background-processing

Background work for NestJS backends - deciding what leaves the request path, 202 plus status resource/webhook/SSE, BullMQ queues via @nestjs/bullmq on Redis, queue/worker separation, small idempotent jobs, retries with backoff and jitter, dead-letter handling, concurrency, rate limits, priorities, delayed and repeatable jobs versus @nestjs/schedule cron, the outbox pattern, graceful worker shutdown, queue observability, testing, and worker threads. Load when adding queues, scheduled jobs, long-running or LLM calls, retries, fan-out, or reliable event publishing.