The death-spiral amplifier: pruneStatusLog ran a whole-table ROW_NUMBER() sort,
40-48s synchronous on the 1.1M-row incident table, freezing boot -> healthcheck
fail -> restart loop.
- lib/chunked-prune.js: shared chunkedDelete (rowid IN (SELECT ... LIMIT ?) since
better-sqlite3 has no DELETE...LIMIT) — bounded batch + setImmediate yield between
batches, optional band-gate. Core invariant: no sync op blocks >~50ms ever.
- pruneStatusLog: rewritten per-device via a loose index-scan seek
(WHERE device_id > ? ORDER BY device_id LIMIT 1 — O(log n) each), retention +
newest-cap trimmed in bounded batches, async, re-entrancy-guarded, band-gated on
the interval / un-gated + fire-and-forget at startup so a bloated table self-heals
on deploy WITHOUT freezing boot.
- heartbeat.js: maintenance moved off the interval body into async band-gated
re-entrant runMaintenance(); play_logs + provisioning prunes chunked; offline-marking
stays synchronous.
- pruneTelemetry: bounded single statement (OFFSET 6000 LIMIT batch), stays sync.
- idx_devices_provisioning so the provisioning prune batch subquery is an index range.
Tests: correctness (per-device cap + retention, independent devices), 300k-row backlog
trims in many batches with max event-loop gap <250ms, band-gate no-op while critical +
startup runs regardless, re-entrancy (concurrent -> once). Existing prune tests updated
to await. Suite 247/247.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The per-device insert-time prune (deviceSocket.js) only ever touches a device
that is actively inserting, so it misses two paths: removed/idle devices whose
rows linger forever, and heartbeat.js's offline_timeout insert that bypasses
logDeviceStatus entirely. The reporter's 1.2M-row bloat accumulated UNDER a 7-day
per-device prune for exactly this reason.
- pruneStatusLog() (db/database.js): a GLOBAL time-range sweep across ALL devices,
modeled on the play_logs prune. Run once on startup (recovers a bloated table
right after deploy) and on the heartbeat interval (services/heartbeat.js).
- STATUS_LOG_RETENTION_DAYS env, default 3 (lower than the old hardcoded 7d; the
dashboard only shows a 24h uptime window, so 2-3d is ample for diagnostics).
- Deliberately NO per-device row cap: Step 3's throttle already bounds how fast a
storming device can generate status rows, so a cap would add sweep complexity
for little gain (noted for later if needed).
- NO VACUUM / auto_vacuum here (kept off the hot path); space reclaim is left as a
separate decision (see report).
test: deterministic in-process unit test proves the sweep deletes over-retention
rows across all devices — including a device absent from the devices table and an
offline_timeout row — while keeping recent rows; idempotent on an empty table.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
