How do you test an AI-generated data migration on a copy and verify recovery?

Define data changes and acceptable downtime

This applies to renaming fields, converting types and bulk backfills while preserving existing data. Establish database engine, version and migration tool, including potential long table locks. Backups need a consistent recoverable state; an arbitrary copy of live database files is not necessarily valid. A local copy is not an off-machine disaster-recovery backup.

Restore the backup in an independent environment

Inspect deletion, defaults and null handling, especially irreversible information loss. Separate transactionally reversible database operations from external writes and do not assume all DDL shares transaction semantics. Restore into another instance and verify readable schemas and key records, then check required versions, permissions and recovery order.

Rehearse migration and interruption on a data copy

Use a sanitized copy retaining structural characteristics, execute the planned migration and simulate interruption only in isolation. Check repeated execution and whether failure requires transaction rollback or backup restoration. Preserve executable recovery instructions and required backups before production. AI authorship does not authorize otherwise unapproved production-data deletion.

Check business invariants and execute recovery steps

Check not just row counts but unique keys, amounts, other business constraints and application reads and writes. Recovery rehearsal must show that the old application can access restored data and record elapsed time. Evidence from both copy testing and recovery is needed before the formal process. A successful backup exit code or existing rollback file is insufficient.

This article changed no database or rehearsed real production recovery. Backup consistency and transaction limits vary by engine and version; SQLite and PostgreSQL methods are not interchangeable. Stop formal migration if backup verification or irreversible impact is unclear and complete recovery preparation. A local no-error run does not replace authorization or validation.