Process completed with exit code 4.

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-python@v4. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Non-nullable field 'data' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Nullability of reference types in type of parameter 'source' of 'void NotificationSystem.OnTimedEvent(object source, ElapsedEventArgs e)' doesn't match the target delegate 'ElapsedEventHandler' (possibly because of nullability attributes).

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'apiKey' in 'User AuthProvider.GetUser(string apiKey)'.

Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.

Non-nullable field '_timer' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Possible null reference return.

Possible null reference return.