AlertInstanceRepository gains listFiringDueForReNotify(Instant) — only returns
instances where last_notified_at IS NOT NULL and cadence has elapsed (IS NULL
branch excluded: sweep only re-notifies, initial notify is the dispatcher's job).
AlertEvaluatorJob.sweepReNotify() runs at the end of each tick, enqueues fresh
notifications for eligible instances and stamps last_notified_at.
NotificationDispatchJob stamps last_notified_at on the alert_instance when a
notification is DELIVERED, providing the anchor timestamp for cadence checks.
PostgresAlertInstanceRepositoryIT adds listFiringDueForReNotify test covering
the three-rule eligibility matrix (never-notified, long-ago, recent).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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