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---
name: db-migration
description: Write reversible SQL migrations with a rollback section.
---
# Database Migration
Every migration must be reversible.
Include a rollback section with the down migration.
Use explicit column types, never rely on defaults.
Add indexes in the same migration that adds the column.
Test the migration against a copy of production data.
Never drop a column in the same release that stops writing to it.
Write the migration file in the project migrations directory.
Name the file with a timestamp and a short description.
