graphmind 0.7.0

High-performance distributed graph database with OpenCypher support, RESP protocol, multi-tenancy, vector search, and web visualizer
Documentation 
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# Graphmind Graph Database Roadmap

This document outlines the development journey of Graphmind, from its inception as a property graph engine to its current state as a distributed, AI-native Graph Vector Database.

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## ✅ Completed Phases

### Phase 1: Core Property Graph Engine
**Goal**: Build the fundamental data structures for nodes, edges, and properties.
*   **Features**:
    *   In-memory `GraphStore` using HashMaps.
    *   Support for multiple labels and property types (String, Int, Float, Bool, etc.).
    *   Adjacency lists for O(1) traversal lookups.

### Phase 2: Query Engine & RESP Protocol
**Goal**: Enable interaction via standard tools.
*   **Features**:
    *   **OpenCypher Parser**: `MATCH`, `WHERE`, `RETURN`, `CREATE`, `ORDER BY`, `LIMIT`.
    *   **Volcano Executor**: Iterator-based query execution pipeline.
    *   **RESP Server**: Compatibility with Redis clients (`redis-cli`, Python/JS drivers).

### Phase 3: Persistence & Multi-Tenancy
**Goal**: Enterprise-grade durability and isolation.
*   **Features**:
    *   **RocksDB Storage**: Persistent storage with column families for Nodes/Edges/Indices.
    *   **WAL (Write-Ahead Log)**: Crash recovery and durability.
    *   **Multi-Tenancy**: Logical namespace isolation with resource quotas.

### Phase 4: High Availability (Raft)
**Goal**: Distributed consensus and failover.
*   **Features**:
    *   **Raft Consensus**: Leader election, log replication, and quorum safety via `openraft`.
    *   **Cluster Management**: Dynamic membership changes (add/remove nodes).

### Phase 5: RDF & Semantic Web
**Goal**: Interoperability with knowledge graphs.
*   **Features**:
    *   **Triple Store**: RDF data model support.
    *   **Serialization**: Turtle, N-Triples, RDF/XML support.

### Phase 6: Vector Search & AI Integration
**Goal**: Native AI support for RAG applications.
*   **Features**:
    *   **Vector Type**: Native `Vec<f32>` property support.
    *   **HNSW Indexing**: High-performance Approximate Nearest Neighbor search.
    *   **Graph RAG**: Hybrid queries combining vector similarity + graph traversal.
    *   **Cypher**: `CALL db.index.vector.queryNodes(...)`.

### Phase 7: Native Graph Algorithms
**Goal**: In-database analytics.
*   **Features**:
    *   **PageRank**: Node centrality scoring.
    *   **BFS/Dijkstra**: Shortest path algorithms.
    *   **WCC**: Community detection.
    *   **GraphView**: Optimized CSR-like projection for analytics speed.

### Phase 8: Query Optimization
**Goal**: Solve performance bottlenecks.
*   **Features**:
    *   **B-Tree Indices**: O(log n) property lookups.
    *   **Cost-Based Optimizer (CBO)**: Automatically selects indices over scans.
    *   **Performance**: Improved lookup speed by **5,800x** (115k QPS).

### Phase 9: Async Ingestion
**Goal**: Maximize write throughput.
*   **Features**:
    *   **Decoupled Architecture**: Writes are acked immediately; indexing happens in background.
    *   **Performance**: Restored ingestion to **~870k nodes/sec** (async benchmark); synchronous ingestion benchmarks at ~230K–360K nodes/sec depending on workload.

### Phase 10: Tenant Sharding
**Goal**: Horizontal scalability.
*   **Features**:
    *   **Request Router**: Distributes tenants across different Raft groups.
    *   **Proxy Layer**: Forwards requests to correct shards transparently.

### Phase 11: Native Visualizer
**Goal**: Developer Experience.
*   **Features**:
    *   **Embedded Web UI**: Served directly from binary at port 8080.
    *   **Force-Directed Graph**: Interactive visualization.
    *   **Query Workbench**: Run Cypher directly in the browser.

### Phase 12: "Auto-Embed" Pipelines (formerly Auto-RAG)
**Goal**: Native AI support for automatic data processing.
*   **Features**:
    *   **Tenant-Level Config**: Each tenant can have its own LLM provider and embedding policy.
    *   **Externalized LLMs**: Support for OpenAI, Ollama, and Gemini.
    *   **Automatic Embedding**: Background tasks automatically generate embeddings when text properties matching policies are updated.
    *   **Native Integration**: Built directly into the async indexing pipeline.

### Phase 13: Natural Language Querying (NLQ)
**Goal**: Query the graph using plain English.
*   **Features**:
    *   **Text-to-Cypher**: LLM-powered translation of user questions into valid Cypher queries.
    *   **Schema-Aware**: Injects tenant-specific schema into prompts for accuracy.
    *   **Safe Execution**: Defaults to read-only queries to prevent data loss.
    *   **Opt-In**: Configurable per tenant.

### Phase 14: Agentic Enrichment
**Goal**: Autonomous agents that maintain and enrich the graph.
*   **Features**:
    *   **Event-Driven**: Agents trigger on `NodeCreated` or `PropertySet` events based on policy.
    *   **Tool Use**: Agents can use tools (e.g., Web Search) to gather information.
    *   **Autonomous Updates**: Agents can write back to the graph to enrich properties.
    *   **Mock Tooling**: Initial support for mocked tools for testing and development.

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## 🔮 Future Roadmap

### 1. Time-Travel / Temporal Queries ⏳

### 3. Graph-Level Sharding
**Goal**: Massive scale for single graphs.
*   **Plan**: Partition *single* large graphs across nodes using Min-Cut algorithms (Metis), enabling trillion-edge scale (complexity: High).

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> **Detailed Backlog**: For a comprehensive, prioritized list of all planned work (~100 items across 13 categories), see [`graphmind-cloud/docs/BACKLOG.md`](https://git.graphmind.dev/fab679/graphmind-cloud/src/branch/main/docs/BACKLOG.md).