Improve cache handling

[tom-englert]

Deleting the data base file does no longer break CC

[sharwell]

💡 I prefer to see this list the actual exception types which are known to be thrown for the cases you describe.

[tom-englert]

I fully agree, but here the exceptions may come from the DB providers and are neither documented nor consistent between DB providers - you can only get them by trial and error using all known providers, but then the code may break with any unknown provider.

[sharwell]

I haven't tested this, but from the comments I felt I clearly understood both the problem and the way it's being solved (it makes my day when I see this happen). I'm not sure whether or not my requested change is feasible. Hopefully someone with more SQL experience can verify that the code is the best (or good enough) solution to the described problem but otherwise 👍.