services icingaweb2
was gonna check this out to see if it’s any good…
apart from the module source code, there doesn’t seem to exist any examples on how to get this authenticated.
I’ve taken a look at the test , but it doesn’t seem to give to much on getting the application authed. 
I’m not a user of this tool.
But based on module example and icinga docs, it should look like this:
services.icingaweb2.authentications.auth_db.backend = "db";
services.icingaweb2.authentications.auth_db.resource = "icingaweb-mysql";
Then you should connect directly to database and create the user