#4: code completely messed up, but nested upload working; nevertheless download is NOT returning the nested view

#2: many-to-many relationship for role codes seem to work now within FastAPI; will probably again not work with pytest; has to be cleaned up again: just storing before crash

#1: added another test (timeseries not existing); tried to have more user-friendly error messages; still struggling why I get doubled quotation marks now

#1: pytest for uploading data with no_autoflush now working; added timeshift_from_utc to data insertion; added error message if trying to insert duplicates

#1: pytest for data established; renamed date_time to datetime; needed 'no_autoflush' in timeseries queries

adapted sphinx documentation to new structure (ONE app); some pretty printing (fastAPI does not provide sphinx extensions like django)

created ONE toardb app, also adapted pytests for toardb app (still very last test will throw an error for teardown; inserted example for url percent encoding