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The sent-ledger is append-once and the OTLP span id derives from the same deduplication key, so the pipeline assumes a served call is immutable: same key, same value, forever. Copilot's serve-time reconciliation is the first producer that breaks that (#988), three ways inside one session — a shutdown residual shrinks as the store rows covering it land, a rollup is dropped once rows cover its leg, and an unpaired row becomes supplementary when its journal call appears. Sent at an intermediate state, the receiver keeps that state forever AND receives what supersedes it. Local reports re-reconcile every pass and were never affected; this is only about what leaves the machine. Value-versioned keys were the other option, but usage spans have no upsert contract — receivers sum them, so a superseding span adds rather than replaces. (Attribution can do it because its spans are documented as upserts by `ai.session_id`.) Giving usage spans one is a receiver protocol change. So: hold, do not re-key. Every input to the reconciliation is written during the session, so a session quiet for 24 hours cannot reconcile further and its first send is also its last word. The whole session is held, not just its residual — holding the residual alone still ships a row whose pairing can flip. Nothing is dropped: `held` is reported by --dry-run and by the nothing-to-push line, and the next push after the window sends it. Scoped by provider because copilot is the only reconciling producer; every other provider's calls go out unchanged and undelayed. |
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| design | ||
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| architecture.md | ||
| optimize.md | ||