deer-flow

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History

chore(deps): bump langgraph-checkpoint to 4.2.0 / postgres 3.1.2 and delete the saver patch (#5734 )

* chore(checkpoint): bump to checkpoint 4.2.0 and drop the stale saver patch

langgraph-checkpoint 4.2.0 fixes the write dropped after a full -> delta
migration (upstream langchain-ai/langgraph#8526) and keeps its own
InMemorySaver override, so the compatibility patch in checkpoint_patches.py
could neither detect the fix nor stand down: it read langgraph's version
while InMemorySaver ships in langgraph-checkpoint, and it would have kept
shadowing the upstream implementation on 4.2.0. The postgres release 3.1.2
locates plain-value delta seeds (upstream #8535).

- floor langgraph-checkpoint>=4.2.0,<5.0 in the harness and raise the postgres
  extra to >=3.1.2,<3.2; langgraph's own >=4.1.0 would otherwise let a
  resolver reintroduce the bug now that the patch is gone
- delete the patch, its version guard, and the three implementation-assertion
  tests; test_full_to_delta_migration_replays_on_same_thread stays as the gate
  and fails on 4.1.1 without the patch (verified by a one-off unpatch run)
- langgraph stays 1.2.9 and langgraph-checkpoint-sqlite stays 3.1.1

Verification: make lint; delta checkpointer/cache/worker-resume suites green
with the migration gate passing on memory and sqlite (postgres params skip
without TEST_POSTGRES_URI). The full make test run before the packaging-pin
fix below was 13 failed / 18523 passed; 12 of those failures reproduce on main
with the same environment (git stash baseline, identical failure sets), 7 of
them because the local config.yaml runs checkpoint_channel_mode: delta. The
remaining one, the postgres-extra string pin in tests/test_checkpointer.py, is
updated here.

Upstream status for the surrounding gaps: cache parity across off/cold/warm
states, postgres pagination (langchain-ai/langgraph#8448) and parallel-superstep
replay order (#8382) are still open upstream, as is the abandoned-branch fork
fix (#8548) that the delta resume linearization in runtime/runs/worker.py works
around, so that path stays.

* docs(changelog): keep checkpoint upgrade in Unreleased

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

2026-09-23 09:18:26 +08:00

checkpoint_cache

fix(runtime): drain provider close across cancellation (#5622 )

2026-09-21 22:06:41 +08:00

checkpointer

feat(checkpoint): checkpoint history cache (#4638 )

2026-08-02 22:25:02 +08:00

events

fix(threads): clean persisted records safely on thread deletion (#5535 )

2026-09-18 18:32:42 +08:00

runs

fix(mcp): scope sessions and task access by thread incarnation (#5556 )