PlexDBRepair: GitHub - ChuckPa/PlexDBRepair: Database repair utility for Plex Media Server databases
It does a more thorough job than the steps in the Repair a Corrupted Database article.
The Readme has instructions for various platforms.
Use the AUTO option.
If it cannot fix the database, try REPLACE to use a backup copy, if any are available.
Here’s an example running on a Synology NAS: GUI based database corruption identification/repair - #2 by FordGuy61
