database-migration

Zero-downtime database migrations with Alembic use strategies like Expand-Contract and Blue-Green to apply schema changes without live impact. This workflow enforces versioned scripts, staging validation, and rollback procedures to ensure predictable deployments.

Testing SQL migrations involves applying scripts in local and production-like staging environments to verify data integrity before deployment. This workflow enforces a testing discipline that validates forward migrations and rollback capabilities against production-like data.

You can roll back an Alembic migration using built-in rollback capabilities provided by versioned migration scripts. The workflow ensures backward compatibility by defining and testing rollback procedures in staging environments before production deployment.

The Expand-Contract pattern for zero-downtime schema changes minimizes live impact by separating deployment into backward-compatible phases. This workflow uses Expand-Contract and Blue-Green strategies to ensure smooth transitions and predictable deployments.

Generating Alembic migration scripts uses the autogenerate command to create versioned files for schema changes. The workflow requires reviewing the generated script in the versions directory and validating results in a staging environment before deployment.