what version and are you actually using the intro skipper plugin? After (iirc) 10.10 the plugin was upstreamed and is now media segments built into the app, though it’s technically still listed as a plugin

Prior to 10.10 with the 3rd party plugin there should be an introskipper.db file in /config/data/introskipper (full path depends on os/install. After that it was integrated into the main Jellyfin.db in /config/data

Note that restoring an old Jellyfin.db means any changes since the file was used (watch status, media import, metadata changes, etc) will need to be recreated. This generally isn’t a huge issue (rescan library and mark whatever as watched since backup) unless you’ve made a bunch of manual metadata overrides or custom images or something. Def the easiest option if that’s not the case

Theoretically you could extract the “MediaSegments” table and insert it into current db but you should definitely back up the current db before you muck around with this. I certainly have had to muck with the db and it can create weirdness (there’s a bug with live tv where orphaned channels never go away so if you change iptv subscriptions every few months you can end up with like 70,000 channels, 90% of which don’t work. Only workaround I’ve found is to manually empty the tables in the db. Been present for at least 5 years but I’m pretty sure tv tuner stuff is a super low priority)

You are also correct: media identifiers are GUID hashed from the path (including filename). Changing path to media or filename will change the identifier. You could probably remap this in the db too but this is honestly probably a fucking nightmare and it would probably be easier to just read the values from a backup and add them back manually