API Batch Operations Design

Design batch operations for:

API Type: [REST/GraphQL]
Framework: [Express/FastAPI/etc.]
Operations Needed:
- Batch create: [YES/NO]
- Batch update: [YES/NO]
- Batch delete: [YES/NO]

Requirements:
- Max batch size: [NUMBER]
- Partial failure handling: [ALL-OR-NOTHING/PARTIAL]
- Progress reporting: [YES/NO]
- Async processing: [YES/NO]

Please provide:
1. Batch endpoint design
2. Request/response format
3. Transaction handling
4. Partial failure response format
5. Rate limiting considerations
6. Large batch async processing