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G12 Leak-Guard / leak-guard (pull_request) Successful in 6s
legal-halacha-drain crashed 29× with asyncpg DeadlockDetectedError. Root cause: every short-lived cron drain re-runs the idempotent schema migrations on startup (get_pool → _run_schema_migrations), and three jobs (metadata-drain, halacha-drain, halacha-supervisor) all fired on the same minute (*/15 / top-of-hour). Two processes running the DDL concurrently took AccessExclusiveLock in opposite order → Postgres killed one with a deadlock. Two-layer fix: - Root cause: wrap _run_schema_migrations in a session-level pg_advisory_lock so only one process applies DDL at a time; concurrent migrators wait instead of deadlocking. DDL body extracted to _apply_schema_ddl. Idempotent, schema unchanged. - Defence-in-depth: give each cron drain a distinct firing minute — metadata :00, supervisor :05, halacha-drain :10, digest :12, court-fetch :17 — so siblings no longer start at the same instant. SCRIPTS.md updated to match. Invariants: G1 (fix at source — the single migration path — not the symptom); G2 (no parallel control path introduced). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>