Saved Searches Lost

I just recently upgraded to Calibre 3.39.1 and lost all my saved searches, which, unfortunately, I hadn't backed up in over a year. I am, however, diligent about backing up the whole database, so I thought I could swap out the db file and metadata_db_prefs_backup.json from the back up, open the saved searches and export it. Then I would copy the current db file back and reimport the saved searches json file. But there were no saved searches when I opened the editor.

So, my question is, where are the saved searches stored, if not somewhere in these files?

Hope Someone Can Help,
Jeff