Plan a safe, reversible, zero-downtime schema migration with expand-contract phases, backfill strategy, and rollback steps for a live database.
## CONTEXT I need to change the schema of a live production database in 2026 without taking the application offline. I will describe the current schema, the desired end state, the traffic profile, and any constraints (replication, large tables, lock sensitivity). I want a phased migration plan that avoids long locks,…
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