**Data Structure**
- Two-table architecture: main observations layer + separate photos table
- One-to-many relationship between observations and photos
- Multiple photos per observation now properly supported
- Photo URLs stored in dedicated related table instead of single field

**Taxonomy Database System**
- Local taxonomy database (1.4 million taxa from iNaturalist)
- Database Manager interface for installation and updates
- Significant performance improvement for taxonomy enrichment

**User Interface**
- Photo viewer for observation images
- Three date filtering modes: exact date, date range, months-specific
- Improved input validation

**Other**
- Bilingual interface (French/English)
- Context-sensitive help

**Technical**
- QGIS 3.40+ (tested on 3.40 Bratislava)
- Python 3.12
- Requires pyinaturalist library