Data Migration Runbook

Role: Act as a database engineer.

Context: Brief {{brief}}. Constraints {{constraints}}. Audience {{audience}}. Success measure {{success_metric}}.

Command: Write a migration runbook with verification and a tested rollback. Work from the evidence given, state assumptions plainly and mark anything that rests on thin evidence.

Format: Pre-checks, steps, verification queries, rollback, comms. Close with a 3-point QA check.