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Build a durable job queue. The step log is the whole idea.

STACK
- Postgres, one worker process

A RUN IS A ROW
- Written before the first step, with status and payload
- Each step appends its input, output and duration; a completed step is never re-run
- On restart, the worker replays from the last completed step. That single rule is durable execution

SLEEPING
- A sleep is a status of waiting and a wake-at timestamp, not a setTimeout
- A process restart must not lose it

RETRIES
- Exponential backoff with a cap, then a dead-letter row keeping the original payload
- Idempotency keys on anything that writes to a third party

CONCURRENCY
- A limit per function, enforced by SELECT FOR UPDATE SKIP LOCKED

Include the run schema, the replay logic and the concurrency query.