feat(db): add NeuG graph database as optional backend with native Cypher support#698
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BingqingLyu wants to merge 7 commits into
Open
feat(db): add NeuG graph database as optional backend with native Cypher support#698BingqingLyu wants to merge 7 commits into
BingqingLyu wants to merge 7 commits into
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NeuG (embedded graph DB with Cypher) can now be used instead of SQLite: codegraph init --backend neug Implements NeuGQueryBuilder with the same public API as QueryBuilder (duck typing), so GraphTraverser, MCP tools, and CLI work unchanged. Key details: - MERGE-based upserts preserve edges (no DETACH DELETE+CREATE) - Literal interpolation for CONTAINS and IN (NeuG 0.1.2 $param limitation) - Standalone test suite (npm run test:neug) — vitest excluded due to glog double-init abort in worker threads (see neug-segv-repro.js) - 32 integration tests against real NeuG binary, all passing Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implement 6 missing QueryBuilder methods (getNodeAndEdgeCount, getDominantFile, getTopRouteFile, getRoutingManifest, findNodesByExactName, findNodesByNameSubstring) so all existing CLI/MCP features work on the NeuG backend. Add executeCypher() for raw Cypher queries and expose it via `codegraph cypher <query>`. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Cover batch operations (insertNodes, insertEdges, updateNode), node query methods (getNodesByName, getNodesByQualifiedNameExact, getNodesByLowerName, getAllNodes, getAllNodeNames), file operations (getStaleFiles), unresolved reference lifecycle (deleteUnresolvedByNode, getUnresolvedByName, getUnresolvedReferencesBatch, getUnresolvedReferencesByFiles, deleteResolvedReferences, deleteSpecificResolvedReferences), status/routing methods (getDominantFile, getTopRouteFile, getRoutingManifest), and graph traversal (getCallees, getImpactRadius). 61 tests total. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Update README with architecture diagram, CLI reference, and a new Graph Database Backend section covering NeuG advantages over SQLite for graph operations. Remove SQLite hard-coding from MCP server instructions. Add design doc recording motivation, architecture, and implementation details. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Verify that all 3 Cypher examples from the upstream issue draft actually run on NeuG 0.1.2: variable-length paths, multi-hop pattern matching, and aggregation queries. Total test count: 61 → 67. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…e-neug/neug Replace `neug: file:neug-nodejs-0.1.2-osx_arm64.tgz` with the published `@graphscope-neug/neug@^0.1.2` package. Update all import references from `'neug'` to `'@graphscope-neug/neug'` in source and tests. Also fix NeuG link in design doc, refine README architecture diagram and platform support text. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Expose NeuG Cypher query capability through the MCP server so agents can execute arbitrary graph pattern matching. Returns tabular results, errors gracefully on SQLite backend. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
codegraph init --backend neug) as a drop-in alternative to SQLitecodegraph cypher <query>CLI command andcodegraph_cypherMCP tool expose native Cypher queries (NeuG only)@graphscope-neug/neugpackage (platform binaries: macOS ARM64, Linux x64)Motivation
Addresses #681.
CodeGraph currently stores its code knowledge graph in SQLite. While SQLite is proven and portable, using a relational database to simulate graph operations has inherent limitations:
NeuG addresses both with 4 key advantages:
codegraph cypherCLI,codegraph_cypherMCP tool, andexecuteCypher()API.Test plan
We're the NeuG team and happy to own this integration end-to-end — implementation, tests, and ongoing maintenance. Happy to discuss the approach.