The on-device search index grew unbounded over a long session. putRows now
prunes each touched room to MAX_ROWS_PER_ROOM (5000) — deleting the oldest rows
by [roomId, ts] via a self-chaining IDB cursor within the same write tx (never
awaits a non-IDB promise mid-tx, so the transaction can't auto-commit and
truncate the prune). Exposed a pure, unit-tested evictCount() for the decision;
the cursor path itself is browser-only (node --test has no IndexedDB).
Deliberate tradeoff (documented in code): the coverage window keeps claiming the
evicted tail so the search doesn't re-fetch → re-evict it forever. Net effect —
in a room past 5000 cached rows, an evicted old message is silently unsearchable
rather than churning. Clear cached index / logout still wipe everything.
Two review agents verified the IndexedDB-spec correctness (cursor delete+continue
semantics, put-then-count ordering, roomRange bracketing with no prefix bleed,
tx liveness, abort→cache-miss) since CI can't. Gate-green (tsc, eslint, prettier,
925 tests, build).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jaredandClaude Opus 4.8
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