Deployment Rollback Gets Complicated When the Database Has Moved On

<p>“Just roll it back.”</p> <p>A beautiful sentence. Four words. Very relaxing.</p> <p>Then someone asks whether the previous application still understands the new database schema, and suddenly everyone's tea is going cold.</p> <p><strong>Rolling back an application release is not necessarily the same as restoring the whole system to an earlier state.</strong> Writes, migrations, jobs and external

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