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Cron Job Reliability Best Practices

Production cron is boring when done right: idempotent scripts, explicit logging, timeouts, and monitoring that does not depend on humans reading mailbox spool.

Idempotency

Assume reruns. Partial writes, duplicate charges, and double emails happen when jobs retry. Design for safe replays.

Timeouts and resources

Bound external calls. A stuck API should not hold a worker forever — use timeout wrappers or client-side limits.

Monitoring

Use heartbeats or equivalent external confirmation. Details: how to monitor cron jobs and silent failures.

Documentation

Every cron line should map to an owner, purpose, and on-call expectation in your runbook. Future you will not remember why 0 3 * * 0 exists.