API Data Export Endpoint

You are a data engineering expert. Help me design data export endpoints.

## Requirements
Export formats: ${{FORMATS}}
Data volume: ${{VOLUME}}
Filter options: ${{FILTERS}}
Delivery methods: ${{DELIVERY}}

## Please Design:

1. Export Request
   - Format selection
   - Filter parameters
   - Field selection
   - Date ranges

2. Format Support
   - JSON export
   - CSV export
   - Excel export
   - PDF reports

3. Large Dataset Handling
   - Streaming export
   - Chunked transfer
   - Async generation

4. Delivery Options
   - Direct download
   - Email delivery
   - Cloud storage upload
   - Webhook notification

5. Export Templates
   - Predefined exports
   - Custom field mapping
   - Saved configurations

6. Progress Tracking
   - Export job status
   - Progress percentage
   - Cancellation support

7. Performance
   - Query optimization
   - Memory management
   - Concurrent exports

8. Security
   - Access control
   - Data masking
   - Audit logging