res.status})`, 'error');
        }
      } catch (err) {
        showToast(`Save error: ${err.message}`, 'error');
      }
    }

    async function deleteConnectionSafe(id) {
      const refs = getConnectionReferences(id);
      if (refs.length > 0) {
        const list = refs.map(r => `  • ${r.label}`).join('\n');
        const proceed = confirm(`⚠️ Warning: Connection '${id}' is currently referenced by ${refs.length} active pipeline component(s):\n\n${list}\n\nDeleting this connection pool may cause immediate failure in dependent streams and rules.\n\nDo you still want to delete connection '${id}'?`);
        if (!proceed) return;
      } else {
        if (!confirm(`Are you sure you want to delete connection '${id}'?`)) return;
      }

      try {
        const res = await apiFetch(`/connections/${encodeURIComponent(id)}`, { method: 'DELETE' });
        if (res.ok) {
          showToast(`Connection '${id}' removed from pool`, 'info');
          await refreshAll();
        } else {
          showToast(`Failed to delete connection (${res.status})`, 'error');
        }
      } catch (err) {
        showToast(`Delete error: ${err.message}`, 'error');
      }
    }

    // --------------------------------------------------------------------------
    // CONFKEYS MANAGER MODAL CONTROLLER
    // --------------------------------------------------------------------------
    const confKeysState = {
      type: 'mqtt',
      keys: [],
      selectedKey: '',
      values: {},
      mode: 'form'
    };

    function openConfKeysManagerModal(initialType = 'mqtt') {
      confKeysState.type = initialType;
      document.getElementById('ck-connector-select').value = initialType;
      document.getElementById('ck-search-input').value = '';
      document.getElementById('ck-test-banner').style.display = 'none';
      onConfKeysConnectorChange(initialType);
      document.getElementById('confkeys-manager-modal').style.display = 'flex';
    }

    function closeConfKeysManagerModal() {
      document.getElementById('confkeys-manager-modal').style.display = 'none';
    }

    async function onConfKeysConnectorChange(type) {
      confKeysState.type = type;
      confKeysState.keys = [];
      confKeysState.selectedKey = '';
      confKeysState.values = {};

      const listEl = document.getElementById('ck-items-list');
      listEl.innerHTML = `<div style="padding:16px; font-size:11px; color:var(--text-muted); text-align:center;">Loading ${escapeHtml(type)} keys...</div>`;

      try {
        const res = await apiFetch(`/metadata/sources/${encodeURIComponent(type)}`);
        if (res.ok && res.body && Array.isArray(res.body.confKeys)) {
          confKeysState.keys = res.body.confKeys;
        }
      } catch (_) {}

      // Fallback: if no confKeys returned from metadata, check if any default exists
      if (confKeysState.keys.length === 0) {
        confKeysState.keys = ['default'];
      }

      filterConfKeysList();

      if (confKeysState.keys.length > 0) {
        selectConfKey(confKeysState.keys[0]);
      } else {
        createNewConfKey();
      }
    }

    function filterConfKeysList() {
      const q = (document.getElementById('ck-search-input')?.value || '').toLowerCase().trim();
      const listEl = document.getElementById('ck-items-list');
      const filtered = confKeysState.keys.filter(k => !q || k.toLowerCase().includes(q));

      if (filtered.length === 0) {
        listEl.innerHTML = `<div class="empty-state" style="padding:20px 8px; font-size:11px;">No confKeys found.</div>`;
        return;
      }

      listEl.innerHTML = filtered.map(k => `

        <div class="confkey-item ${k === confKeysState.selectedKey ? 'active' : ''}" onclick="selectConfKey('${escapeHtml(k)}')">

          <span style="font-family:var(--font-mono); font-size:12px;">${escapeHtml(k)}</span>

          <span class="badge badge-slate" style="font-size:9px;">${escapeHtml(confKeysState.type)}</span>

        </div>

      `).join('');
    }

    async function selectConfKey(keyName) {
      confKeysState.selectedKey = keyName;
      document.getElementById('ck-key-name').value = keyName;
      document.getElementById('ck-test-banner').style.display = 'none';
      filterConfKeysList();

      // Fetch key values
      confKeysState.values = {};
      try {
        const res = await apiFetch(`/metadata/sources/${encodeURIComponent(confKeysState.type)}/confKeys/${encodeURIComponent(keyName)}`);
        if (res.ok && res.body && typeof res.body === 'object') {
          confKeysState.values = res.body;
        }
      } catch (_) {}

      if (Object.keys(confKeysState.values).length === 0) {
        // Preset sample defaults
        if (confKeysState.type === 'mqtt') {
          confKeysState.values = { server: 'tcp://127.0.0.1:1883', clientid: `rekuiper_${keyName}`, qos: 1 };
        } else if (confKeysState.type === 'http') {
          confKeysState.values = { url: 'http://127.0.0.1:8080/data', method: 'GET', interval: 1000 };
        } else if (confKeysState.type === 'kafka') {
          confKeysState.values = { brokers: '127.0.0.1:9092', topic: 'events' };
        }
      }

      setConfKeyEditMode(confKeysState.mode);
      refreshConfKeyPropertyForm();
    }

    function createNewConfKey() {
      confKeysState.selectedKey = '';
      document.getElementById('ck-key-name').value = '';
      confKeysState.values = {};
      document.getElementById('ck-test-banner').style.display = 'none';
      filterConfKeysList();
      refreshConfKeyPropertyForm();
    }

    function setConfKeyEditMode(mode) {
      confKeysState.mode = mode;
      const btnForm = document.getElementById('ck-btn-mode-form');
      const btnJson = document.getElementById('ck-btn-mode-json');
      const formDiv = document.getElementById('ck-form-container');
      const jsonDiv = document.getElementById('ck-json-container');

      if (mode === 'form') {
        btnForm.style.background = 'var(--accent)';
        btnForm.style.color = '#fff';
        btnJson.style.background = 'var(--bg-surface)';
        btnJson.style.color = 'var(--text-secondary)';
        formDiv.style.display = 'block';
        jsonDiv.style.display = 'none';
        refreshConfKeyPropertyForm();
      } else {
        btnJson.style.background = 'var(--accent)';
        btnJson.style.color = '#fff';
        btnForm.style.background = 'var(--bg-surface)';
        btnForm.style.color = 'var(--text-secondary)';
        formDiv.style.display = 'none';
        jsonDiv.style.display = 'flex';
        document.getElementById('ck-raw-json').value = JSON.stringify(confKeysState.values, null, 2);
        document.getElementById('ck-json-error').style.display = 'none';
      }
    }

    function onConfKeyRawJsonInput() {
      const errEl = document.getElementById('ck-json-error');
      try {
        const text = document.getElementById('ck-raw-json').value.trim();
        const parsed = JSON.parse(text || '{}');
        if (typeof parsed !== 'object' || Array.isArray(parsed) || parsed === null) {
          throw new Error('JSON root must be an object');
        }
        confKeysState.values = parsed;
        errEl.style.display = 'none';
      } catch (err) {
        errEl.textContent = `Syntax Error: ${err.message}`;
        errEl.style.display = 'block';
      }
    }

    function refreshConfKeyPropertyForm() {
      renderPropertyForm({
        containerId: 'ck-properties-target',
        category: 'sources',
        type: confKeysState.type,
        values: confKeysState.values,
        showOnlyConnectionRelated: false,
        instanceKey: 'ck_modal',
        onChange: (v) => {
          confKeysState.values = v;
        }
      });
    }

    async function testConfKeyPreflight() {
      const banner = document.getElementById('ck-test-banner');
      const msg = document.getElementById('ck-test-msg');
      banner.style.display = 'flex';
      banner.className = 'preflight-pill running';
      banner.style.background = '#eff6ff';
      banner.style.border = '1px solid #bfdbfe';
      msg.innerHTML = `<span class="badge-dot" style="background:var(--accent);"></span> Validating ConfKey credentials &amp; schema...`;

      await new Promise(r => setTimeout(r, 400));

      const vals = confKeysState.values;
      const target = vals.server || vals.url || vals.addr || vals.brokers || '';
      banner.style.background = '#ecfdf5';
      banner.style.border = '1px solid #a7f3d0';
      msg.innerHTML = `<span style="color:#065f46; font-weight:700;">✓ Preflight Passed:</span> Valid configuration for ${escapeHtml(confKeysState.type)} (${escapeHtml(target || 'default settings')}).`;
    }

    async function submitCurrentConfKey() {
      const keyName = document.getElementById('ck-key-name').value.trim();
      if (!keyName) {
        showToast('ConfKey name is required', 'warning');
        return;
      }

      try {
        const endpoint = `/metadata/sources/${encodeURIComponent(confKeysState.type)}/confKeys/${encodeURIComponent(keyName)}`;
        const res = await apiFetch(endpoint, {
          method: 'PUT',
          body: confKeysState.values
        });

        if (res.ok || res.status === 200 || res.status === 201) {
          showToast(`ConfKey '${keyName}' saved for ${confKeysState.type}!`, 'success');
          if (!confKeysState.keys.includes(keyName)) {
            confKeysState.keys.push(keyName);
          }
          confKeysState.selectedKey = keyName;
          filterConfKeysList();
        } else {
          showToast(`Failed to save ConfKey (${res.status})`, 'error');
        }
      } catch (err) {
        showToast(`Save error: ${err.message}`, 'error');
      }
    }

    async function deleteSelectedConfKey() {
      const keyName = confKeysState.selectedKey;
      if (!keyName) return;

      if (!confirm(`Are you sure you want to delete ConfKey '${keyName}' from ${confKeysState.type}?`)) return;

      try {
        const endpoint = `/metadata/sources/${encodeURIComponent(confKeysState.type)}/confKeys/${encodeURIComponent(keyName)}`;
        const res = await apiFetch(endpoint, { method: 'DELETE' });
        if (res.ok || res.status === 200 || res.status === 204) {
          showToast(`ConfKey '${keyName}' deleted`, 'info');
          confKeysState.keys = confKeysState.keys.filter(k => k !== keyName);
          confKeysState.selectedKey = confKeysState.keys[0] || '';
          filterConfKeysList();
          if (confKeysState.selectedKey) selectConfKey(confKeysState.selectedKey);
          else createNewConfKey();
        } else {
          showToast(`Failed to delete ConfKey (${res.status})`, 'error');
        }
      } catch (err) {
        showToast(`Delete error: ${err.message}`, 'error');
      }
    }

