

CREATE TABLE IF NOT EXISTS gateway_operation_log (
    id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY,
    created_at timestamptz NOT NULL DEFAULT now(),
    request_id text NOT NULL,
    operation text,
    table_name text,
    client text,
    method text,
    path text,
    status_code integer,
    duration_ms bigint,
    details jsonb,
    time numeric NOT NULL,
    error boolean DEFAULT false,
    message text,
    cache_key text,
    PRIMARY KEY (id)
);

-- ---------------------------------------------------------------------------
-- Athena clients catalog
-- ---------------------------------------------------------------------------

CREATE TABLE IF NOT EXISTS athena_clients (
    id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY,
    created_at timestamptz NOT NULL DEFAULT now(),
    athena_client_id uuid NOT NULL DEFAULT gen_random_uuid() UNIQUE,
    client_name text NOT NULL,
    description text,
    pg_uri text,
    pg_uri_env_var text,
    config_uri_template text,
    source text NOT NULL DEFAULT 'database',
    is_active boolean NOT NULL DEFAULT true,
    is_frozen boolean NOT NULL DEFAULT false,
    last_synced_from_config_at timestamptz,
    last_seen_at timestamptz,
    metadata jsonb NOT NULL DEFAULT '{}'::jsonb,
    updated_at timestamptz NOT NULL DEFAULT now(),
    deleted_at timestamptz,
    CONSTRAINT athena_clients_source_check CHECK (
        source IN ('config', 'database', 'merged')
    ),
    CONSTRAINT athena_clients_connection_check CHECK (
        pg_uri IS NOT NULL
        OR pg_uri_env_var IS NOT NULL
        OR config_uri_template IS NOT NULL
    )
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_athena_clients_client_name_active
    ON athena_clients (lower(client_name))
    WHERE deleted_at IS NULL;

CREATE INDEX IF NOT EXISTS idx_athena_clients_source
    ON athena_clients (source)
    WHERE deleted_at IS NULL;

CREATE INDEX IF NOT EXISTS idx_athena_clients_active
    ON athena_clients (is_active, is_frozen)
    WHERE deleted_at IS NULL;

CREATE TABLE IF NOT EXISTS client_statistics (
    id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY,
    created_at timestamptz NOT NULL DEFAULT now(),
    client_name text NOT NULL,
    total_requests bigint NOT NULL DEFAULT 0,
    successful_requests bigint NOT NULL DEFAULT 0,
    failed_requests bigint NOT NULL DEFAULT 0,
    total_cached_requests bigint NOT NULL DEFAULT 0,
    total_operations bigint NOT NULL DEFAULT 0,
    last_request_at timestamptz,
    last_operation_at timestamptz,
    updated_at timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT client_statistics_client_name_unique UNIQUE (client_name)
);

CREATE TABLE IF NOT EXISTS client_table_statistics (
    id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY,
    created_at timestamptz NOT NULL DEFAULT now(),
    client_name text NOT NULL,
    table_name text NOT NULL,
    operation text NOT NULL,
    total_operations bigint NOT NULL DEFAULT 0,
    error_operations bigint NOT NULL DEFAULT 0,
    last_operation_at timestamptz,
    updated_at timestamptz NOT NULL DEFAULT now(),
    CONSTRAINT client_table_statistics_unique UNIQUE (client_name, table_name, operation)
);

CREATE INDEX IF NOT EXISTS idx_client_table_statistics_client_name
    ON client_table_statistics (client_name);

CREATE INDEX IF NOT EXISTS idx_client_table_statistics_table_name
    ON client_table_statistics (table_name);

CREATE TABLE IF NOT EXISTS client_alert_queries (
    id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
    created_at timestamptz NOT NULL DEFAULT now(),
    client_name text,
    summary text,
    db_statement text,
    elapsed_secs numeric,
    slow_threshold_secs numeric,
    rows_affected bigint,
    rows_returned bigint
);

CREATE INDEX IF NOT EXISTS idx_client_alert_queries_created_at
    ON client_alert_queries (created_at DESC);

CREATE INDEX IF NOT EXISTS idx_client_alert_queries_client_name
    ON client_alert_queries (client_name)
    WHERE client_name IS NOT NULL;

-- ---------------------------------------------------------------------------
-- Connection pool occupancy snapshots
-- ---------------------------------------------------------------------------

CREATE TABLE IF NOT EXISTS client_connections (
    id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
    recorded_at timestamptz NOT NULL DEFAULT now(),
    client_name text NOT NULL,
    host text,
    instance_id uuid NOT NULL,
    pool_size integer NOT NULL,
    idle_connections integer NOT NULL,
    active_connections integer NOT NULL,
    max_connections integer NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_client_connections_client_recorded
    ON client_connections (client_name, recorded_at DESC);

CREATE INDEX IF NOT EXISTS idx_client_connections_instance
    ON client_connections (instance_id);

-- ---------------------------------------------------------------------------
-- Query history and saved queries
-- ---------------------------------------------------------------------------

CREATE TABLE IF NOT EXISTS public.query_history (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    query TEXT NOT NULL,
    client_name TEXT,
    status TEXT NOT NULL DEFAULT 'success',
    execution_time_ms DOUBLE PRECISION,
    error_message TEXT,
    row_count INTEGER,
    executed_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_query_history_client
    ON public.query_history(client_name);

CREATE INDEX IF NOT EXISTS idx_query_history_executed
    ON public.query_history(executed_at DESC);

CREATE TABLE IF NOT EXISTS public.saved_queries (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name TEXT NOT NULL,
    description TEXT,
    query TEXT NOT NULL,
    client_name TEXT,
    schema_name TEXT DEFAULT 'public',
    tags TEXT[] DEFAULT '{}',
    created_by TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_saved_queries_client
    ON public.saved_queries(client_name);

CREATE INDEX IF NOT EXISTS idx_saved_queries_created
    ON public.saved_queries(created_at DESC);

-- ---------------------------------------------------------------------------
-- UI request log (used by the Web Explorer)
-- ---------------------------------------------------------------------------

CREATE TABLE IF NOT EXISTS public.ui_request_log (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    method TEXT NOT NULL,
    path TEXT NOT NULL,
    athena_url TEXT NOT NULL,
    client_name TEXT,
    status_code INTEGER,
    duration_ms DOUBLE PRECISION,
    error_message TEXT,
    request_body JSONB,
    response_preview TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_ui_request_log_created
    ON public.ui_request_log(created_at DESC);

CREATE INDEX IF NOT EXISTS idx_ui_request_log_client
    ON public.ui_request_log(client_name);

CREATE INDEX IF NOT EXISTS idx_ui_request_log_path
    ON public.ui_request_log(path);
