Schemachangesarewhereproductionincidentshide.Thisplaybookkeepsreleasessafewhileyourdatamodelevolves.
Zero-downtime migrations are a sequence of small, reversible steps — not one big ALTER on Friday evening.
Add new columns as nullable, backfill in batches, deploy code that reads both paths, then remove the old path once traffic proves safe.
Treat migrations like product releases: measurable, observable, and owned end-to-end.
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