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refactor(core): drop legacy compaction event (#33404)

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Kit Langton 2026-06-22 21:39:41 +02:00 • committed by GitHub
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specs/v2/schema-changelog.md
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@ -1,5 +1,11 @@
# V2 Schema Changelog
## 2026-06-22: Reset Unpublished Compaction Event
- Replace the unpublished `session.next.compaction.ended.1` payload with the current checkpoint payload and remove its legacy decoder.
- Reset experimental events, sequences, Session inputs, projected Session messages, Context Epochs, synchronized workspace rows, and Session workspace links.
- Preserve canonical V1 `session`, `message`, and `part` rows.
## 2026-06-22: Make Session Interruption Process-Local
- Remove the unprojected `session.next.interrupt.requested.1` event from the experimental durable Session event union and generated SDK.
@ -11,7 +17,7 @@
- Preserve the existing structured summary contract and update prior summaries with newly compacted history.
- Store token-bounded recent history as plain serialized text inside the checkpoint instead of replaying provider-native messages.
- Keep compaction starts durable and progress deltas live-only; activate history cutover only from a durable completed summary.
- Version the completed event as `session.next.compaction.ended.2` rather than changing the existing synchronized v1 payload in place.
- Store the completed event with the current checkpoint payload containing stable message identity, reason, summary, and recent context.
- Reload the replacement Context Epoch and continue the original pending turn after compaction.
- Preserve full durable history; compaction changes only the active model representation.
- Defer provider-overflow recovery, explicit manual compaction, and deterministic old tool-result pruning.

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specs/v2/session.md
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@ -107,7 +107,7 @@ Before each provider turn, the runner estimates the complete model-visible reque
Compaction keeps the full transcript durable while replacing its active model representation with one hidden checkpoint containing a structured rolling summary and token-bounded serialized recent context. Provider-native assistant, reasoning, and tool messages never survive across the boundary, avoiding signature and encrypted-reasoning failures when the earlier prefix changes.
`session.next.compaction.started.1` durably identifies the attempt. Compaction deltas are live-only progress. `session.next.compaction.ended.2` durably stores the final summary and serialized recent context; only this completed event projects a model-visible compaction message. On the next provider attempt, the runner observes that completed compaction and directly renders a fresh Context Epoch baseline. A failed or interrupted attempt therefore leaves the previous history boundary active.
`session.next.compaction.started.1` durably identifies the attempt. Compaction deltas are live-only progress. `session.next.compaction.ended.1` durably stores the final summary and serialized recent context; only this completed event projects a model-visible compaction message. On the next provider attempt, the runner observes that completed compaction and directly renders a fresh Context Epoch baseline. A failed or interrupted attempt therefore leaves the previous history boundary active.
Repeated compactions update the previous structured summary with newly compacted messages. The runner then reloads projected history and executes the original pending turn.