KITFORMA · EDITORIAL ANSWER
Why can rolling back application code fail after a database migration?
KitForma editorial guide. The old binary may no longer understand a schema changed by the new release. A code rollback and a data rollback are different operations.
Step-by-step answer
The old binary may no longer understand a schema changed by the new release. A code rollback and a data rollback are different operations.
Design compatible migration stages and state which application versions support each intermediate schema. Test rollback with realistic migrated data before release. Prefer forward repair when reversing a migration would lose user changes. Do not automatically restore an old database backup over new production writes merely to match old code. Record the deployed image, migration state and recovery decision together so rollback is an executable plan rather than a button with hidden assumptions.
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