RELAY/LABConnecting

01 / RELIABILITY ENGINEERING

Delivery
under failure.

Run an event through a durable queue. Watch two workers compete for jobs, retry failed deliveries, and recover abandoned work.

SQLite WAL2 workersAt-least-once attempts
FIG. 01 / DELIVERY PIPELINELIVE
  1. 01Request ingressIdempotency check
  2. 02Durable queue—
  3. 03Worker pool—
  4. 04Consumer outcome—

02 / SCENARIO CONTROLS

Inject an event

Ready for a scenario.

Backend inspector

SQLite stores the job and its event together. A worker claims the job with a five-second lease, and an expired lease lets another claim recover it.

POST /api/jobs
Run a scenario to see the HTTP response.
Latest queue event
Waiting for queue data.

03 / OBSERVABILITY

Queue and event log

Recent jobs

    Event log