[DaveBlake]

• Do a full Video Library Export (separate files are preferred), with watch statuses and resume points.
  

Music library issue @Klojum, exporting music lib in v17 does not save song playback or rating data (v18 does) so that wil be lost. Export will only save the current additional artist and album data that may have been scraped from online sites.

Does sound like a db corruption. Use a SQL tool to take a copy of v60, it could be possible to salvage data if despirate, and then get it out the way or Kodi will keep trying to migrate it. But most of the music library data comes from scanning embedded metadata from the music files themselves, so starting again should not be too painful. Then re-scrape artist art and additional info (unless you have local art and nfo files for the additional data).

The loss will be song playback (count and last played) and user rating data that is dynamically changed during Kodi use. If really needed you can see what can be salvaged from the corrupted db.