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Prune LangGraph checkpoints per thread and delete them with the conversation #85

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ryan merged 1 commits from perf/prune-checkpoints into main 2026-10-13 03:42:05 -04:00
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Author SHA1 Message Date
Ryan Chen c329d15f7f Prune LangGraph checkpoints per thread and delete them with the conversation
CI / backend (pull_request) Successful in 42s
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CI / frontend (pull_request) Failing after 7s
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CI / backend (push) Successful in 42s
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Every graph step stores a full snapshot of the conversation, nothing pruned
old ones, and deleting a conversation left its thread behind (about 1.6 MB per
checkpoint at 200 turns). After each turn, only the newest
CHECKPOINT_KEEP_PER_THREAD (default 20) checkpoints of that thread are kept,
plus their pending writes; state reads only use the newest, and pruning a
200-checkpoint thread takes about 2 ms. Deleting a conversation also deletes
its thread, without failing the request if the checkpoint store errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
 2026-10-13 03:41:47 -04:00