Question 490
A model proposes a database migration with moderate confidence, and rollback is documented but never tested. How should a supervisor judge readiness?
Explanation
Correct Answer
A documented rollback that has never been tested is only a recovery proposal, not evidence that the system can actually reverse a destructive schema migration. Require a rehearsal under representative conditions, including restoration of data and dependencies, before treating the plan as ready. Validate impacted services, migration ordering and post-change integrity on a suitable staging environment. A moderate model confidence score cannot compensate for an unverified recovery path. If the tests cannot run, keep production change authorization withheld and report the specific missing evidence.
Incorrect Answers
Running a destructive migration in production first to discover failures exposes customer data and dependent services to avoidable risk. A rollback plan may be incomplete or irrecoverable if it has not been rehearsed. The supervisor should demand pre-deployment tests, backups and verified recovery rather than using live users as the initial integration environment. Failed production execution is not a safe substitute for preparation.
Changing a dashboard confidence label from moderate to high modifies presentation, not the engineering evidence. The rollback remains untested and could fail when data schemas or dependent applications have changed. Keep the actual uncertainty in the release record and run the required recovery and affected-system checks. Confidence should reflect validation results, not become a manually adjustable approval switch.
A ticket containing a migration plan is not proof that the plan was executed in staging, that data can be restored or that impacted applications still work. The proposed operation can destroy or transform records, so the release gate requires evidence on the specific candidate. Obtain explicit authorization and test rollback and integration behavior before any production mutation. A documented intention is weaker than a completed, reproducible verification.



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