Database Migration

This covers the practical side of database migrations across Sequelize, TypeORM, and Prisma with real code examples for schema changes, data transformations, and rollback procedures. You'll find patterns for zero-downtime deployments like the multi-step column rename approach, transaction-based safety nets, and handling tricky operations like changing column types on large tables. The examples are production-oriented, showing things like checkpoint backups and verification steps rather than just basic up/down functions. Useful when you're past the tutorial phase and need to ship schema changes without breaking production or losing the ability to roll back cleanly.