backend-models

Define and structure database models with clear naming conventions, timestamps, data integrity constraints, appropriate data types, and relationship definitions. Use this skill when creating or modifying database model files in directories like models/, entities/, schemas/, src/models/, app/models/, or any ORM model definition folders. Use this when defining model classes with ORMs like Sequelize, TypeORM, Prisma schema, Django ORM models, Rails ActiveRecord models, SQLAlchemy models, Mongoose schemas, or any database ORM framework, adding or modifying database constraints like NOT NULL, UNIQUE, CHECK constraints, or foreign key relationships to enforce data integrity at the database level, defining model relationships such as hasMany, belongsTo, hasOne, belongsToMany, ManyToMany, or OneToMany associations between entities to represent how data is connected, implementing validation rules at the model layer for data integrity including required fields, format validation, and custom business rule validation, ch

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