Elior Nataf LackritzandGitHub
a5dbacae0d
`PostgresSaver` and `SqliteSaver`, sync and async, read a DeltaChannel's history from the latest checkpoint only when the config's `checkpoint_id` was missing or `None`. An empty one was looked up as an id, matched nothing, and came back with no seed and no writes, while their own `get_tuple` treats an empty id as the latest checkpoint, as the default implementation does. They now check for a missing or empty id the way `get_tuple` does. The in-memory saver gets the same in #9257. Graphs always pass the id of a saved checkpoint, so only direct callers of the saver API hit this. ## Tests - `test_{sync,async}_empty_checkpoint_id_reads_from_the_latest_checkpoint` in `checkpoint-postgres/tests/test_delta_pagination.py` and `checkpoint-sqlite/tests/test_delta_parent_walk.py`: all four fail on main. - The `checkpoint-postgres` (Postgres 16) and `checkpoint-sqlite` suites pass, and `lint_package` and `lint_tests` are clean in both.
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.