This greatly reduced the amount of duplicate code in the DataBaseHandlers
Not sure how secure this is SQL injections. Need to check that and maybe
put in some guards. Using double underscores for now and only provide a
getter. But then again why bother with an SQL injection as
you can just as easily modify the Python code, and we still have the old
Containers to fallback to if the Database gets corrupted.
Contributes to CURA-6096
