Elior Nataf LackritzandGitHub
36a505ac65
Depends on #8535 `libs/checkpoint-conformance/tests/` only validates `InMemorySaver`. `checkpoint-sqlite` has had a `test_conformance_delta.py` for a while, but it guards on `importorskip("langgraph.checkpoint.conformance")` and the package was never in its test environment — so it has been skipping silently every run. `checkpoint-postgres` had no runner at all. Net effect: the shared checkpointer contract was effectively unenforced everywhere except in-memory. ### Change Adds `langgraph-checkpoint-conformance` to the `test` dependency group of both packages, with a path source like the existing `langgraph-checkpoint` entry. That alone is what makes sqlite's runner start executing. Postgres gets the equivalent runner. Both pass the `delta_channel_history` capability. ### Why it's stacked Against `main`'s Postgres, the new runner fails: ``` Capability delta_channel_history failed: test_history_migration_plain_value_as_seed ``` That is exactly the bug #8535 fixes, and it had been failing unnoticed precisely because nothing ran the suite there. So this is based on that branch rather than `main` — the diff here is the one conformance commit, and it will retarget once #8535 lands. Reasonable to read that as the change justifying itself: the first thing turning the suite on did was catch a real bug that had been sitting in `main`. ### Verified `checkpoint-postgres` 270 passed on PG 15 and 16, `checkpoint-sqlite` 118 passed, lint and `ty` clean in both. The `uv.lock` updates are the conformance package entry only. ### Note The sync `PostgresSaver` and `SqliteSaver` aren't covered — the conformance harness reports every capability as `detected=False` for them, so only the async savers are exercised. Pre-existing and not addressed here, but worth knowing the coverage isn't total.
LangGraph SQLite Checkpoint
To help you ship LangGraph apps to production faster, check out LangSmith. LangSmith is a unified developer platform for building, testing, and monitoring LLM applications.
Quick Install
uv add langgraph-checkpoint-sqlite
🤔 What is this?
This library provides a SQLite implementation of LangGraph's checkpoint saver, with both sync and async support via aiosqlite. Use it when you want LangGraph state persistence backed by SQLite for local development, testing, or lightweight deployments.
📖 Documentation
For full documentation, see the API reference. For conceptual guides on persistence and memory, see the LangGraph Docs.
Security
Important
Set
LANGGRAPH_STRICT_MSGPACK=trueor pass an explicitallowed_msgpack_moduleslist when creating your checkpointer. This restricts checkpoint deserialization to known-safe types, preventing code execution if the database is compromised. See the langgraph-checkpoint README for details.
Usage
from langgraph.checkpoint.sqlite import SqliteSaver
write_config = {"configurable": {"thread_id": "1", "checkpoint_ns": ""}}
read_config = {"configurable": {"thread_id": "1"}}
with SqliteSaver.from_conn_string(":memory:") as checkpointer:
checkpoint = {
"v": 4,
"ts": "2024-07-31T20:14:19.804150+00:00",
"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
"channel_values": {
"my_key": "meow",
"node": "node"
},
"channel_versions": {
"__start__": 2,
"my_key": 3,
"start:node": 3,
"node": 3
},
"versions_seen": {
"__input__": {},
"__start__": {
"__start__": 1
},
"node": {
"start:node": 2
}
},
}
# store checkpoint
checkpointer.put(write_config, checkpoint, {}, {})
# load checkpoint
checkpointer.get(read_config)
# list checkpoints
list(checkpointer.list(read_config))
Async
from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
async with AsyncSqliteSaver.from_conn_string(":memory:") as checkpointer:
checkpoint = {
"v": 4,
"ts": "2024-07-31T20:14:19.804150+00:00",
"id": "1ef4f797-8335-6428-8001-8a1503f9b875",
"channel_values": {
"my_key": "meow",
"node": "node"
},
"channel_versions": {
"__start__": 2,
"my_key": 3,
"start:node": 3,
"node": 3
},
"versions_seen": {
"__input__": {},
"__start__": {
"__start__": 1
},
"node": {
"start:node": 2
}
},
}
# store checkpoint
await checkpointer.aput(write_config, checkpoint, {}, {})
# load checkpoint
await checkpointer.aget(read_config)
# list checkpoints
[c async for c in checkpointer.alist(read_config)]
📕 Releases & Versioning
See our Releases and Versioning policies.
💁 Contributing
As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
For detailed information on how to contribute, see the Contributing Guide.