Plan a data migration from {old_system} to {new_system}.
SCALE: {n_records, total_size}
DOWNTIME TOLERATED: {minutes / zero}
DATA SHAPE DIFFERENCES: {key_schema_deltas}
BUSINESS CONSTRAINTS: {compliance / frozen_period / customer_communication}
DESIGN:
1. **Approach**: big-bang / dual-write / strangler / shadow-read — pick one with reasoning
2. **Phases**: pre-migration backfill, cutover, verification, rollback window — with durations
3. **The verification queries** (3-5 SQL/data queries that prove correctness post-cutover)
4. **The rollback plan** (what triggers it, how it works, max time to restore)
5. **Risks ranked**, mitigations attached
6. **The customer comms plan** (what we tell them, when)
7. **The dry-run plan** before we touch prod
End with the 'go/no-go checklist' — 8 items the on-call must confirm before pressing the button.0 copies·0 saves·2 views
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