To do in the future

Features

Backend

Check the "status" of a video (if it is unavailable)
Handle search terms in column G on sheet
Add google sheet function to update API server when data changes instead of calling it manually
Use database instead of storing responses in json files
Eventually allow users to use their own Google Sheet

Frontend-ish

Add "History" tab that shows recently played videos
Add filters for channels, playlists, videos and search terms

Bugs

Ensure randomness for both playlists and videos
Add tests