[Bug] SudoSOS saturates all its available MariaDB connections

[Yoronex]

Current behavior

SudoSOS saturates all its available MariaDB connections and does not close any connections it is not using. This is problematic, as it is for example not possible to use the CLI. Also, when restarting, it might be that all connections are in use and the rebooted instance is not able to make any DB connections, thus not starting properly.

Desired behavior

Possible solutions might be:

• Gracefully close all connections when stopping SudoSOS (AppDataSource.destroy()).
• Do not keep any connections alive; instead, have TypeORM make a new connection for every query/transaction.
  However, other (undiscovered) possible solutions might also work.

API Route

No response

Steps to reproduce

Start SudoSOS prod on the GEWIS server. If you try to use the CLI, it will not have any connections available. Furthermore, a restart might cause it to hang on [INFO] Application - Starting application instance....

Logs and Error Messages

No response

Other Information

No response