Python Data Validation with Pydantic

Create Pydantic models for: [DESCRIBE YOUR DATA]

Data to validate:
```json
[PASTE SAMPLE JSON]
```

Validation requirements:
- Required fields: [LIST]
- Optional fields: [LIST]
- Custom validations: [DESCRIBE RULES]
- Nested objects: [YES/NO]

Provide:
1. Pydantic model definitions
2. Field types and constraints
3. Custom validators (@validator)
4. Root validators
5. Pre/post validators
6. Optional and default values
7. Nested model handling
8. Generic models
9. Model inheritance
10. JSON schema generation
11. Serialization options
12. Error handling and messages
13. Performance optimization