Choose the decision supported by the recorded packet.
Lessons
- Backfill prompts: pin source, target, and snapshot
- Backfill prompts: map known states and quarantine unknowns
- Backfill prompts: bound batches and make retries idempotent
- Backfill prompts: account for writes during migration
- Backfill prompts: compare count and field-level parity
- Backfill prompts: hold cutover until fallback is rehearsed