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feat(session): bound persistence write batching

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Tianyi Cui
2026-08-08 15:43:52 +08:00
parent 7ab20890e6
commit 924c954469
52 changed files with 763 additions and 126 deletions
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docs/core-data-structures/session.md
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@@ -561,7 +561,7 @@ interface TurnEndReasonMap {
## Execution enclosure and standalone events
A turn encloses one model-loop execution, not the whole session log. AgentLoop records injected `user/message` events only from entering pre-step batches inside a turn; plugin-owned log-only events may still appear between `turn/end` and the next `turn/start`, consuming event seqs without incrementing turn numbers. Persistence eagerly records every contiguous accepted event, while crash repair closes only a genuinely open trailing turn. A producer that needs a durability barrier explicitly awaits `ctx.sessions.flush(session)`.
A turn encloses one model-loop execution, not the whole session log. AgentLoop records injected `user/message` events only from entering pre-step batches inside a turn; plugin-owned log-only events may still appear between `turn/end` and the next `turn/start`, consuming event seqs without incrementing turn numbers. Persistence admits every contiguous accepted event into a bounded durable batch, while crash repair closes only a genuinely open trailing turn. A producer that needs an immediate durability barrier explicitly awaits `ctx.sessions.flush(session)`.
The optional `dsh-session/invariant` companion enforces the relations owned by core: turn and step numbering, execution-event enclosure, and same-step tool call/result pairing. Merge-extensible event relations belong to the plugin that declares them, so core does not reject an unknown event merely because no turn is open. See [the standalone-event decision](../../.agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.md).