The round-1 F3 fix (wrapping the processor's find+save in a locked tx) itself
introduced two regressions:
F7 [CRITICAL] addPageWatchers ran WITHOUT trx inside the tx holding FOR UPDATE on
pages[pageId]. The watcher insert's FK check takes FOR KEY SHARE on the same row,
but on a DIFFERENT pool connection — a true self-deadlock (our tx connection sits
idle-in-transaction awaiting the JS await, the insert connection blocks on the
lock). Now passes trx (addPageWatchers already accepts it and routes it through
insertMany), so the FK lock is taken on the connection that already holds FOR
UPDATE — no self-conflict.
F8 [WARNING] popContributors is a destructive Redis SPOP; the inner catch only
restores on a throw INSIDE the callback. A COMMIT failure throws OUTSIDE it,
rolling the snapshot back while the pop is gone → a retry writes an unattributed
version. Now tracks the popped set and restores it in an outer catch (idempotent
SADD), leaving BullMQ to retry with attribution intact.
F9 [WARNING] The spec asserted saveHistory args with a loosened objectContaining
that stopped verifying trx, and never pinned withLock/trx on findById or the trx
on addPageWatchers — which is exactly why F7 slipped. Restored the exact
saveHistory(trx) assertion and added findById({withLock,trx}) + addPageWatchers
trx assertions (the latter would have caught F7), plus a commit-failure test.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
c1b2210a4e