Plex added localization to the DB so you now need to use the embedded Plex Media Server sqlite extension. For Windows it will be one dash instead of two.
If I may help here?
To invoke the resident SQLite3 module.
"/usr/lib/plexmediaserver/Plex Media Server" --sqlite
If you wish to go further in to Plex Media Server/Plug-in Support/Databases to save typing of the path, that’s fine.
[/share/CACHEDEV3_DATA/.qpkg/PlexMediaServer] # ./Plex\ Media\ Server --sqlite
SQLite version 3.26.0 2018-12-01 12:34:55
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite>
Y…
