database-migration

# Database Migration Master database schema and data migrations across ORMs (Sequelize, TypeORM, Prisma), including rollback strategies and zero-downtime deployments. ## Do not use this skill when - The task is unrelated to database migration - You need a different domain or tool outside this scope ## Instructions - Clarify goals, constraints, and required inputs. - Apply relevant best practices and validate outcomes. - Provide actionable steps and verification. - If detailed examples are required, open `resources/implementation-playbook.md`. ## Use this skill when - Migrating between different ORMs - Performing schema transformations - Moving data between databases - Implementing rollback procedures - Zero-downtime deployments - Database version upgrades - Data model refactoring ## ORM Migrations ### Sequelize Migrations ```javascript // migrations/20231201-create-users.js module.exports = { up: async (queryInterface, Sequelize) => { await queryInterface.createTable('users', { id: { type: Sequelize.INTEGER, primaryKey: true, autoIncrement: true }, email: { type: Sequelize.STRING, unique: true, allowNull: false }, createdAt: Sequelize.DATE, updatedAt: Sequelize.DATE }); }, down: async (queryInterface, Sequelize) => { await queryInterface.dropTable('users'); } }; // Run: npx sequelize-cli db:migrate // Rollback: npx sequelize-cli db:migrate:undo ``` ### TypeORM M...