Adds the scan-critical-payment-logs job (daily 2:45am) that surfaces stale pending payments/till-sales and refunds at the retry cap as admin_notifications with reason='critical_payment_log' — the app has no log/alert pipeline (Gap Backlog T14), so money events that would otherwise sit in un-watched CRITICAL log lines now reach the owner's in-app notification centre. Dedup is NULL-safe (IS NOT DISTINCT FROM) and re-surfaces acknowledged-but-still-unresolved rows. Stopgap until a real alerting pipeline lands.
square_webhook_events is now CREATE TABLE IF NOT EXISTS, registered as the 24th maintenance job (sweep-square-webhook-events, daily 2:30am) pruning rows older than 90 days, and testdb gives a clear docker compose hint when the admin DB connection fails.
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