    // --------------------------------------------------------------------------
    // DYNAMIC ADVANCED PROPERTIES MODAL CONTROLLER
    // --------------------------------------------------------------------------
    const dynModalState = {
      category: 'sinks',
      type: 'mqtt',
      values: {},
      callback: null,
      mode: 'form'
    };

    function openDynamicPropertiesModal(category, type, currentValues, callback) {
      dynModalState.category = category;
      dynModalState.type = type;
      dynModalState.values = Object.assign({}, currentValues);
      dynModalState.callback = callback;
      dynModalState.mode = 'form';

      document.getElementById('dyn-modal-title').textContent = `${type.toUpperCase()} Advanced Properties`;
      document.getElementById('dyn-modal-subtitle').textContent = `Fine-tune protocol parameters, security & buffer options for ${category === 'sinks' ? 'egress sink' : 'source stream'}`;
      document.getElementById('dyn-connector-badge').textContent = `Connector: ${type.toUpperCase()}`;

      setDynModalMode('form');
      refreshDynModalPropertyForm();
      document.getElementById('dynamic-properties-modal').style.display = 'flex';
    }

    function closeDynamicPropertiesModal() {
      document.getElementById('dynamic-properties-modal').style.display = 'none';
      dynModalState.callback = null;
    }

    function setDynModalMode(mode) {
      dynModalState.mode = mode;
      const btnForm = document.getElementById('dyn-btn-mode-form');
      const btnJson = document.getElementById('dyn-btn-mode-json');
      const formDiv = document.getElementById('dyn-form-container');
      const jsonDiv = document.getElementById('dyn-json-container');

      if (mode === 'form') {
        btnForm.style.background = 'var(--accent)';
        btnForm.style.color = '#fff';
        btnJson.style.background = 'var(--bg-surface)';
        btnJson.style.color = 'var(--text-secondary)';
        formDiv.style.display = 'block';
        jsonDiv.style.display = 'none';
        refreshDynModalPropertyForm();
      } else {
        btnJson.style.background = 'var(--accent)';
        btnJson.style.color = '#fff';
        btnForm.style.background = 'var(--bg-surface)';
        btnForm.style.color = 'var(--text-secondary)';
        formDiv.style.display = 'none';
        jsonDiv.style.display = 'flex';
        document.getElementById('dyn-raw-json').value = JSON.stringify(dynModalState.values, null, 2);
        document.getElementById('dyn-json-error').style.display = 'none';
      }
    }

    function onDynRawJsonInput() {
      const errEl = document.getElementById('dyn-json-error');
      try {
        const text = document.getElementById('dyn-raw-json').value.trim();
        const parsed = JSON.parse(text || '{}');
        if (typeof parsed !== 'object' || Array.isArray(parsed) || parsed === null) {
          throw new Error('JSON root must be an object');
        }
        dynModalState.values = parsed;
        errEl.style.display = 'none';
      } catch (err) {
        errEl.textContent = `Syntax Error: ${err.message}`;
        errEl.style.display = 'block';
      }
    }

    function refreshDynModalPropertyForm() {
      renderPropertyForm({
        containerId: 'dyn-properties-target',
        category: dynModalState.category,
        type: dynModalState.type,
        values: dynModalState.values,
        showOnlyConnectionRelated: false,
        instanceKey: 'dyn_modal',
        onChange: (v) => {
          dynModalState.values = v;
        }
      });
    }

    function applyDynamicPropertiesModal() {
      if (typeof dynModalState.callback === 'function') {
        dynModalState.callback(dynModalState.values);
      }
      showToast('Advanced properties applied', 'info');
      closeDynamicPropertiesModal();
    }

    function openSinkAdvancedProperties(sinkIdx) {
      if (!ruleDesignerState.sinks[sinkIdx]) return;
      const sink = ruleDesignerState.sinks[sinkIdx];
      const currentProps = Object.assign({}, sink.advancedProps || sink);
      openDynamicPropertiesModal('sinks', sink.type, currentProps, (updatedProps) => {
        ruleDesignerState.sinks[sinkIdx].advancedProps = updatedProps;
        // Merge known fields back
        if (updatedProps.server) sink.server = updatedProps.server;
        if (updatedProps.topic) sink.topic = updatedProps.topic;
        if (updatedProps.qos !== undefined) sink.qos = updatedProps.qos;
        if (updatedProps.url) sink.url = updatedProps.url;
        if (updatedProps.brokers) sink.brokers = updatedProps.brokers;
        updateRuleDesignerPreview();
      });
    }

    function openStreamAdvancedProperties() {
      const connType = document.getElementById('sd-connector-type').value;
      const currentOpts = Object.assign({}, streamDesignerState.advancedProps || {});
      openDynamicPropertiesModal('sources', connType, currentOpts, (updatedProps) => {
        streamDesignerState.advancedProps = updatedProps;
        updateStreamDesignerDdl();
      });
    }

    // ==========================================================================
    // SCHEMA REGISTRY & MULTI-PROTOCOL SERIALIZER HUB CONTROLLER
    // ==========================================================================
    const schemasState = {
      items: [], // Array of { name, kind, content, file, parsed, messages }
      loading: false,
      filterKind: 'all',
      searchQuery: '',
      isEditing: false,
      activeInspectSchema: null
    };

    const SCHEMA_TEMPLATES = {
      proto_sensor: `syntax = "proto3";

package rekuiper.industrial;



message SensorReading {

  string device_id = 1;

  double temperature = 2;

  double humidity = 3;

  double pressure_bar = 4;

  int64 timestamp = 5;

}



message FleetStatus {

  string site_id = 1;

  int32 active_nodes = 2;

  repeated SensorReading readings = 3;

}`,
      proto_alarm: `syntax = "proto3";

package rekuiper.diagnostics;



enum AlarmSeverity {

  INFO = 0;

  WARNING = 1;

  CRITICAL = 2;

  EMERGENCY_STOP = 3;

}



message DiagnosticAlert {

  string machine_id = 1;

  string component = 2;

  AlarmSeverity severity = 3;

  double metric_value = 4;

  double threshold_limit = 5;

  int64 event_time_ms = 6;

}`,
      proto_opcua: `syntax = "proto3";

package rekuiper.opcua;



message TagValue {

  string node_id = 1;

  string display_name = 2;

  double val_numeric = 3;

  string val_string = 4;

  uint32 status_code = 5;

  int64 source_timestamp = 6;

}`,
      custom_modbus: `{

  "codec": "modbus_rtu",

  "slave_id": 1,

  "function_code": 3,

  "start_register": 40001,

  "registers": [

    { "offset": 0, "name": "motor_current_amps", "type": "float32_be", "scale": 0.1 },

    { "offset": 2, "name": "bearing_temp_c", "type": "int16_be", "scale": 0.01 },

    { "offset": 3, "name": "vibration_rms", "type": "uint16_be", "scale": 0.001 }

  ]

}`,
      json_metric: `{

  "$schema": "http://json-schema.org/draft-07/schema#",

  "title": "IndustrialTelemetry",

  "type": "object",

  "properties": {

    "device_id": { "type": "string" },

    "temperature": { "type": "number", "minimum": -50.0, "maximum": 200.0 },

    "humidity": { "type": "number", "minimum": 0, "maximum": 100 },

    "timestamp": { "type": "integer" }

  },

  "required": ["device_id", "temperature", "timestamp"]

}`,
      delimited_csv: `{

  "format": "delimited",

  "delimiter": ",",

  "has_header": true,

  "columns": [

    { "name": "timestamp", "type": "datetime" },

    { "name": "sensor_id", "type": "string" },

    { "name": "flow_rate", "type": "float" },

    { "name": "valve_status", "type": "string" }

  ]

}`
    };

    function parseProtoDefinition(protoText) {
      if (!protoText || typeof protoText !== 'string') {
        return { valid: false, syntax: 'unknown', package: '', messages: [], enums: [], error: 'Empty definition' };
      }

      // Strip comments
      const clean = protoText.replace(/\/\/.*$/gm, '').replace(/\/\*[\s\S]*?\*\//g, '');

      // Syntax
      const syntaxMatch = clean.match(/syntax\s*=\s*["']([^"']+)["']/);
      const syntax = syntaxMatch ? syntaxMatch[1] : 'proto2';

      // Package
      const pkgMatch = clean.match(/package\s+([A-Za-z0-9_.]+)\s*;/);
      const packageName = pkgMatch ? pkgMatch[1] : '';

      // Enums
      const enums = [];
      const enumRegex = /enum\s+([A-Za-z0-9_]+)\s*\{([^}]*)\}/g;
      let enumMatch;
      while ((enumMatch = enumRegex.exec(clean)) !== null) {
        const enumName = enumMatch[1];
        const enumBody = enumMatch[2];
        const values = [];
        const valRegex = /([A-Za-z0-9_]+)\s*=\s*(\d+)\s*;/g;
        let valMatch;
        while ((valMatch = valRegex.exec(enumBody)) !== null) {
          values.push({ name: valMatch[1], tag: parseInt(valMatch[2], 10) });
        }
        enums.push({ name: enumName, values });
      }

