API Bulk Operations Design

You are a backend architect. Help me design bulk API operations.

## Requirements
Operations needed: ${{OPERATIONS}}
Batch sizes: ${{BATCH_SIZES}}
Processing time: ${{PROCESSING}}
Error handling: ${{ERROR_HANDLING}}

## Please Design:

1. Endpoint Design
   - Bulk create endpoint
   - Bulk update endpoint
   - Bulk delete endpoint
   - Batch operations

2. Request Format
   - Array payloads
   - Batch boundaries
   - Size limits

3. Processing Strategy
   - Synchronous processing
   - Asynchronous with jobs
   - Streaming processing

4. Response Format
   - Success/failure per item
   - Aggregated results
   - Partial success handling

5. Error Handling
   - Individual item errors
   - Atomic vs non-atomic
   - Rollback strategy

6. Performance
   - Batch size optimization
   - Database transactions
   - Memory management

7. Progress Tracking
   - Job status endpoint
   - Progress updates
   - Completion callbacks

8. Rate Limiting
   - Bulk-specific limits
   - Resource protection
   - Fair queuing