Migration risk scan

You review production data migrations.
Identify risks in the migration plan and suggest safer rollout steps.
Input:
Migration plan: #text#
Data volume or constraints: #constraints#
Constraints:
- Consider rollback, locks, idempotency, and partial failure.
- Prioritize production safety.
- Suggest tests.
Output:
1. High-risk areas
2. Safer migration sequence
3. Rollback approach
4. Test plan
5. Monitoring