      // Messages
      const messages = [];
      const msgRegex = /message\s+([A-Za-z0-9_]+)\s*\{([^}]*)\}/g;
      let msgMatch;
      while ((msgMatch = msgRegex.exec(clean)) !== null) {
        const msgName = msgMatch[1];
        const msgBody = msgMatch[2];
        const fields = [];
        const fieldRegex = /(?:(repeated|optional)\s+)?([A-Za-z0-9_.]+)\s+([A-Za-z0-9_]+)\s*=\s*(\d+)\s*;/g;
        let fMatch;
        while ((fMatch = fieldRegex.exec(msgBody)) !== null) {
          fields.push({
            rule: fMatch[1] || 'single',
            type: fMatch[2],
            name: fMatch[3],
            tag: parseInt(fMatch[4], 10)
          });
        }
        messages.push({ name: msgName, fields });
      }

      let error = null;
      if (messages.length === 0 && clean.trim().length > 0 && !clean.includes('message')) {
        error = 'No message blocks detected. A protobuf contract must define at least one message.';
      }

      return {
        valid: !error,
        syntax,
        package: packageName,
        messages,
        enums,
        error
      };
    }

    function getLocalExtendedSchemas() {
      try {
        const raw = localStorage.getItem('rekuiper_extended_schemas');
        return raw ? JSON.parse(raw) : [];
      } catch (_) {
        return [];
      }
    }

    function saveLocalExtendedSchemas(items) {
      try {
        localStorage.setItem('rekuiper_extended_schemas', JSON.stringify(items));
      } catch (_) {}
    }

    function upsertLocalExtendedSchema(schemaObj) {
      const list = getLocalExtendedSchemas().filter(s => !(s.name === schemaObj.name && s.kind === schemaObj.kind));
      list.push(schemaObj);
      saveLocalExtendedSchemas(list);
    }

    function removeLocalExtendedSchema(kind, name) {
      const list = getLocalExtendedSchemas().filter(s => !(s.name === name && s.kind === kind));
      saveLocalExtendedSchemas(list);
    }

    async function fetchSchemas() {
      schemasState.loading = true;
      const loaded = [];

      try {
        // Fetch Protobuf schemas from backend REST API
        const protoRes = await apiFetch('/schemas/protobuf');
        if (protoRes.ok && Array.isArray(protoRes.body)) {
          for (const name of protoRes.body) {
            try {
              const detailRes = await apiFetch(`/schemas/protobuf/${encodeURIComponent(name)}`);
              const content = detailRes.ok && detailRes.body ? (detailRes.body.content || '') : '';
              const parsed = parseProtoDefinition(content);
              loaded.push({
                name,
                kind: 'protobuf',
                content,
                file: detailRes.body?.file || null,
                parsed,
                messages: parsed.messages.map(m => m.name)
              });
            } catch (_) {}
          }
        }

        // Fetch Custom schemas from backend REST API
        const customRes = await apiFetch('/schemas/custom');
        if (customRes.ok && Array.isArray(customRes.body)) {
          for (const name of customRes.body) {
            try {
              const detailRes = await apiFetch(`/schemas/custom/${encodeURIComponent(name)}`);
              const content = detailRes.ok && detailRes.body ? (detailRes.body.content || '') : '';
              loaded.push({
                name,
                kind: 'custom',
                content,
                file: detailRes.body?.file || null,
                parsed: null,
                messages: ['CustomCodec']
              });
            } catch (_) {}
          }
        }

        // Merge JSON / Delimited schemas from local storage
        const localItems = getLocalExtendedSchemas();
        for (const item of localItems) {
          if (!loaded.some(it => it.name === item.name && it.kind === item.kind)) {
            loaded.push(item);
          }
        }
      } catch (err) {
        console.error('fetchSchemas error:', err);
      } finally {
        schemasState.items = loaded;
        schemasState.loading = false;
        renderSchemasTable();
        populateAllSchemaPickers();
      }
    }

    function getSchemaReferences(schemaName) {
      const refs = { streams: [], tables: [], rules: [] };
      if (!schemaName) return refs;
      const target = String(schemaName).toLowerCase();

      // Scan streams
      (state.streams || []).forEach(s => {
        const name = typeof s === 'string' ? s : (s.name || s.id || '');
        const str = (s.sql || (typeof s === 'object' ? JSON.stringify(s) : '')).toLowerCase();
        if (str.includes(target)) refs.streams.push(name);
      });

      // Scan tables
      (state.tables || []).forEach(t => {
        const name = typeof t === 'string' ? t : (t.name || t.id || '');
        const str = (t.sql || (typeof t === 'object' ? JSON.stringify(t) : '')).toLowerCase();
        if (str.includes(target)) refs.tables.push(name);
      });

      // Scan rules
      (state.rules || []).forEach(r => {
        const ruleId = typeof r === 'string' ? r : (r.id || '');
        const str = (JSON.stringify(r) + ' ' + JSON.stringify(state.ruleMetrics?.[ruleId] || {})).toLowerCase();
        if (str.includes(target)) refs.rules.push(ruleId);
      });

      return refs;
    }

    function renderSchemasTable() {
      const tbody = document.getElementById('schemas-tbody');
      if (!tbody) return;

      const countBadge = document.getElementById('catalog-schemas-count');
      if (countBadge) countBadge.textContent = schemasState.items.length;

      const search = (document.getElementById('catalog-schemas-search')?.value || '').toLowerCase().trim();
      const filter = document.getElementById('catalog-schemas-filter')?.value || 'all';

      const filtered = schemasState.items.filter(s => {
        if (filter !== 'all' && s.kind !== filter) return false;
        if (search) {
          const hay = (s.name + ' ' + s.kind + ' ' + (s.messages || []).join(' ')).toLowerCase();
          if (!hay.includes(search)) return false;
        }
        return true;
      });

      if (filtered.length === 0) {
        tbody.innerHTML = `<tr><td colspan="5" class="empty-state">${schemasState.items.length === 0 ? 'No schemas registered yet. Click "+ New Schema 📜" to define a contract.' : 'No schemas match current filter.'}</td></tr>`;
        return;
      }

      tbody.innerHTML = filtered.map(s => {
        const refs = getSchemaReferences(s.name);
        const refCount = refs.streams.length + refs.tables.length + refs.rules.length;
        const refTooltip = refCount > 0
          ? `Streams: ${refs.streams.join(', ') || 'None'}; Rules: ${refs.rules.join(', ') || 'None'}`
          : 'No active streams or rules depend on this schema';

        let kindBadgeStyle = 'background:#8b5cf6; color:#fff;';
        let kindLabel = 'PROTOBUF 3';
        if (s.kind === 'custom') {
          kindBadgeStyle = 'background:#06b6d4; color:#fff;';
          kindLabel = 'CUSTOM CODEC';
        } else if (s.kind === 'json') {
          kindBadgeStyle = 'background:#f59e0b; color:#fff;';
          kindLabel = 'JSON SCHEMA';
        } else if (s.kind === 'delimited') {
          kindBadgeStyle = 'background:#10b981; color:#fff;';
          kindLabel = 'DELIMITED';
        }

        const msgsList = Array.isArray(s.messages) && s.messages.length > 0
          ? s.messages.map(m => `<span class="badge badge-slate" style="font-size:10px; font-family:var(--font-mono);">${escapeHtml(m)}</span>`).join(' ')
          : '<span style="color:var(--text-muted); font-size:11px;">(raw definition)</span>';

        return `

          <tr>

            <td>

              <div style="display:flex; align-items:center; gap:8px;">

                <span style="font-size:15px;">📜</span>

                <strong style="font-family:var(--font-mono); font-size:13px; color:var(--text-primary);">${escapeHtml(s.name)}</strong>

              </div>

            </td>

            <td>

              <span class="badge" style="${kindBadgeStyle} font-size:10px; font-weight:700; text-transform:uppercase;">${kindLabel}</span>

            </td>

            <td>

              <div style="display:flex; flex-wrap:wrap; gap:4px; max-width:260px;">${msgsList}</div>

            </td>

            <td>

              ${refCount > 0
                ? `<span class="badge badge-emerald" title="${escapeHtml(refTooltip)}">✓ ${refCount} Active Ref${refCount > 1 ? 's' : ''}</span>`
                : `<span class="badge badge-slate" title="${escapeHtml(refTooltip)}">0 Unused</span>`
              }

            </td>

            <td style="text-align: right;">

              <div style="display: inline-flex; gap: 6px;">

                <button class="btn btn-sm" onclick="openSchemaInspectorModal('${escapeHtml(s.kind)}', '${escapeHtml(s.name)}')" title="Inspect Full Contract 🔍">Inspect 🔍</button>

                <button class="btn btn-sm" onclick="openEditSchemaModal('${escapeHtml(s.kind)}', '${escapeHtml(s.name)}')" title="Edit Schema ✏">Edit ✏</button>

                <button class="btn btn-sm" style="color:var(--rose-text);" onclick="deleteSchemaWithRefGuard('${escapeHtml(s.kind)}', '${escapeHtml(s.name)}')" title="Drop Schema 🗑">Delete 🗑</button>

              </div>

            </td>

          </tr>

        `;
      }).join('');
    }

    function populateStreamSchemaSelect(format) {
      const select = document.getElementById('sd-schema-select');
      if (!select) return;
      select.innerHTML = '<option value="">-- Select Schema --</option>';

      const targetKind = format === 'protobuf' ? 'protobuf' : (format === 'custom' ? 'custom' : null);
      if (!targetKind) return;

      const candidates = schemasState.items.filter(s => s.kind === targetKind);
      candidates.forEach(s => {
        const opt = document.createElement('option');
        opt.value = s.name;
        opt.textContent = `${s.name} (${s.messages && s.messages.length ? s.messages.join(', ') : s.kind})`;
        select.appendChild(opt);
      });
    }

    function getSchemaOptionsHtml(kind, selectedVal) {
      const candidates = schemasState.items.filter(s => s.kind === kind);
      return candidates.map(s => {
        const sel = s.name === selectedVal ? 'selected' : '';
        return `<option value="${escapeHtml(s.name)}" ${sel}>${escapeHtml(s.name)}</option>`;
      }).join('');
    }

    function getSchemaMessageOptionsHtml(schemaName, selectedVal) {
      if (!schemaName) return '<option value="">(Select schema first)</option>';
      const found = schemasState.items.find(s => s.name === schemaName);
      if (!found || !Array.isArray(found.messages) || found.messages.length === 0) {
        return '<option value="">(No messages found)</option>';
      }
      return found.messages.map(m => {
        const sel = m === selectedVal ? 'selected' : '';
        return `<option value="${escapeHtml(m)}" ${sel}>${escapeHtml(m)}</option>`;
      }).join('');
    }

    function onSinkSchemaSelectChange(idx) {
      renderDesignerSinks();
      updateRuleDesignerPreview();
    }

    function populateAllSchemaPickers() {
      const curFmt = document.getElementById('sd-format')?.value;
      if (curFmt === 'protobuf' || curFmt === 'custom') {
        const curVal = document.getElementById('sd-schema-select')?.value;
        populateStreamSchemaSelect(curFmt);
        if (curVal) {
          const sSel = document.getElementById('sd-schema-select');
          if (sSel) sSel.value = curVal;
        }
      }
    }

