fix(server): preserve latest turn after session completion

[sungsoo-han]

Before:

Completed threads briefly lost their latest turn reference, causing Settle to incorrectly report that work was still pending.

After:

Completed threads preserve their latest turn reference when the session becomes ready, allowing them to settle immediately.

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Note

Low Risk
Single-field fallback in one projection handler with a targeted regression test; no auth or broad API changes.

Overview
Fixes projection_threads.latest_turn_id being cleared when a thread’s session moves to a non-running state (e.g. ready) with no activeTurnId.

On thread.session-set, the threads projector no longer overwrites latestTurnId with a nullish activeTurnId; it keeps the existing value instead. That stops completed threads from briefly losing their last turn reference, which had caused Settle to treat work as still pending.

A projection test now asserts latest_turn_id stays set after the session leaves running and the turn is marked completed.

^{Reviewed by Cursor Bugbot for commit da525fb. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix projection_threads.latest_turn_id to preserve value on session completion

In the thread.session-set event handler in ProjectionPipeline.ts, latestTurnId was unconditionally set to event.payload.session.activeTurnId, which could overwrite the stored value with null or undefined when the session ended. It now falls back to existingRow.value.latestTurnId when activeTurnId is absent.

^{Macroscope summarized da525fb.}

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[macroscopeapp]

Approvability

Verdict: Approved 9d15f0d

Straightforward bug fix that adds a nullish coalescing fallback to preserve latestTurnId when activeTurnId is null during session completion. Clear intent, limited scope, includes test coverage.

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