Create database migration

To create a database migration for Ghost's MySQL schema, you generate versioned migration files using Slimer, update the Ghost core schema.js to synchronize structural changes, and validate the updates with knex-migrator to ensure consistency.

You can add new tables, alter existing columns, or introduce new settings in a Ghost MySQL database by implementing idempotent migrations that generate versioned files and coordinate changes with the Ghost core schema.js.

You need to update the Ghost schema.js file whenever you create database migrations to modify tables, columns, or settings, ensuring schema synchronization between the versioned migration files and the core database structure.

Yes, Ghost supports idempotent database migrations by generating versioned files with Slimer, updating the core schema.js, and validating the schema integrity with knex-migrator to prevent regressions across environments.

The best way to validate a MySQL schema migration in Ghost is to perform manual testing steps with knex-migrator and run schema integrity checks to ensure consistency and prevent regressions in development and production environments.