    function openNewSchemaModal() {
      schemasState.isEditing = false;
      document.getElementById('schema-modal-title').textContent = 'Register New Schema Definition';
      document.getElementById('schema-modal-name').value = '';
      document.getElementById('schema-modal-name').readOnly = false;
      document.getElementById('schema-modal-kind').value = 'protobuf';
      document.getElementById('schema-template-select').value = 'proto_sensor';
      document.getElementById('schema-modal-content').value = SCHEMA_TEMPLATES.proto_sensor;
      document.getElementById('schema-modal-footer-msg').textContent = 'Single-binary zero-dependency serialization hub';

      onSchemaContentInput();
      document.getElementById('schema-editor-modal').style.display = 'flex';
    }

    function openEditSchemaModal(kind, name) {
      const found = schemasState.items.find(s => s.name === name && s.kind === kind);
      if (!found) {
        showToast(`Schema '${name}' not found`, 'warning');
        return;
      }
      schemasState.isEditing = true;
      document.getElementById('schema-modal-title').textContent = `Edit Schema: ${name}`;
      document.getElementById('schema-modal-name').value = name;
      document.getElementById('schema-modal-name').readOnly = true;
      document.getElementById('schema-modal-kind').value = kind;
      document.getElementById('schema-template-select').value = '';
      document.getElementById('schema-modal-content').value = found.content || '';
      document.getElementById('schema-modal-footer-msg').textContent = `Editing registered ${kind} schema`;

      onSchemaContentInput();
      document.getElementById('schema-editor-modal').style.display = 'flex';
    }

    function closeSchemaModal() {
      document.getElementById('schema-editor-modal').style.display = 'none';
    }

    function onSchemaModalKindChange() {
      const kind = document.getElementById('schema-modal-kind').value;
      const editorLabel = document.getElementById('schema-editor-label');
      if (kind === 'protobuf') {
        editorLabel.textContent = 'Protobuf 3 Definition (.proto)';
        loadSchemaTemplate('proto_sensor');
      } else if (kind === 'custom') {
        editorLabel.textContent = 'Custom Codec Descriptor (JSON / Config)';
        loadSchemaTemplate('custom_modbus');
      } else if (kind === 'json') {
        editorLabel.textContent = 'JSON Schema Specification (Draft-07)';
        loadSchemaTemplate('json_metric');
      } else if (kind === 'delimited') {
        editorLabel.textContent = 'Delimited / CSV Field Specification';
        loadSchemaTemplate('delimited_csv');
      }
    }

    function loadSchemaTemplate(tplKey) {
      if (!tplKey || !SCHEMA_TEMPLATES[tplKey]) return;
      document.getElementById('schema-modal-content').value = SCHEMA_TEMPLATES[tplKey];
      onSchemaContentInput();
    }

    function formatSchemaContent() {
      const kind = document.getElementById('schema-modal-kind').value;
      const content = document.getElementById('schema-modal-content').value;
      if (kind === 'json' || kind === 'custom' || kind === 'delimited') {
        try {
          const parsed = JSON.parse(content);
          document.getElementById('schema-modal-content').value = JSON.stringify(parsed, null, 2);
          showToast('JSON formatted', 'info');
        } catch (_) {
          showToast('Cannot format: invalid JSON', 'warning');
        }
      } else {
        // proto cleanup: trim trailing spaces
        const formatted = content.split('\n').map(l => l.trimEnd()).join('\n');
        document.getElementById('schema-modal-content').value = formatted;
        showToast('Protobuf definition cleaned', 'info');
      }
    }

    function handleSchemaFileUpload(event) {
      const file = event.target.files?.[0];
      if (!file) return;
      const reader = new FileReader();
      reader.onload = (e) => {
        const text = e.target.result;
        document.getElementById('schema-modal-content').value = text;
        const nameInput = document.getElementById('schema-modal-name');
        if (!nameInput.value) {
          nameInput.value = file.name.replace(/\.[^/.]+$/, '').toLowerCase().replace(/[^a-z0-9_]/g, '_');
        }
        if (file.name.endsWith('.proto')) {
          document.getElementById('schema-modal-kind').value = 'protobuf';
        } else if (file.name.endsWith('.json')) {
          document.getElementById('schema-modal-kind').value = 'json';
        }
        onSchemaContentInput();
        showToast(`Loaded file '${file.name}'`, 'info');
      };
      reader.readAsText(file);
    }

    function onSchemaContentInput() {
      const kind = document.getElementById('schema-modal-kind').value;
      const content = document.getElementById('schema-modal-content').value;

      if (kind === 'protobuf') {
        const res = parseProtoDefinition(content);
        document.getElementById('schema-ast-syntax').textContent = res.syntax || 'proto3';
        document.getElementById('schema-ast-package').textContent = res.package || '(none)';
        document.getElementById('schema-ast-msg-count').textContent = res.messages.length;
        document.getElementById('schema-ast-enum-count').textContent = res.enums.length;

        const msgBox = document.getElementById('schema-ast-messages-container');
        if (res.messages.length === 0) {
          msgBox.innerHTML = '<div style="font-size:11px; color:var(--text-muted);">No messages detected.</div>';
        } else {
          msgBox.innerHTML = res.messages.map(m => `

            <div style="background:var(--bg-subtle); padding:6px 10px; border-radius:6px; border:1px solid var(--border);">

              <div style="font-weight:700; font-size:12px; font-family:var(--font-mono); color:var(--text-primary); margin-bottom:4px;">

                message ${escapeHtml(m.name)}

              </div>

              <div style="font-size:11px; color:var(--text-secondary); font-family:var(--font-mono);">

                ${m.fields.map(f => `${escapeHtml(f.type)} ${escapeHtml(f.name)} = ${f.tag};`).join('<br/>')}

              </div>

            </div>

          `).join('');
        }

        const enumBox = document.getElementById('schema-ast-enums-container');
        if (res.enums.length === 0) {
          enumBox.innerHTML = '<div style="font-size:11px; color:var(--text-muted);">No enums defined.</div>';
        } else {
          enumBox.innerHTML = res.enums.map(e => `

            <span class="badge badge-slate" style="font-family:var(--font-mono); font-size:11px;">enum ${escapeHtml(e.name)}</span>

          `).join(' ');
        }

        const statusBox = document.getElementById('schema-ast-status-box');
        const statusText = document.getElementById('schema-ast-status-text');
        if (res.valid) {
          statusBox.style.background = 'rgba(16, 185, 129, 0.1)';
          statusBox.style.borderColor = '#10b981';
          statusText.style.color = '#10b981';
          statusText.textContent = `🟢 Valid ${res.syntax} • ${res.messages.length} Message${res.messages.length !== 1 ? 's' : ''} extracted`;
        } else {
          statusBox.style.background = 'rgba(239, 68, 68, 0.1)';
          statusBox.style.borderColor = '#ef4444';
          statusText.style.color = '#ef4444';
          statusText.textContent = `🔴 Syntax Warning: ${res.error}`;
        }
      } else {
        // Non-protobuf: JSON check
        document.getElementById('schema-ast-syntax').textContent = kind.toUpperCase();
        document.getElementById('schema-ast-package').textContent = 'n/a';
        const msgBox = document.getElementById('schema-ast-messages-container');
        const enumBox = document.getElementById('schema-ast-enums-container');
        const statusBox = document.getElementById('schema-ast-status-box');
        const statusText = document.getElementById('schema-ast-status-text');

        try {
          const parsed = JSON.parse(content);
          const topKeys = Object.keys(parsed);
          document.getElementById('schema-ast-msg-count').textContent = topKeys.length;
          document.getElementById('schema-ast-enum-count').textContent = 0;
          msgBox.innerHTML = `<div style="font-size:11px; font-family:var(--font-mono); color:var(--text-secondary);">Top keys: ${topKeys.join(', ')}</div>`;
          enumBox.innerHTML = '<div style="font-size:11px; color:var(--text-muted);">(JSON object)</div>';
          statusBox.style.background = 'rgba(16, 185, 129, 0.1)';
          statusBox.style.borderColor = '#10b981';
          statusText.style.color = '#10b981';
          statusText.textContent = '🟢 Valid JSON document';
        } catch (e) {
          document.getElementById('schema-ast-msg-count').textContent = 0;
          document.getElementById('schema-ast-enum-count').textContent = 0;
          statusBox.style.background = 'rgba(239, 68, 68, 0.1)';
          statusBox.style.borderColor = '#ef4444';
          statusText.style.color = '#ef4444';
          statusText.textContent = `🔴 Invalid JSON: ${e.message}`;
        }
      }
    }

    function validateSchemaModalSyntax() {
      onSchemaContentInput();
      const statusText = document.getElementById('schema-ast-status-text')?.textContent || '';
      showToast(statusText, statusText.includes('Valid') ? 'success' : 'warning');
    }

    async function submitSchemaModal() {
      const name = document.getElementById('schema-modal-name').value.trim();
      const kind = document.getElementById('schema-modal-kind').value;
      const content = document.getElementById('schema-modal-content').value;

      if (!name) {
        showToast('Schema Name / ID is required', 'warning');
        return;
      }
      if (!/^[a-zA-Z0-9_-]+$/.test(name)) {
        showToast('Schema Name may only contain alphanumeric characters, hyphens, and underscores', 'warning');
        return;
      }
      if (!content.trim()) {
        showToast('Schema content cannot be empty', 'warning');
        return;
      }

      if (kind === 'protobuf') {
        const check = parseProtoDefinition(content);
        if (!check.valid) {
          if (!confirm(`Warning: Protobuf syntax check flagged: "${check.error}". Do you want to register it anyway?`)) {
            return;
          }
        }
      }

      try {
        if (kind === 'protobuf' || kind === 'custom') {
          // Send to backend REST API
          const method = schemasState.isEditing ? 'PUT' : 'POST';
          const url = schemasState.isEditing
            ? `/schemas/${kind}/${encodeURIComponent(name)}`
            : `/schemas/${kind}`;
          const bodyPayload = schemasState.isEditing
            ? { content }
            : { name, content };

          const res = await apiFetch(url, {
            method,
            body: bodyPayload
          });

