plan.md

1. Create ContractEventDlq Entity: Add the requested fields.
2. Update Event Persistence: In ContractEventIndexerJob, capture failures (and in IndexerService if applicable, though the problem describes ContractEventIndexerJob having events) and save them to DLQ instead of failing the batch.
3. Implement Retry Worker: Create a cron job that finds pending/retrying DLQ entries, attempts to re-process them, updates attempts and next retry time with exponential backoff. Status changes to exhausted after max attempts.
4. Idempotency Guard: Replay should successfully insert into ContractEvent using orIgnore, and update the DLQ record status to resolved.
5. Operator Endpoint: Add endpoints in an existing controller (e.g., AdminController) or a new controller to list DLQ records and trigger manual replay.
6. Pre-commit Checks: Run tests, linter, formatting.