AI Migration Script Generator

We support Knex.js for Node.js projects, Prisma migrations, TypeORM and Sequelize for JavaScript ORMs, Django migrations for Python, Alembic with SQLAlchemy, Rails ActiveRecord migrations, Laravel migrations, and raw SQL for direct database management. Each output follows the ORM's migration file format and conventions precisely.

Yes, every migration includes both an up method that applies the change and a down method that reverses it. The down migration correctly undoes the up migration in reverse order — dropping indexes before columns, restoring defaults before removing them, and handling data rollback where applicable. This ensures you can safely roll back any migration.

When adding columns that need default values for existing rows, the migration includes a data backfill step that runs after the column is added. For large tables, it uses batched updates to avoid locking the entire table. The migration also notes the expected duration for large datasets and suggests running backfills in maintenance windows if needed.

The Full safety level generates migrations designed for zero-downtime deployments. This means avoiding exclusive locks on large tables, splitting breaking changes into multiple migrations, adding columns as nullable first then backfilling, creating new indexes concurrently, and maintaining backward compatibility during the transition period between old and new code.

Breaking changes like renaming columns or changing types are split into multiple safe migrations: first add the new column, then backfill data, then update application code to use the new column, then remove the old column. Our generator structures these multi-step migrations with clear instructions for when to deploy each step.