to save you the time I've lost:

It seems that LC8 doesn't support relative paths anymore when connecting to a SQLite db.
It gives you a proper looking connectionID at "revopendatabase", but any subsequent calls to "revdatafromquery" or "revdb_execute" will fail with "no such table ..."
- obviously the connectionID delivered is a fake.
Save yourself the time & use absolute paths now! Try yourself with the attached stack! Tested on Win & Linux.
Have fun!