- SSE stream: detect client disconnect via request.signal to stop
polling loop (prevents wasted DB queries after tab close)
- AlertEvaluator: split shouldFire/recordFired so cooldown is only
recorded after successful dispatch (prevents alert suppression
on dispatch failure)
- SnapshotCollector: cache payload instance (avoid re-importing on
every 60s tick)
- Alert acknowledge: validate alertId type (string|number)
- Logs search: add 300ms debounce to prevent query-per-keystroke
- Replace remaining `any` cast with Record<string, unknown>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
