Fix #94 -- Catch database errors more broadly

[herrbenesch]

psycopg.DatabaseError is a common base for all errors that are directly related to the database.

How to test

• Try to provoke a wrong SQL statement e.g. give me all blue roses from the database
• Check the logs for the error and you should get a response

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.83%. Comparing base (5474974) to head (b982173).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #97 +/- ## ======================================= Coverage 95.83% 95.83% ======================================= Files 19 19 Lines 600 600 ======================================= Hits 575 575 Misses 25 25 ```

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[herrbenesch]

thanks @amureki