ORM Model Generator

Generate ORM models from this database schema:

**Database Schema:**
```sql
{{DATABASE_SCHEMA}}
```

**ORM Framework:** {{ORM_FRAMEWORK}}
**Programming Language:** {{PROGRAMMING_LANGUAGE}}
**Additional Requirements:** {{ADDITIONAL_REQUIREMENTS}}

Please provide:
1. Complete ORM model definitions
2. Relationship mappings (one-to-one, one-to-many, many-to-many)
3. Validation rules
4. Custom methods for common operations
5. Migration files if applicable
6. Repository/DAO pattern implementation
7. Example CRUD operations using the models
8. Query builder examples for complex queries