F1 [BLOCKER] persistence-store.spec used Array.prototype.at(-1) (ES2022) but the
server targets ES2021, so server tsc failed (TS2550) and ts-jest could not
compile the suite — 22 core manual-save/idle/boundary tests silently did not run
in CI. Replaced with [length - 1] index access.
F2 [WARNING] The idle burst-reset used a hardcoded IDLE_MAX_WAIT_USER for both
tiers, but computeHistoryJob's ceiling is source-specific. On a continuously
agent-edited page the burst marker stayed stale for 5..10m, forcing delay=0 on
every store and writing one idle row per store — the exact per-store bloat the
debounce prevents. The reset now uses the same source-specific max-wait.
F3 [WARNING] The processor did an unlocked findPageLastHistory -> saveHistory,
which TOCTOU-races a concurrent manual-save (that runs under a page-row lock),
producing two page_history rows with identical content (one idle, one manual) and
defeating promote-not-dup. The snapshot decision is now wrapped in executeTx with
the same page-row lock, so the second writer observes the first's committed row
and the isDeepStrictEqual gate collapses the duplicate.
F4 [WARNING] The risky client filtered-index -> full-list mapping had no tests.
Extracted it to a pure resolvePrevSnapshotId(fullItems, id) helper (diff/restore
baseline against the true previous snapshot in the FULL list, never the previous
visible version) and unit-tested it; removed the now-vestigial index threading.
F5/F6 [low] Renamed the misleading ceiling test + fixed its comment; added a
CHANGELOG entry for the user-facing versioning feature.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
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