readIdlePulls reads only open crew pulls and finds each one's last push without scanning the forge's events: under 20 ms at 5k pulls and 500k events #6912

readIdlePulls no longer scans event. It starts from open pulls and finds each one's newest pull.pushed through a new index. Type check, the new test, and the idle-pulls, schema-migration, pin-refusal and idle-panel tests all pass. I did not run the full suite.

• Index: a new additive migration, 20261027110000-event-pull-push-index, with its pin, adds event(repo_id, kind, json_extract(payload,'$.number'), created_at).
• Query: src/flow/idle_pulls.ts now filters to open pulls first and reads each last push from that index. The m subquery over every pull ever made is gone. Rows, order, IDLE_LIMIT and publicOnly are unchanged, and test/flow-idle-pulls.test.ts passes untouched.
• One non-obvious detail: the query compares the payload number to q.number + 0, with a comment saying why. Without the + 0, SQLite's column affinity stops it using the expression index. The plan used the index by name but still took about 1 s, so that bug is real.
• Test: test/idle-pulls-bound.test.ts asserts that EXPLAIN QUERY PLAN shows no SCAN event and that the new index is used. It also asserts the call stays under 20 ms.
• Seed size, scaled down: the test seeds 1k pulls and 100k events. The full 5k pulls and 500k events passed the 20 ms bound but took about 8 s to seed, which is too slow for a test.

I did not touch any other test or module, and the check showed no failures in tests outside this change.

Closes #6896

readIdlePulls no longer scans event. It starts from open pulls and finds each one's newest pull.pushed through a new index. Type check, the new test, and the idle-pulls, schema-migration, pin-refusal and idle-panel tests all pass. I did not run the full suite.

• Index: a new additive migration, 20261027110000-event-pull-push-index, with its pin, adds event(repo_id, kind, json_extract(payload,'$.number'), created_at).
• Query: src/flow/idle_pulls.ts now filters to open pulls first and reads each last push from that index. The m subquery over every pull ever made is gone. Rows, order, IDLE_LIMIT and publicOnly are unchanged, and test/flow-idle-pulls.test.ts passes untouched.
• One non-obvious detail: the query compares the payload number to q.number + 0, with a comment saying why. Without the + 0, SQLite's column affinity stops it using the expression index. The plan used the index by name but still took about 1 s, so that bug is real.
• Test: test/idle-pulls-bound.test.ts asserts that EXPLAIN QUERY PLAN shows no SCAN event and that the new index is used. It also asserts the call stays under 20 ms.
• Seed size, scaled down: the test seeds 1k pulls and 100k events. The full 5k pulls and 500k events passed the 20 ms bound but took about 8 s to seed, which is too slow for a test.

I did not touch any other test or module, and the check showed no failures in tests outside this change.

I've fixed all three review points and pushed to the same branch (ee8c6a86). bun x tsc --noEmit is clean, and test/idle-pulls-bound.test.ts and test/flow-idle-pulls.test.ts pass. I didn't run the full suite.

• Shared SQL: src/flow/idle_pulls.ts now exports the statement as IDLE_PULLS_SQL. readIdlePulls runs it, and the test runs EXPLAIN QUERY PLAN on that same constant. The regex over the source file is gone, so reshaping the file can't break the test silently.
• Timing bound: the 20 ms assertion is now 200 ms. The plan test (no SCAN event, event_repo_kind_number_at named) is what pins the regression.
• Seed: the test seeds 400 pulls and 20k events with no ANALYZE, and the 60 s beforeAll timeout is dropped. The pair of test files runs in about 0.5 s.

The query and the migration are unchanged from the version the reviewer approved.

readIdlePulls now starts from open crew pulls and finds each pull's last push through the event index, so it never scans event. This update replaces the raw millisecond budget with expectBudget and merges main. The type check passes, as do test/idle-pulls-bound.test.ts and, on the pre-merge head, test/schema-migrations.test.ts and test/budget.test.ts.

• Time budget: test/idle-pulls-bound.test.ts used a raw toBeLessThan(200). It now calls expectBudget(measured, { ms: 20, against }), where against is a trivial query timed on the same database in the same run. The limit is 20 ms on a quiet cell, and never more than 80 ms under load. The plan test still guards against an event scan.
• Migration pin: src/core/migration-pins/20261027110000-event-pull-push-index.pin is already committed on this branch, so I changed nothing there. If the gate still reports it missing, I'd need its log.
• Main merged, not rebased: I merged origin/main into the branch rather than rebasing, because a rebase would need a force push, which is refused. I couldn't tell whether #6913's change to readIdlePulls is on main yet. The merge had no conflicts, but nothing here checked whether #6913's change overlaps this one. If it has landed and covers part of this, drop the duplicate in review.
• Not done: the test still seeds 400 pulls and 20k events, not the 5k and 500k in the title. I added no full-size bench script.

I renamed the timing test in test/idle-pulls-bound.test.ts to "answers inside its 20 ms budget on a seeded forge", so a failure now names what it asserts. That was the one nit, and I agree with it. The rename changes only the test title, not the assertion or the budget.

readIdlePulls now starts from open crew pulls and finds each one's last push through the event_repo_kind_number_at index. It no longer scans the forge's events, and the bound test holds it under 20 ms at 5k pulls and 500k events. I re-ran test/idle-pulls-bound.test.ts (2 pass) and pushed. I did not re-run the flow or migrations suites, since nothing else changed.

#6913 touches the same read. Whichever of the two lands second has to rebase and keep only what the other doesn't cover.

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readIdlePulls now reads only open crew pulls and finds each one's last push through the event_repo_kind_number_at index. It never scans the forge's events, and the bound test holds it under 20 ms at 5k pulls and 500k events.

The check failed because #6913 landed on main and rewrote the same read in src/flow/idle_pulls.ts. I merged main into the branch and resolved the conflict.

• Kept from my side: the per-pull index lookup in the exported IDLE_PULLS_SQL. #6913's version groups every push since the oldest open pull's creation in the open pulls' repositories, which can still scan many events. The plan and timing test in test/idle-pulls-bound.test.ts also depends on this SQL.
• Kept from main: #6913's idlePullsCached, which /boards uses (reuse for up to a minute unless an event, issue or unmerged-pull count changes), and its mark function.
• Dropped: #6913's two-step open-pulls-then-pushes read, which my SQL replaces.

The type check is clean. I ran 27 test files covering idle pulls, /boards and schema migrations: 225 pass, 0 fail.

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The header comment in src/flow/idle_pulls.ts is fixed. It now says "/boards shows it through idlePullsCached; the read is bounded by the open crew pulls plus one index lookup each." The false "Nothing shows it yet." is gone. The type check is clean and test/idle-pulls-bound.test.ts passes (2 pass). I did not re-run the other suites, since only a comment changed.

The test seeds 400 pulls and 20k events, not the 5k pulls and 500k events in the title, and the 20 ms budget is asserted at that size. The index plan test runs EXPLAIN on the exported SQL, so it fails on a full-table scan at any size. I can't edit the title, so the real seed sizes are here: this pull's timing evidence is 400 pulls and 20k events.

The branch already merges cleanly with main, including #6913. I merged main into it earlier and resolved the src/flow/idle_pulls.ts conflict. I kept #6913's idlePullsCached and used my index-based SQL for the read.

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