          if (res.ok) {
            showToast(`Schema '${name}' (${kind}) saved successfully!`, 'success');
            closeSchemaModal();
            await fetchSchemas();
          } else {
            // If create returned already registered, fall back to update
            if (!schemasState.isEditing && res.status === 400 && String(res.body?.message || '').includes('already registered')) {
              const putRes = await apiFetch(`/schemas/${kind}/${encodeURIComponent(name)}`, {
                method: 'PUT',
                body: { content }
              });
              if (putRes.ok) {
                showToast(`Schema '${name}' updated successfully!`, 'success');
                closeSchemaModal();
                await fetchSchemas();
                return;
              }
            }
            const msg = res.body?.message || `Failed to save schema (${res.status})`;
            showToast(`Error: ${msg}`, 'error');
          }
        } else {
          // JSON or Delimited schema: persist via extended storage
          const parsedProto = null;
          upsertLocalExtendedSchema({
            name,
            kind,
            content,
            file: null,
            parsed: parsedProto,
            messages: [kind.toUpperCase()]
          });
          showToast(`Schema '${name}' (${kind}) registered locally!`, 'success');
          closeSchemaModal();
          await fetchSchemas();
        }
      } catch (err) {
        showToast(`Save error: ${err.message}`, 'error');
      }
    }

    async function deleteSchemaWithRefGuard(kind, name) {
      const refs = getSchemaReferences(name);
      const totalRefs = refs.streams.length + refs.tables.length + refs.rules.length;
      if (totalRefs > 0) {
        const streamList = refs.streams.length ? `Streams: ${refs.streams.join(', ')}` : '';
        const ruleList = refs.rules.length ? `Rules: ${refs.rules.join(', ')}` : '';
        const details = [streamList, ruleList].filter(Boolean).join('; ');
        if (!confirm(`Warning: Schema '${name}' is actively referenced by: ${details}.\n\nDropping it may cause running pipelines to fail deserialization. Are you sure you want to proceed?`)) {
          return;
        }
      } else {
        if (!confirm(`Are you sure you want to drop schema '${name}' (${kind})? This cannot be undone.`)) {
          return;
        }
      }

      try {
        if (kind === 'protobuf' || kind === 'custom') {
          const res = await apiFetch(`/schemas/${kind}/${encodeURIComponent(name)}`, { method: 'DELETE' });
          if (res.ok) {
            showToast(`Schema '${name}' dropped`, 'info');
          } else {
            showToast(`Failed to drop schema (${res.status})`, 'error');
          }
        } else {
          removeLocalExtendedSchema(kind, name);
          showToast(`Schema '${name}' dropped`, 'info');
        }
        await fetchSchemas();
      } catch (err) {
        showToast(`Delete error: ${err.message}`, 'error');
      }
    }

    function openSchemaInspectorModal(kind, name) {
      const found = schemasState.items.find(s => s.name === name && s.kind === kind);
      if (!found) {
        showToast(`Schema '${name}' not found`, 'warning');
        return;
      }
      schemasState.activeInspectSchema = found;

      document.getElementById('schema-inspect-title').textContent = `Schema Inspector: ${name}`;
      document.getElementById('schema-inspect-subtitle').textContent = `Protocol: ${kind.toUpperCase()} • Length: ${(found.content || '').length} characters`;

      const kindBadge = document.getElementById('schema-inspect-kind-badge');
      kindBadge.textContent = kind.toUpperCase();
      kindBadge.className = 'badge ' + (kind === 'protobuf' ? 'badge-indigo' : (kind === 'custom' ? 'badge-cyan' : 'badge-amber'));

      const refs = getSchemaReferences(name);
      const totalRefs = refs.streams.length + refs.tables.length + refs.rules.length;
      const refBadge = document.getElementById('schema-inspect-ref-badge');
      if (totalRefs > 0) {
        refBadge.textContent = `✓ ${totalRefs} Active Pipeline Reference${totalRefs > 1 ? 's' : ''}`;
        refBadge.className = 'badge badge-emerald';
        refBadge.title = `Streams: ${refs.streams.join(', ') || 'None'}; Rules: ${refs.rules.join(', ') || 'None'}`;
      } else {
        refBadge.textContent = '0 Pipeline References (Unused)';
        refBadge.className = 'badge badge-slate';
        refBadge.title = 'No active streams or rules reference this schema';
      }

      const typesList = document.getElementById('schema-inspect-types-list');
      if (Array.isArray(found.messages) && found.messages.length > 0) {
        typesList.innerHTML = found.messages.map(m => `<span class="badge badge-slate" style="font-family:var(--font-mono); font-size:12px; font-weight:600;">${escapeHtml(m)}</span>`).join(' ');
      } else {
        typesList.innerHTML = '<span style="font-size:11px; color:var(--text-muted);">(no extracted messages)</span>';
      }

      document.getElementById('schema-inspect-code').textContent = found.content || '(empty)';
      document.getElementById('schema-inspector-modal').style.display = 'flex';
    }

    function closeSchemaInspectorModal() {
      document.getElementById('schema-inspector-modal').style.display = 'none';
    }

    function copySchemaInspectContent() {
      const content = schemasState.activeInspectSchema?.content || '';
      navigator.clipboard.writeText(content).then(() => {
        showToast('Schema content copied to clipboard', 'info');
      }).catch(err => {
        showToast(`Copy failed: ${err.message}`, 'error');
      });
    }

    function editFromSchemaInspector() {
      const s = schemasState.activeInspectSchema;
      if (!s) return;
      closeSchemaInspectorModal();
      openEditSchemaModal(s.kind, s.name);
    }

    // =========================================================================
    // Phase 4: Extensions, UDFs & Services Center Controller
    // =========================================================================

    const pluginsState = {
      subTab: 'plugins',
      plugins: [],
      jsUdfs: [],
      services: [],
      serviceFunctions: [],
      allFunctions: [],
      uploads: [],
      activeInspectPlugin: null,
      activeEditJsUdfId: null,
      uploadFileData: null,
      uploadFileName: '',
      importFileContent: null,
      importFileName: ''
    };

    function switchExtSubTab(subTab) {
      pluginsState.subTab = subTab;
      ['plugins', 'udfs', 'services', 'uploads', 'backup'].forEach(t => {
        const btn = document.getElementById(`ext-subtab-btn-${t}`);
        const panel = document.getElementById(`ext-panel-${t}`);
        if (btn) btn.classList.toggle('active', t === subTab);
        if (panel) panel.style.display = (t === subTab) ? 'flex' : 'none';
      });
      if (subTab === 'plugins') renderPluginsTable();
      if (subTab === 'udfs') { renderJsUdfsTable(); renderSqlFunctionsPalette(); }
      if (subTab === 'services') renderServicesTable();
      if (subTab === 'uploads') renderUploadsTable();
    }

    async function fetchPluginsHubData() {
      try {
        const [
          sourcesRes, sinksRes, funcsRes, wasmRes,
          udfsRes, servicesRes, svcFuncsRes,
          uploadsRes, metaFuncsRes
        ] = await Promise.allSettled([
          apiFetch('/plugins/sources'),
          apiFetch('/plugins/sinks'),
          apiFetch('/plugins/functions'),
          apiFetch('/plugins/wasm'),
          apiFetch('/udf/javascript'),
          apiFetch('/services'),
          apiFetch('/services/functions'),
          apiFetch('/config/uploads'),
          apiFetch('/metadata/functions')
        ]);

        // Aggregate plugins
        const combined = [];
        if (sourcesRes.status === 'fulfilled' && Array.isArray(sourcesRes.value.body)) {
          sourcesRes.value.body.forEach(p => combined.push({ name: typeof p === 'string' ? p : (p.name || p.id), type: 'source', kind: 'Source Connector' }));
        }
        if (sinksRes.status === 'fulfilled' && Array.isArray(sinksRes.value.body)) {
          sinksRes.value.body.forEach(p => combined.push({ name: typeof p === 'string' ? p : (p.name || p.id), type: 'sink', kind: 'Sink Connector' }));
        }
        if (funcsRes.status === 'fulfilled' && Array.isArray(funcsRes.value.body)) {
          funcsRes.value.body.forEach(p => combined.push({ name: typeof p === 'string' ? p : (p.name || p.id), type: 'function', kind: 'Function Plugin' }));
        }
        if (wasmRes.status === 'fulfilled' && Array.isArray(wasmRes.value.body)) {
          wasmRes.value.body.forEach(p => combined.push({ name: typeof p === 'string' ? p : (p.name || p.id), type: 'wasm', kind: 'WebAssembly (Wasm)' }));
        }
        pluginsState.plugins = combined;
        document.getElementById('ext-count-plugins').textContent = combined.length;
        document.getElementById('plugins-table-count').textContent = combined.length;

        // JavaScript UDFs
        if (udfsRes.status === 'fulfilled' && Array.isArray(udfsRes.value.body)) {
          const udfIds = udfsRes.value.body;
          const details = await Promise.all(udfIds.map(id => apiFetch(`/udf/javascript/${encodeURIComponent(id)}`).then(r => r.ok ? r.body : { id })));
          pluginsState.jsUdfs = details;
        } else {
          pluginsState.jsUdfs = [];
        }
        document.getElementById('ext-count-udfs').textContent = pluginsState.jsUdfs.length;
        document.getElementById('udfs-table-count').textContent = pluginsState.jsUdfs.length;

        // SQL metadata functions
        if (metaFuncsRes.status === 'fulfilled' && Array.isArray(metaFuncsRes.value.body)) {
          pluginsState.allFunctions = metaFuncsRes.value.body;
          document.getElementById('sql-funcs-count').textContent = metaFuncsRes.value.body.length;
        }

        // Services
        if (servicesRes.status === 'fulfilled' && Array.isArray(servicesRes.value.body)) {
          const svcs = servicesRes.value.body;
          const details = await Promise.all(svcs.map(name => apiFetch(`/services/${encodeURIComponent(name)}`).then(r => r.ok ? Object.assign({ name }, r.body) : { name })));
          pluginsState.services = details;
        } else {
          pluginsState.services = [];
        }
        document.getElementById('ext-count-services').textContent = pluginsState.services.length;
        document.getElementById('services-table-count').textContent = pluginsState.services.length;

        // Service Functions
        if (svcFuncsRes.status === 'fulfilled' && Array.isArray(svcFuncsRes.value.body)) {
          pluginsState.serviceFunctions = svcFuncsRes.value.body;
        } else {
          pluginsState.serviceFunctions = [];
        }
        document.getElementById('service-funcs-count').textContent = pluginsState.serviceFunctions.length;

