Ventura compatibility issue with Calendar

[voostindie]

In Ventura Apple changed the format of the SQLite3 Calendar database. That's a good thing actually, because now the (names of) tables and columns make kind of sense.

It also broke the "calendar" plugin though, because that one directly accesses the database through SQL. I need to fix these queries.

This will require some effort though. I need to reverse engineer the database structure first, then come up with the proper queries, and then update VPS accordingly.