mnestic (Python)

Embedded graph + vector + full-text database with Datalog queries — a maintained fork of CozoDB, tuned as a substrate for agentic memory. This package is the in-process Python binding (no server required).

mnestic is not the official CozoDB and is not affiliated with or endorsed by its original authors. All credit for the original design belongs to Ziyang Hu and the Cozo Project Authors. See the fork repository for provenance and licensing.

pip install mnestic

from mnestic import CozoDbPy

db = CozoDbPy("mem", "", "{}")  # engines: "mem", "sqlite" (file path), "rocksdb" (dir path)
db.run_script("?[x] <- [[1],[2],[3]]", {}, False)

# One-call hybrid retrieval (HNSW + full-text fused with Reciprocal Rank Fusion),
# over a relation that has an HNSW index and an FTS index:
hits = db.hybrid_search({
    "relation": "docs",
    "vector_index": "vec", "query_vector": [0.1, 0.9], "vector_k": 5,
    "fts_index": "fts", "query_text": "vector search", "fts_k": 5,
})
# -> {"headers": ["id", "score"], "rows": [["d3", 0.033], ...], "next": None}

# Pass "detailed": True for per-leg contributions — one row per (item, leg)
# with the within-leg rank the fusion used and the leg's raw score:
# headers ["id","score","list_id","leg_rank","leg_score"]

The "rocksdb" persistent backend now ships in the published wheel — CozoDbPy("rocksdb", "./my.db", "{}") works straight from pip install mnestic. The source distribution stays SQLite/compact-only, so the persistent engine is wheel-only.

Upgrade note (0.10.6): a persistent database whose relation catalogs were last written by a build older than 0.10.0 could fail to open with Cannot deserialize relation metadata from bytes after upgrading to 0.10.0–0.10.5. 0.10.6 fixes this — legacy catalogs open again with no migration, so upgrade to 0.10.6 if you carry a pre-0.10.0 database.

run_script takes an optional timeout= — a per-query wall-clock budget in seconds; on expiry the query raises an eval::timeout error. db.set_default_query_timeout(secs) sets a Db-wide default and db.default_query_timeout() reads it back; the effective budget for a query is the minimum of that default and any per-call timeout.

RDF at the boundary — and what it means for the wheel's trust posture

The wheel ships the rdf-io engine feature: RdfReader reads Turtle, N-Triples, N-Quads and TriG into a fixed 6-column relational shape (subject, predicate, object, graph, language_tag, datatype) straight from CozoScript, and IRI helper functions (iri_valid, iri_resolve, curie_expand, curie_compact) handle boundary identity:

db.run_script("""
    triples[s, p, o, g, lang, dt] <~ RdfReader(url: 'file://./data.ttl')
    ?[s, o] := triples[s, 'http://xmlns.com/foaf/0.1/knows', o, _, _, _]
""", {}, True)

Read this before running untrusted CozoScript. rdf-io implies the engine's data-import trust gate, so this wheel — deliberately reversing the 0.14.0 posture — again registers script-controlled readers: RdfReader, CsvReader and JsonReader can read any file the process can read, and because the wheel also compiles HTTP support (requests), a script can fetch non-file:// URLs. Only run CozoScript from callers you trust with those capabilities, or build the binding from source without the rdf-io feature for a locked-down deployment.

New in 0.15.0

The Python-facing highlights of this operations-and-interchange release:

Bound query memory. A script may set :mem_limit <bytes> and receives the typed eval::mem_budget_exceeded error before commit if it trips. Rust and server hosts also expose per-call and database-wide ceilings.
RDF import is included in wheels. RdfReader accepts Turtle, N-Triples, N-Quads, and TriG; IRI/CURIE helpers are available in CozoScript. The raw source remains relational rather than becoming a triple-native store.
Share RocksDB memory across databases. Pass a shared_memory object in the RocksDB options JSON to join the process-wide block-cache/write-buffer envelope. Detailed memory-stat accessors are currently Rust-only.
Model nested data deliberately. The runnable JSON-LD/tree guide covers parent/child rows, positional arrays, and heterogeneous adjacency.

Migration highlight: enabling RDF reach reverses the 0.14.0 wheel-reader default. The wheel registers RdfReader, CsvReader, and JsonReader, and its compiled HTTP support lets trusted CozoScript fetch non-file:// URLs. Run only trusted scripts, or build from source without rdf-io for a locked-down deployment. Memory budgets and shared RocksDB resources remain opt-in, and no storage migration is required.

See the fork changelog for the full accounting, and for 0.13.0's upgrade guidance if you are coming from an earlier release (::reindex for HNSW/FTS indexes, pre-1970 timestamps, and the hybrid-leg ranking changes).

For idiomatic LangChain / LlamaIndex usage, install the integration packages (langchain-mnestic, llama-index-vector-stores-mnestic).

The query language (CozoScript / Datalog) and engine semantics follow CozoDB; see the upstream documentation and the fork changelog.

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