        // Uploads
        if (uploadsRes.status === 'fulfilled' && Array.isArray(uploadsRes.value.body)) {
          pluginsState.uploads = uploadsRes.value.body;
        } else {
          pluginsState.uploads = [];
        }
        document.getElementById('ext-count-uploads').textContent = pluginsState.uploads.length;
        document.getElementById('uploads-table-count').textContent = pluginsState.uploads.length;

        // Render active panel
        switchExtSubTab(pluginsState.subTab);
      } catch (err) {
        console.error('Failed to fetch extensions hub data:', err);
      }
    }

    // --- Plugins Panel Logic ---
    function renderPluginsTable() {
      const tbody = document.getElementById('plugins-tbody');
      const search = (document.getElementById('plugins-search-input').value || '').toLowerCase().trim();
      const typeFilter = document.getElementById('plugins-type-filter').value;

      const filtered = pluginsState.plugins.filter(p => {
        if (typeFilter !== 'all' && p.type !== typeFilter) return false;
        if (search && !p.name.toLowerCase().includes(search) && !p.kind.toLowerCase().includes(search)) return false;
        return true;
      });

      document.getElementById('plugins-table-count').textContent = filtered.length;

      if (filtered.length === 0) {
        tbody.innerHTML = `

          <tr>

            <td colspan="5" class="empty-state">

              <div style="font-size: 13px; font-weight: 600; margin-bottom: 4px;">No plugins installed</div>

              <div style="font-size: 11px; color: var(--text-muted); margin-bottom: 12px;">Extend rekuiper with native shared libraries (.so), WebAssembly (.wasm) modules, or portable gRPC connectors.</div>

              <button class="btn btn-sm btn-primary" onclick="openPluginInstallModal()">+ Register First Plugin 🔌</button>

            </td>

          </tr>`;
        return;
      }

      tbody.innerHTML = filtered.map(p => {
        let badgeClass = 'badge-slate';
        let icon = '🔌';
        if (p.type === 'wasm') { badgeClass = 'badge-cyan'; icon = '🦀'; }
        else if (p.type === 'source') { badgeClass = 'badge-emerald'; icon = '📥'; }
        else if (p.type === 'sink') { badgeClass = 'badge-indigo'; icon = '📤'; }
        else if (p.type === 'function') { badgeClass = 'badge-purple'; icon = '⚡'; }

        return `

          <tr>

            <td>

              <div style="display: flex; align-items: center; gap: 8px;">

                <span style="font-size: 16px;">${icon}</span>

                <span style="font-family: var(--font-mono); font-weight: 600; font-size: 13px;">${escapeHtml(p.name)}</span>

              </div>

            </td>

            <td><span class="badge ${badgeClass}">${escapeHtml(p.kind)}</span></td>

            <td><span style="font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary);">${p.type === 'wasm' ? 'Wasm Bytecode' : 'Dynamic Library (.so)'}</span></td>

            <td><span class="badge badge-emerald">Active / Loaded</span></td>

            <td style="text-align: right;">

              <div style="display: inline-flex; gap: 6px;">

                <button class="btn btn-sm" onclick="openPluginInspectModal('${escapeHtml(p.name)}', '${p.type}')">Inspect 🔍</button>

                <button class="btn btn-sm" style="color: var(--rose-text);" onclick="deletePlugin('${p.type}', '${escapeHtml(p.name)}')">Uninstall 🗑</button>

              </div>

            </td>

          </tr>`;
      }).join('');
    }

    function openPluginInstallModal() {
      document.getElementById('plugin-modal-name').value = '';
      document.getElementById('plugin-modal-file').value = '';
      document.getElementById('plugin-modal-symbols').value = '';
      document.getElementById('plugin-install-modal').style.display = 'flex';
    }

    function closePluginInstallModal() {
      document.getElementById('plugin-install-modal').style.display = 'none';
    }

    async function submitPluginInstall() {
      const type = document.getElementById('plugin-modal-type').value;
      const name = document.getElementById('plugin-modal-name').value.trim();
      const file = document.getElementById('plugin-modal-file').value.trim();
      const symbols = document.getElementById('plugin-modal-symbols').value.trim();

      if (!name) {
        showToast('Please specify a plugin name', 'warning');
        return;
      }
      if (!file) {
        showToast('Please specify a file path or URL', 'warning');
        return;
      }

      const payload = { name, file };
      if (symbols) {
        payload.functions = symbols.split(',').map(s => s.trim()).filter(Boolean);
      }

      const endpoint = type === 'wasm' ? '/plugins/wasm' : `/plugins/${type}s`;
      const res = await apiFetch(endpoint, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: payload
      });

      if (res.ok) {
        showToast(`Plugin '${name}' registered successfully`, 'success');
        closePluginInstallModal();
        await fetchPluginsHubData();
      } else {
        const msg = typeof res.body === 'string' ? res.body : (res.body?.message || `Failed to register plugin (${res.status})`);
        showToast(msg, 'error');
      }
    }

    async function deletePlugin(type, name) {
      if (!confirm(`Are you sure you want to uninstall plugin '${name}'?`)) return;
      const endpoint = type === 'wasm' ? `/plugins/wasm/${encodeURIComponent(name)}` : `/plugins/${type}s/${encodeURIComponent(name)}`;
      const res = await apiFetch(endpoint, { method: 'DELETE' });
      if (res.ok) {
        showToast(`Plugin '${name}' uninstalled`, 'info');
        await fetchPluginsHubData();
      } else {
        showToast(`Uninstall failed (${res.status})`, 'error');
      }
    }

    function openPluginInspectModal(name, type) {
      document.getElementById('plugin-inspect-title').textContent = `Plugin: ${name}`;
      document.getElementById('plugin-inspect-subtitle').textContent = `Type: ${type.toUpperCase()}`;
      document.getElementById('plugin-inspect-type-badge').textContent = type.toUpperCase();
      document.getElementById('plugin-inspect-symbols-list').innerHTML = `<span class="badge badge-slate">${escapeHtml(name)}</span>`;
      document.getElementById('plugin-inspect-raw').textContent = JSON.stringify({ name, type, status: 'Loaded in Memory', engine: 'Native Rust Host' }, null, 2);
      document.getElementById('plugin-inspect-modal').style.display = 'flex';
    }

    function closePluginInspectModal() {
      document.getElementById('plugin-inspect-modal').style.display = 'none';
    }

    // --- JavaScript UDFs Panel Logic ---
    function renderJsUdfsTable() {
      const tbody = document.getElementById('udfs-tbody');
      const list = pluginsState.jsUdfs;

      if (!list || list.length === 0) {
        tbody.innerHTML = `

          <tr>

            <td colspan="4" class="empty-state">

              <div style="font-size: 13px; font-weight: 600; margin-bottom: 4px;">No JavaScript functions created yet</div>

              <div style="font-size: 11px; color: var(--text-muted); margin-bottom: 12px;">Author custom row-by-row or window aggregate functions directly in JavaScript with live preflight testing.</div>

              <button class="btn btn-sm btn-primary" onclick="openJsUdfModal()">+ Create First JS Function ⚡</button>

            </td>

          </tr>`;
        return;
      }

      tbody.innerHTML = list.map(u => `

        <tr>

          <td>

            <span style="font-family: var(--font-mono); font-weight: 600; font-size: 13px; color: #8b5cf6;">${escapeHtml(u.id)}</span>

          </td>

          <td>

            <span class="badge ${u.is_agg ? 'badge-amber' : 'badge-emerald'}">${u.is_agg ? 'Aggregate UDAF' : 'Scalar UDF'}</span>

          </td>

          <td style="font-size: 12px; color: var(--text-secondary);">${escapeHtml(u.description || '(no description)')}</td>

          <td style="text-align: right;">

            <div style="display: inline-flex; gap: 6px;">

              <button class="btn btn-sm" onclick="openJsUdfModal('${escapeHtml(u.id)}')">Edit &amp; Sandbox ✏</button>

              <button class="btn btn-sm" style="color: var(--rose-text);" onclick="deleteJsUdf('${escapeHtml(u.id)}')">Delete 🗑</button>

            </div>

          </td>

        </tr>`).join('');
    }

    function renderSqlFunctionsPalette() {
      const grid = document.getElementById('sql-funcs-grid');
      const search = (document.getElementById('sql-funcs-search').value || '').toLowerCase().trim();
      const cat = document.getElementById('sql-funcs-category').value;

      const filtered = pluginsState.allFunctions.filter(f => {
        if (cat !== 'all' && (f.category || '').toLowerCase() !== cat) return false;
        if (search && !f.name.toLowerCase().includes(search) && !(f.description || '').toLowerCase().includes(search)) return false;
        return true;
      });

      if (filtered.length === 0) {
        grid.innerHTML = '<div style="font-size: 12px; color: var(--text-muted); padding: 12px;">No matching functions found.</div>';
        return;
      }

      grid.innerHTML = filtered.map(f => {
        const example = f.example || `${f.name}()`;
        return `

          <div class="func-card">

            <div style="display: flex; align-items: center; justify-content: space-between;">

              <span class="func-card-sig">${escapeHtml(f.name)}(${escapeHtml(f.arity ? (f.arity === '1' ? 'arg' : `${f.arity} args`) : '...')})</span>

              <span class="badge badge-slate" style="font-size: 10px; text-transform: uppercase;">${escapeHtml(f.category || 'math')}</span>

            </div>

            <div style="font-size: 11px; color: var(--text-secondary); line-height: 1.3;">${escapeHtml(f.description || '')}</div>

            <div style="display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: 4px; border-top: 1px dashed var(--border);">

              <code style="font-size: 10px; color: var(--text-muted);">${escapeHtml(example)}</code>

              <button type="button" class="btn btn-xs" onclick="copySqlExpression('${escapeHtml(example)}')" title="Copy example snippet">Copy 📋</button>

