This package adds a versioning layer underneath the existing LadybugDB-backed query path. Each codragraph analyze produces an immutable, content-addressed snapshot of the knowledge graph. Branches, merges, and structured diffs operate on those snapshots; querying a historical snapshot materializes it back into an ephemeral LadybugDB so the existing Cypher/MCP surface keeps working unchanged.

Status

Developer preview. Capabilities:

Content-addressed object store (FsCAS)
Snapshot serializer (graph rows → CAS)
Snapshot materializer (CAS → fresh LadybugDB)
Branches (filesystem refs)
Commits + log
Structural diff (added/removed nodes & edges by table)
Semantic diff — signature / visibility / body / location / metadata classification
Three-way merge with conflict detection
Mark-and-sweep gc

Layout

src/
├── types.ts                  Branded ObjectId, Snapshot, Commit, Branch, GraphDiff
├── cas/
│   ├── interface.ts          ContentAddressedStore { put, get, has, list }
│   └── fs-cas.ts             Filesystem CAS — .codragraph/graphstore/objects/<aa>/<rest>
├── snapshot/
│   ├── row-source.ts         RowSource / RowSink — abstract over LadybugDB
│   ├── serializer.ts         Walk RowSource → emit Snapshot
│   └── materializer.ts       Read Snapshot → write rows into RowSink
├── history/
│   ├── commit.ts             createCommit, readCommit
│   ├── branch.ts             createBranch, listBranches, getHead, setHead, HEAD
│   └── log.ts                walkCommits backward
├── diff/
│   ├── structural.ts         Diff between two Snapshot ids
│   └── semantic.ts           Higher-level diff with change classification
└── merge/
    └── three-way.ts          LCA-based three-way merge with conflict detection

Quick start

import { FsCAS } from "@codragraph/graphstore/cas";
import { serializeSnapshot, materializeSnapshot } from "@codragraph/graphstore/snapshot";
import { createCommit, getHead, setHead } from "@codragraph/graphstore/history";
import { diffSnapshots } from "@codragraph/graphstore/diff";

const cas = new FsCAS({ root: ".codragraph/graphstore" });

// Take a snapshot
const snapshot = await serializeSnapshot({ source: cgdbRowSource, cas });
const commit = await createCommit({
  cas,
  snapshot: snapshot.id,
  parents: [],
  author: { name: "anit", email: "anit@example.com" },
  message: "initial index",
});
await setHead({ root: ".codragraph/graphstore", branch: "main", commit: commit.id });

// Diff two snapshots
const diff = await diffSnapshots({ cas, from: snapA.id, to: snapB.id });