Sydney Runkle 4a6ddbb0e3 feat(delta-channel): store sentinel in blobs, reconstruct from checkpoint_writes ...

DeltaChannel.checkpoint() now returns a zero-byte DeltaChannelSentinel
instead of duplicating delta data in checkpoint_blobs. Reconstruction
walks the parent checkpoint chain via checkpoint_writes (which already
holds per-step writes) and replays them through the operator.

In-memory benchmark (100 turns, ~20K tokens):
  storage: 10.2 MB → 40.5 KB (251x reduction)
  read:    0.6ms → 7.9ms (reconstruction cost, amortized by storage savings)

InMemorySaver and PostgresSaver override get_channel_writes() with
efficient implementations (Python dict walk and recursive CTE respectively).
The base class fallback uses self.list() with a thread-local recursion guard.

2026-04-30 14:49:05 -04:00

..

cache

fix: flip default on base cache (#6677)

2026-01-12 15:26:37 -05:00

checkpoint

feat(delta-channel): store sentinel in blobs, reconstruct from checkpoint_writes

2026-04-30 14:49:05 -04:00

store

fix(checkpoint): don't add the task to the checkpoint batch if it was… (#7168)

2026-03-15 12:46:27 -07:00