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

// 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');
  }
};

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