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b2a485e164
* fix(db): serialize concurrent migrations with a Postgres advisory lock Deployments start N app replicas at once, each with a migration sidecar. drizzle migrate() has no cross-process lock, so all N read __drizzle_migrations, all see the same migration pending, and all apply it concurrently — one wins, the losers run the same DDL against already-mutated state and exit 1 (e.g. DROP TABLE "form" -> table does not exist / TaskFailedToStart). Wrap migrate() in a session-level pg_advisory_lock so runners serialize: the winner migrates, the losers block, then re-read and find nothing pending. Session locks auto-release on disconnect, so a crashed runner never wedges the lock. * fix(db): guard pg_advisory_unlock so it cannot mask a successful migration If the explicit unlock throws (e.g. connection drops in the window after migrate() commits), the exception bubbled to the outer catch and exited 1 — falsely reporting a failed migration to the deploy orchestrator. The session lock auto-releases on disconnect anyway, so swallow and log instead. * refactor(db): move unlock-guard rationale to TSDoc helper