عرض عملي: إعادة تسمية عمود أثناء حركة مرور حية

خطوة بخطوة

1. Start a load test hitting customer endpoints; baseline error count is zero.
2. Release 1: Flyway adds full_name (nullable); app writes both columns, reads name.
3. Run the batched backfill; verify with a count of rows where the columns differ.
4. Release 2: app reads full_name and still writes both.
5. Planned mistake: run ALTER TABLE ... RENAME COLUMN directly; the load test shows errors from old instances. Show it, restore, and continue with the safe path.
6. Release 3: stop writing name; later Release 4 drops it. The load test reports zero failures.

Prepares MID-020-LAB1.

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