Umzug v3 — Claude Skill (Sequelize v7 Adapted)

Key Concepts

• Umzug is not an ORM — it orchestrates running/reverting migration functions and tracking which have been executed
• The context option passes any value to every migration's up/down — for Sequelize, use sequelize.getQueryInterface()
• SequelizeStorage tracks executed migrations in a database table (SequelizeMeta by default)
• Migrations are discovered via glob patterns or provided as an inline array
• Built-in CLI via umzug.runAsCLI() — supports up, down, pending, executed, create
• Import from 'umzug': Umzug, SequelizeStorage, JSONStorage, MongoDBStorage, memoryStorage, MigrationError

Sequelize v7 Specifics

• Import Sequelize from @sequelize/core (not sequelize)
• Import dialect classes: PostgresDialect, SqliteDialect, MysqlDialect, etc.
• DataTypes from @sequelize/core for migration column definitions
• Sequelize v7 constructor takes a single options object (no URL string as first arg)
• CLS transactions enabled by default — use sequelize.transaction() for managed, sequelize.startUnmanagedTransaction() for unmanaged
• dialectOptions removed — settings go in top-level options