Check TODOs for final clean-up

[florence-bockting]

Description

The following list includes changes/TODOs that have been done during the development process, but which should be checked/reset for the first prototype version of the Python package.

Please check / reset the following

• CI fails when code coverage is below 90% (see section [tool.coverage.report] in pyproject.toml and set fail_under = 90)