Loose ideas

Run in background permanently
CLI database creation and version management, migrations
On a loop iterate over all configured Kodi instances' JSON-RPC endpoints
- Get state either:
  - Polling:
    - Check if a player is running
    - If yes check if player is playing back something
    - If yes
      - Subtract check interval from avaialble playback time (stored in database)
      - Render new imagemagick overlay for sddm avatar indicating remaining time
  - WebSockets and a subscription to notifications
    - Get auto updates from Kodi
    - What happens when user starts third party application such as an emulator?
- If less than n time left trigger Kodi notification
- If time's up check if playback running
  - If yes end playback
  - Exit Kodi
  - Make user unable to login again (locked, displayed in sddm theme?)
- If it's time to allocate time do that
  - Render new imagemagick overlay
  - Unlock account
    - If sddm-greeter is active reload the systemd unit or something like that
Options
- Per instance
  - Kodi address, username, password, address is mandatory
  - Time of day when daily budget's allocated
  - Daily playback budget, defaults to 20min, optional
  - Max savable playback budget, defaults to 120min, optional
  - Regex for showtitles that get preferential treatment
  - Time subtract factor for preferential shows, defaults to 0.5
  - Max playback time per day, defaults to 20min which equals 40min of preferential shows
  - bools to enable/disable both notifications altogether
  - Kodi notification lead time, defaults to 5min
  - Kodi notification display time, defaults to 10s Time use factor for preferential shows
- Global
  - Database credentials
  - Check interval, maybe default 20s
    - Check if user's trying to override it and warn about it