Module persistence 

Persistence layer for knowledge graphs (workspace management always available) Persistence layer for GraphRAG knowledge graphs

This module provides storage backends for persisting knowledge graphs to disk and loading them back into memory for fast querying.

Supported Formats

• Parquet: Columnar format for entities, relationships, chunks (Apache Arrow ecosystem)
• LanceDB: Vector storage for embeddings (Lance columnar format)
• JSON: Human-readable backup format (already implemented in core)
• GraphML: Export format for visualization tools (already implemented in core)

Architecture

workspace/
├── default/
│   ├── entities.parquet
│   ├── relationships.parquet
│   ├── chunks.parquet
│   ├── documents.parquet
│   ├── vectors.lance/
│   ├── graph.json
│   └── metadata.toml
└── project_a/
    └── ...

Example

use graphrag_core::{KnowledgeGraph, persistence::WorkspaceManager};

// Create workspace manager
let workspace = WorkspaceManager::new("./workspace")?;

// Save graph to default workspace
let graph = KnowledgeGraph::new();
workspace.save_graph(&graph, "default")?;

// Load graph from workspace
let loaded_graph = workspace.load_graph("default")?;

Re-exports

pub use workspace::WorkspaceManager;

pub use workspace::WorkspaceMetadata;

pub use workspace::WorkspaceInfo;

Modules

workspace

Workspace management for GraphRAG persistence

Traits

Persistence

Persistence trait for knowledge graphs