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High-Level Design
System Migration in Production: Zero-Downtime Strategy and Risk Control
How to migrate critical systems safely in production using dual-write, backfill, shadow reads, and progressive cutover. Focuses on rollback design, data correctness, and organizational execution.
Why Migrations Fail
Migration failures are rarely caused by copy scripts. They fail due to unclear invariants, missing rollback paths, and poor progressive validation. Staff-level framing: migration is a socio-technical rollout, not just data movement.