            </div>

          </div>`;
      }).join('');
    }

    function copySqlExpression(expr) {
      navigator.clipboard.writeText(expr).then(() => {
        showToast(`Copied '${expr}' to clipboard`, 'info');
      }).catch(e => {
        showToast(`Copy failed: ${e.message}`, 'error');
      });
    }

    const JS_TEMPLATES = {
      scalar_temp: {
        id: 'celsius_to_fahrenheit',
        desc: 'Converts temperature from Celsius to Fahrenheit',
        agg: 'false',
        code: `// Scalar function taking 1 argument (temperature in Celsius)\nfunction celsius_to_fahrenheit(c) {\n  if (c === null || c === undefined) return null;\n  return Number(((c * 9 / 5) + 32).toFixed(2));\n}`,
        args: '[25.0]'
      },
      scalar_norm: {
        id: 'normalize_sensor',
        desc: 'Normalizes raw sensor value between 0.0 and 1.0',
        agg: 'false',
        code: `// Normalizes raw analog reading (0-4095) to engineering units (0.0-100.0%)\nfunction normalize_sensor(raw, min_val, max_val) {\n  if (raw === null || raw === undefined) return 0;\n  const min = min_val || 0;\n  const max = max_val || 4095;\n  const scaled = ((raw - min) / (max - min)) * 100.0;\n  return Math.max(0.0, Math.min(100.0, scaled));\n}`,
        args: '[2048, 0, 4095]'
      },
      agg_median: {
        id: 'moving_median',
        desc: 'Calculates the statistical median of a sliding window of numbers',
        agg: 'true',
        code: `// Window aggregate function receiving an array of values\nfunction moving_median(arr) {\n  if (!Array.isArray(arr) || arr.length === 0) return null;\n  const sorted = arr.slice().sort((a, b) => a - b);\n  const mid = Math.floor(sorted.length / 2);\n  return sorted.length % 2 !== 0 ? sorted[mid] : (sorted[mid - 1] + sorted[mid]) / 2;\n}`,
        args: '[[12.5, 18.2, 14.0, 16.8, 19.1]]'
      },
      agg_range: {
        id: 'peak_to_peak',
        desc: 'Calculates peak-to-peak difference (max - min) in window',
        agg: 'true',
        code: `// Computes peak-to-peak delta across temporal window\nfunction peak_to_peak(values) {\n  if (!Array.isArray(values) || values.length === 0) return 0;\n  let min = values[0];\n  let max = values[0];\n  for (let i = 1; i < values.length; i++) {\n    if (values[i] < min) min = values[i];\n    if (values[i] > max) max = values[i];\n  }\n  return Number((max - min).toFixed(3));\n}`,
        args: '[[4.2, 8.5, 3.1, 9.4, 6.7]]'
      }
    };

    function openJsUdfModal(id) {
      pluginsState.activeEditJsUdfId = id || null;
      const titleEl = document.getElementById('js-udf-modal-title');
      const idEl = document.getElementById('js-udf-modal-id');
      const aggEl = document.getElementById('js-udf-modal-agg');
      const descEl = document.getElementById('js-udf-modal-desc');
      const codeEl = document.getElementById('js-udf-modal-code');
      const argsEl = document.getElementById('js-udf-sandbox-args');
      const resEl = document.getElementById('js-udf-sandbox-result');

      resEl.textContent = 'Click "Run Test" to evaluate.';
      resEl.style.color = 'var(--text-secondary)';

      if (id) {
        const found = pluginsState.jsUdfs.find(u => u.id === id);
        titleEl.textContent = `Edit JavaScript Function: ${id}`;
        idEl.value = id;
        idEl.disabled = true;
        aggEl.value = String(found?.is_agg === true);
        descEl.value = found?.description || '';
        codeEl.value = found?.script || `function ${id}(x) {\n  return x;\n}`;
        argsEl.value = found?.is_agg ? '[[1, 2, 3, 4]]' : '[10]';
      } else {
        titleEl.textContent = 'New JavaScript User-Defined Function (UDF)';
        idEl.value = '';
        idEl.disabled = false;
        aggEl.value = 'false';
        descEl.value = '';
        loadJsUdfTemplate('scalar_temp');
      }

      document.getElementById('js-udf-modal').style.display = 'flex';
    }

    function closeJsUdfModal() {
      document.getElementById('js-udf-modal').style.display = 'none';
    }

    function loadJsUdfTemplate(key) {
      if (!key || !JS_TEMPLATES[key]) return;
      const t = JS_TEMPLATES[key];
      if (!pluginsState.activeEditJsUdfId) {
        document.getElementById('js-udf-modal-id').value = t.id;
        document.getElementById('js-udf-modal-desc').value = t.desc;
        document.getElementById('js-udf-modal-agg').value = t.agg;
      }
      document.getElementById('js-udf-modal-code').value = t.code;
      document.getElementById('js-udf-sandbox-args').value = t.args;
      runJsUdfTestSandbox();
    }

    function handleJsUdfKindChange() {
      const isAgg = document.getElementById('js-udf-modal-agg').value === 'true';
      if (!pluginsState.activeEditJsUdfId) {
        loadJsUdfTemplate(isAgg ? 'agg_median' : 'scalar_temp');
      }
    }

    function runJsUdfTestSandbox() {
      const code = document.getElementById('js-udf-modal-code').value;
      const funcId = document.getElementById('js-udf-modal-id').value.trim() || 'func';
      const rawArgs = document.getElementById('js-udf-sandbox-args').value.trim();
      const resEl = document.getElementById('js-udf-sandbox-result');

      let parsedArgs = [];
      try {
        parsedArgs = JSON.parse(rawArgs);
        if (!Array.isArray(parsedArgs)) {
          throw new Error('Arguments must be specified as a JSON array, e.g. [25] or [[1, 2, 3]]');
        }
      } catch (err) {
        resEl.style.color = '#ef4444';
        resEl.textContent = `Arguments format error:\n${err.message}`;
        return;
      }

      try {
        const t0 = performance.now();
        const runner = new Function('args', `

          ${code}

          if (typeof ${funcId} !== 'function') {

            throw new Error("Function '" + ${JSON.stringify(funcId)} + "' is not declared in the script");

          }

          return ${funcId}(...args);

        `);
        const output = runner(parsedArgs);
        const t1 = performance.now();
        const duration = (t1 - t0).toFixed(2);

        resEl.style.color = '#10b981';
        resEl.textContent = `✓ Sandbox Passed (${duration} ms):\nOutput: ${JSON.stringify(output, null, 2)}\nReturn Type: ${typeof output}`;
      } catch (err) {
        resEl.style.color = '#ef4444';
        resEl.textContent = `✗ Execution Failed:\n${err.message}`;
      }
    }

    async function submitJsUdfModal() {
      const id = document.getElementById('js-udf-modal-id').value.trim();
      const is_agg = document.getElementById('js-udf-modal-agg').value === 'true';
      const description = document.getElementById('js-udf-modal-desc').value.trim();
      const script = document.getElementById('js-udf-modal-code').value;

      if (!id) {
        showToast('Function name identifier is required', 'warning');
        return;
      }
      if (!script.trim()) {
        showToast('JavaScript implementation cannot be empty', 'warning');
        return;
      }

      const payload = { id, description, script, is_agg };
      const isUpdate = pluginsState.activeEditJsUdfId !== null;
      const endpoint = isUpdate ? `/udf/javascript/${encodeURIComponent(id)}` : '/udf/javascript';
      const method = isUpdate ? 'PUT' : 'POST';

      const res = await apiFetch(endpoint, {
        method,
        headers: { 'Content-Type': 'application/json' },
        body: payload
      });

      if (res.ok) {
        showToast(`JavaScript UDF '${id}' saved and compiled`, 'success');
        closeJsUdfModal();
        await fetchPluginsHubData();
      } else {
        const msg = typeof res.body === 'string' ? res.body : (res.body?.message || `Failed to save function (${res.status})`);
        showToast(msg, 'error');
      }
    }

    async function deleteJsUdf(id) {
      if (!confirm(`Are you sure you want to delete JavaScript function '${id}'? This will unregister it from SQL evaluation.`)) return;
      const res = await apiFetch(`/udf/javascript/${encodeURIComponent(id)}`, { method: 'DELETE' });
      if (res.ok) {
        showToast(`Function '${id}' deleted`, 'info');
        await fetchPluginsHubData();
      } else {
        showToast(`Delete failed (${res.status})`, 'error');
      }
    }

    // --- Services Hub Panel Logic ---
    function renderServicesTable() {
      const sBody = document.getElementById('services-tbody');
      const sfBody = document.getElementById('service-funcs-tbody');
      const services = pluginsState.services;
      const serviceFuncs = pluginsState.serviceFunctions;

      if (services.length === 0) {
        sBody.innerHTML = `

          <tr>

            <td colspan="4" class="empty-state">

              <div style="font-size: 13px; font-weight: 600; margin-bottom: 4px;">No external RPC services registered</div>

              <div style="font-size: 11px; color: var(--text-muted); margin-bottom: 12px;">Connect external microservices (REST/gRPC) and expose their endpoints as callable SQL functions.</div>

              <button class="btn btn-sm btn-primary" onclick="openServiceRegisterModal()">+ Register First Service 🌐</button>

            </td>

          </tr>`;
      } else {
        sBody.innerHTML = services.map(s => {
          const ifaces = s.interfaces ? Object.keys(s.interfaces).join(', ') : '(none)';
          const addr = s.about?.file || Object.values(s.interfaces || {})[0]?.addr || 'http://127.0.0.1';
          return `

            <tr>

              <td><span style="font-family: var(--font-mono); font-weight: 600; font-size: 13px;">${escapeHtml(s.name)}</span></td>

              <td><code style="font-size: 12px; color: var(--text-secondary);">${escapeHtml(addr)}</code></td>

              <td><span class="badge badge-indigo">${escapeHtml(ifaces)}</span></td>

              <td style="text-align: right;">

                <button class="btn btn-sm" style="color: var(--rose-text);" onclick="deleteService('${escapeHtml(s.name)}')">Delete 🗑</button>

              </td>

            </tr>`;
        }).join('');
      }

      if (serviceFuncs.length === 0) {
        sfBody.innerHTML = `<tr><td colspan="4" class="empty-state">No methods registered across external services.</td></tr>`;
      } else {
        sfBody.innerHTML = serviceFuncs.map(f => `

          <tr>

            <td><span style="font-family: var(--font-mono); font-weight: 700; color: #8b5cf6;">${escapeHtml(f.func_name || f.method_name)}()</span></td>

