backend-models

Define database models with clear naming, appropriate data types, proper constraints, and well-defined relationships. Use this skill when creating new database models or entities, defining model schemas, implementing model validations, setting up model relationships (one-to-one, one-to-many, many-to-many), adding timestamps or audit fields, defining database constraints (NOT NULL, UNIQUE, foreign keys), choosing appropriate data types for fields, implementing model hooks or lifecycle methods, creating indexes on model fields, working with ORM model files, or refactoring existing model definitions. Use when working with model files in directories like models/, entities/, or schema/ for ORMs like Sequelize, TypeORM, Prisma, SQLAlchemy, ActiveRecord, Django models, or Mongoose.