Webhook handling and background job scheduling for backend services
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See how to installReview the instructions the agent will receive before you install.
Stack: Fastify + Prisma + PostgreSQL + Redis + BullMQ + Zod + TypeScript.
Flow: receive -> verify signature -> deduplicate -> enqueue -> respond 200 (< 2s). All processing async via queue.
Signature: use provider SDK when available. Custom: HMAC-SHA256 over timestamp.body. Require raw body access (verify before parsing). Always include timestamp in signed material.
Anti-replay: reject if timestamp differs from server time by > 5 minutes.
Idempotency: Redis SETNX with event ID as key, 7-day TTL. If exists, return 200 already_processed.
Transactional outbox pattern + HMAC signature + exponential backoff retry + DLQ.
→ Read references/outbound-webhooks.md for outbox pattern, payload format, retry schedule, subscriber management y SSRF prevention
BullMQ + Redis default. Queues separated by criticality. Jobs idempotent with timeout.
→ Read references/job-scheduling.md for queue technology selection, job design principles, retry, scheduling, concurrency y graceful shutdown
Idempotency: unique event/job ID as dedup key (Redis SETNX or BullMQ jobId). Pass idempotency keys to external providers. Check entity state before side effects.
Dead Letter Handling: store in DLQ table / BullMQ failed set. Alert on growth. Dashboard for inspection + replay. 30-day retention. Auto-disable sustained failures.
Observability: metrics for webhook_{inbound,outbound}_total, webhook_{outbox_pending,dlq_depth}, job_{enqueued,completed}_total, job_duration_seconds, queue_depth{state}. Propagate traceId in payloads. Structured logs with event_id, job_id, queue.
Alerts: rising queue/outbox depth (throughput insufficient), DLQ growth > N/min (systemic), subscriber failure > 5% (endpoint down), failed jobs/min > threshold (page on-call).
→ Read references/anti-patterns.md for lista completa (14 items)
→ Read references/checklist.md for checklist completo (8 items)
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