feat: implement dynamic class duration timer

fix(backend): handle NoneType exception for last_seen and upgrade absent status on late arrival

chore(backend): temporarily change outgoing attendance threshold to 5 minutes for testing

fix(backend): always broadcast marked status for existing attendance records to ensure ui ticks appear after refresh

feat: implement two-step attendance with incoming and outgoing logs

fix(backend): catch RuntimeError on websocket send_json when connection closes

fix(backend): import Subject in main.py to fix NameError during attendance marking

fix: resolve attendance calculation and 0 alerts for multiple daily sessions by using dynamic periods

fix: Wrap websocket loop in try-except and add missing models import

fix: use naive UTC datetimes for database operations to resolve asyncpg offsets clash

fix: cast numpy types to python natives in faces_info for JSON serialization

feat: optimize streaming to JSON coordinates and implement direct backend attendance marking

fix: import face_engine globally to resolve NameError in websocket handler

feat: implement client-side frame websocket streaming and dynamic YOLO conf

feat: add semester 5 subjects database seeding and search by email

Implement receiving frames over WebSocket

Update for Hugging Face