database-change-management

Safe column addition uses reversible migrations with nullable fields, chunked backfills, and a separate migration to enforce constraints. Plan the migration, run it in staging, verify with rollback and re-migrate, then deploy with tests.

Chunked backfills process data in batches to avoid memory overload and locking. Use Eloquent's chunked update pattern within a migration or separate script, then verify data integrity before applying non-null constraints.

Indexing migrations should be reversible with down() methods and tested in staging first. Plan index creation alongside schema changes, verify performance impact, and document the deployment order for zero-downtime application.

Reversible migrations enable rollback if deployment fails, allowing quick recovery without data loss. The mandatory verify loop—migrate, rollback, migrate, test—ensures migrations work both forward and backward before production deployment.

Yes. Migration patterns cover relationship adjustments and model documentation updates alongside schema changes. Backfill scripts use Eloquent for chunked updates, keeping your ORM layer consistent throughout the migration process.

Document all required backfills, enforce deployment order, use staging verification loops, and plan zero-downtime strategies for large tables. Reversible migrations with comprehensive testing catch issues before production impact.