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How to Create, Test and Validate a Cron Job Correctly (Complete Guide)

I've seen it happen more times than I'd like to admit — a cron job that looked perfectly fine in development quietly fails in production, burning through server resources, missing database backups, or sending thousands of duplicate emails before anyone notices. The problem usually isn't the task itself. It's the setup, the syntax, or the lack of meaningful validation before the job goes live.