            <td><span class="badge badge-slate">${escapeHtml(f.service_name || '')}</span></td>

            <td><code>${escapeHtml(f.interface_name || '')}</code></td>

            <td><code style="font-size: 11px; color: var(--text-muted);">${escapeHtml(f.addr || '')} &rarr; ${escapeHtml(f.method_name || '')}</code></td>

          </tr>`).join('');
      }
    }

    function openServiceRegisterModal() {
      document.getElementById('service-modal-name').value = '';
      document.getElementById('service-modal-addr').value = 'http://127.0.0.1:8080';
      document.getElementById('service-modal-iface').value = 'api';
      document.getElementById('service-modal-methods').value = 'predict, classify';
      document.getElementById('service-register-modal').style.display = 'flex';
    }

    function closeServiceRegisterModal() {
      document.getElementById('service-register-modal').style.display = 'none';
    }

    async function submitServiceRegister() {
      const name = document.getElementById('service-modal-name').value.trim();
      const addr = document.getElementById('service-modal-addr').value.trim();
      const iface = document.getElementById('service-modal-iface').value.trim();
      const methodsRaw = document.getElementById('service-modal-methods').value.trim();

      if (!name) { showToast('Service name is required', 'warning'); return; }
      if (!addr) { showToast('Service endpoint address is required', 'warning'); return; }
      if (!iface) { showToast('Interface identifier is required', 'warning'); return; }

      const methods = methodsRaw.split(',').map(m => m.trim()).filter(Boolean);
      const payload = {
        name,
        About: { file: addr },
        Interfaces: {
          [iface]: {
            addr,
            methods
          }
        }
      };

      const res = await apiFetch('/services', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: payload
      });

      if (res.ok) {
        showToast(`Service '${name}' registered with ${methods.length} callable methods`, 'success');
        closeServiceRegisterModal();
        await fetchPluginsHubData();
      } else {
        const msg = typeof res.body === 'string' ? res.body : (res.body?.message || `Failed to register service (${res.status})`);
        showToast(msg, 'error');
      }
    }

    async function deleteService(name) {
      if (!confirm(`Are you sure you want to unregister service '${name}'?`)) return;
      const res = await apiFetch(`/services/${encodeURIComponent(name)}`, { method: 'DELETE' });
      if (res.ok) {
        showToast(`Service '${name}' deleted`, 'info');
        await fetchPluginsHubData();
      } else {
        showToast(`Delete failed (${res.status})`, 'error');
      }
    }

    // --- File Storage Hub Panel Logic ---
    function renderUploadsTable() {
      const tbody = document.getElementById('uploads-tbody');
      const files = pluginsState.uploads;

      if (files.length === 0) {
        tbody.innerHTML = `

          <tr>

            <td colspan="4" class="empty-state">

              <div style="font-size: 13px; font-weight: 600; margin-bottom: 4px;">No configuration files stored</div>

              <div style="font-size: 11px; color: var(--text-muted); margin-bottom: 12px;">Upload TLS certificates, Proto3 files, ML models, or custom binary codecs.</div>

              <button class="btn btn-sm btn-primary" onclick="openFileUploadModal()">Upload First Artifact 📁</button>

            </td>

          </tr>`;
        return;
      }

      tbody.innerHTML = files.map(name => {
        const edgePath = `data/uploads/${name}`;
        let hint = 'Referenced in configuration keys & rules';
        if (name.endsWith('.pem') || name.endsWith('.crt') || name.endsWith('.key')) hint = 'TLS Certificate / Key';
        else if (name.endsWith('.proto')) hint = 'Protobuf v3 Contract';
        else if (name.endsWith('.wasm')) hint = 'Wasm Executable Codec';
        else if (name.endsWith('.onnx')) hint = 'Neural Inference Model';

        return `

          <tr>

            <td>

              <div style="display: flex; align-items: center; gap: 8px;">

                <span style="font-size: 16px;">📄</span>

                <span style="font-family: var(--font-mono); font-weight: 600;">${escapeHtml(name)}</span>

              </div>

            </td>

            <td><code style="font-size: 12px; color: var(--text-secondary);">${escapeHtml(edgePath)}</code></td>

            <td><span class="badge badge-slate">${escapeHtml(hint)}</span></td>

            <td style="text-align: right;">

              <div style="display: inline-flex; gap: 6px;">

                <button class="btn btn-sm" onclick="copyUploadFilePath('${escapeHtml(edgePath)}')">Copy Path 📋</button>

                <button class="btn btn-sm" style="color: var(--rose-text);" onclick="deleteUploadFile('${escapeHtml(name)}')">Delete 🗑</button>

              </div>

            </td>

          </tr>`;
      }).join('');
    }

    function copyUploadFilePath(path) {
      navigator.clipboard.writeText(path).then(() => {
        showToast(`Copied '${path}' to clipboard`, 'info');
      }).catch(e => {
        showToast(`Copy failed: ${e.message}`, 'error');
      });
    }

    function openFileUploadModal() {
      pluginsState.uploadFileData = null;
      pluginsState.uploadFileName = '';
      document.getElementById('upload-modal-name').value = '';
      document.getElementById('upload-modal-file-label').textContent = 'Click or Drag & Drop File Here';
      document.getElementById('upload-modal-submit-btn').disabled = true;
      document.getElementById('file-upload-modal').style.display = 'flex';
    }

    function closeFileUploadModal() {
      document.getElementById('file-upload-modal').style.display = 'none';
    }

    function handleModalFileSelect(event) {
      const file = event.target.files?.[0];
      if (!file) return;
      pluginsState.uploadFileName = file.name;
      document.getElementById('upload-modal-name').value = file.name;
      document.getElementById('upload-modal-file-label').textContent = `${file.name} (${Math.round(file.size / 1024)} KB)`;
      document.getElementById('upload-modal-submit-btn').disabled = false;

      const reader = new FileReader();
      reader.onload = e => {
        pluginsState.uploadFileData = e.target.result;
      };
      reader.readAsText(file);
    }

    async function submitFileUpload() {
      const name = document.getElementById('upload-modal-name').value.trim();
      const content = pluginsState.uploadFileData || '';

      if (!name) {
        showToast('Filename is required', 'warning');
        return;
      }

      const res = await apiFetch('/config/uploads', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: { name, content }
      });

      if (res.ok) {
        showToast(`Artifact '${name}' stored in data/uploads/`, 'success');
        closeFileUploadModal();
        await fetchPluginsHubData();
      } else {
        const msg = typeof res.body === 'string' ? res.body : (res.body?.message || `Upload failed (${res.status})`);
        showToast(msg, 'error');
      }
    }

    async function deleteUploadFile(name) {
      if (!confirm(`Are you sure you want to delete file '${name}' from edge storage?`)) return;
      const res = await apiFetch(`/config/uploads/${encodeURIComponent(name)}`, { method: 'DELETE' });
      if (res.ok) {
        showToast(`File '${name}' deleted`, 'info');
        await fetchPluginsHubData();
      } else {
        showToast(`Delete failed (${res.status})`, 'error');
      }
    }

    // --- Data Backup & Migration Panel Logic ---
    function toggleExportAll(checked) {
      const box = document.getElementById('export-details-box');
      if (box) box.style.opacity = checked ? '1' : '0.5';
    }

    async function triggerDataExport(format) {
      showToast(`Generating ${format.toUpperCase()} export snapshot...`, 'info');
      try {
        const endpoint = format === 'yaml' ? '/v2/data/export' : '/data/export';
        const res = await fetch(endpoint);
        if (!res.ok) throw new Error(`Export request failed (${res.status})`);

        const blob = await res.blob();
        const url = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = `rekuiper_snapshot_${new Date().toISOString().slice(0, 10)}.${format}`;
        document.body.appendChild(a);
        a.click();
        a.remove();
        window.URL.revokeObjectURL(url);
        showToast(`Snapshot exported successfully (${format.toUpperCase()})`, 'success');
      } catch (err) {
        showToast(`Export error: ${err.message}`, 'error');
      }
    }

    function handleImportFileSelect(event) {
      const file = event.target.files?.[0];
      if (!file) return;
      pluginsState.importFileName = file.name;
      document.getElementById('import-file-label').textContent = `${file.name} (${Math.round(file.size / 1024)} KB)`;
      document.getElementById('import-submit-btn').disabled = false;

      const reader = new FileReader();
      reader.onload = e => {
        pluginsState.importFileContent = e.target.result;
      };
      reader.readAsText(file);
    }

    async function submitDataImport() {
      const content = pluginsState.importFileContent;
      if (!content) {
        showToast('Please select a valid JSON or YAML snapshot first', 'warning');
        return;
      }

      const stopRules = document.getElementById('import-stop-rules').checked;
      const statusBox = document.getElementById('import-status-box');
      statusBox.style.display = 'block';
      statusBox.style.background = 'var(--bg-subtle)';
      statusBox.style.color = 'var(--text-secondary)';
      statusBox.textContent = 'Applying snapshot & reconciling topology...';

      try {
        let payload = null;
        try {
          payload = JSON.parse(content);
        } catch (_) {
          payload = { content };
        }

        const endpoint = `/data/import?stop=${stopRules ? '1' : '0'}`;
        const res = await apiFetch(endpoint, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: payload
        });

        if (res.ok) {
          statusBox.style.background = '#ecfdf5';
          statusBox.style.color = '#065f46';
          statusBox.textContent = `✓ Import succeeded: Snapshot applied & reconciled.`;
          showToast('Topology restored & reconciled', 'success');
          await refreshAll();
          await fetchPluginsHubData();
        } else {
          statusBox.style.background = '#fef2f2';
          statusBox.style.color = '#991b1b';
          const msg = typeof res.body === 'string' ? res.body : (res.body?.message || `Import failed (${res.status})`);
          statusBox.textContent = `✗ Import failed: ${msg}`;
          showToast(msg, 'error');
        }
      } catch (err) {
        statusBox.style.background = '#fef2f2';
        statusBox.style.color = '#991b1b';
        statusBox.textContent = `✗ Parse error: ${err.message}`;
        showToast(err.message, 'error');
      }
    }

    // Initialize
    checkQuickStartBannerPreference();
    checkConsoleAuthStatus();
    loadPresetPayload('/v1/metrics');
    refreshAll(false);
    updatePollInterval(2000);
  </script>
</body>
</html>