langgraph

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Elior Nataf LackritzandGitHub a5dbacae0d fix(checkpoint-postgres,checkpoint-sqlite): treat an empty checkpoint_id as the latest in delta history (#9262 )

`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.

2026-10-09 13:44:51 -04:00

__init__.py

checkpoint-sqlite: new library for sqlite checkpointer implementation (#1203 )

2024-08-02 22:14:12 +00:00

test_aiosqlite.py

fix(checkpoint-sqlite): harden (#6565 )

2025-12-09 16:47:55 -05:00

test_async_store.py

fix(checkpoint,checkpoint-postgres,checkpoint-sqlite): validate namespace labels before store dispatch (#9217 )

2026-10-08 16:10:55 -07:00

test_conformance_delta.py

test(checkpoint-postgres,checkpoint-sqlite): run the conformance suite (#8537 )