## New Features
- **New /api/updates endpoint**: Incremental fixture synchronization with optional timestamp filtering
  - Supports both GET (query params) and POST (JSON body) methods
  - Optional 'from' parameter for unix timestamp-based filtering
  - Returns fixtures updated after specified timestamp or last N fixtures
  - Includes ZIP download URLs in API response
  - Configurable default count via system settings

- **Fixture active time tracking**: Automatic timestamp management
  - Added fixture_active_time column (BigInteger, indexed) to matches table
  - Automatic timestamp setting when all matches in fixture become active
  - Preserves original activation time (no overwrites)

- **Hybrid authentication system**: Maximum compatibility
  - Supports JWT tokens (short-lived, from login) AND API tokens (long-lived, from web interface)
  - Tries JWT first, falls back to API tokens automatically
  - Multiple token header formats: Authorization Bearer, X-API-Token, query parameter

- **SHA1-based ZIP file naming**: Consistent file naming
  - Uses SHA1 hash of (unix_timestamp + original_filename)
  - Applied across all upload methods for consistency

## Technical Implementation
- **Database Migration_005**: Added fixture_active_time column with proper indexing
- **System settings integration**: New api_updates_default_count setting (default: 10)
- **Backfill utility**: backfill_fixture_times.py for existing fixture data migration
- **Fallback mechanisms**: Graceful degradation for existing data without timestamps
- **Query optimization**: Proper limits and ordering for both default and filtered queries

## Bug Fixes
- Fixed logging import errors in models.py (get_logger function)
- Python 2.7 compatibility fixes in migration scripts
- Type conversion issues in SystemSettings.get_setting()

## Documentation
- Created comprehensive CHANGELOG.md
- Updated README.md with new endpoint documentation and examples
- Added API usage examples for both GET and POST methods
- Updated version to 1.2.0 with feature highlights

## Files Modified
- app/api/routes.py: New /api/updates endpoint with hybrid auth
- app/models.py: Added fixture tracking methods and backfill utility
- app/database/migrations.py: Migration_005 for schema changes
- backfill_fixture_times.py: Data migration utility for existing fixtures
- README.md: Updated documentation and examples
- CHANGELOG.md: Comprehensive change log following keep-a-changelog format