Merge branch 'collaborative' into 'main'

backend/db/crud.py

backend/db/models.py

backend/db/schemas.py

backend/main.py

backend/requirements.txt

backend/routers/__init__.py

backend/routers/records.py

frontend/src/components/Graph.js

frontend/src/components/Timetable.js

frontend/src/components/index.js

frontend/src/styles/Timetable.css

frontend/src/styles/restaurant.css

frontend/src/views/Restaurant.js