Plex screwed up adding my DVB-C tuner and now there doesn’t appear to be any way of forcing Plex to let me reselect the muxes to scan. Deleting the DVR doesn’t actually delete any of the cached settings, which is insanely stupid, and I have no clue how to get it to delete them.
As reference to anyone else who stumbles upon this issue: you need some tool that is able to modify sqlite-databases (I use sqlitebrowser), then you need to find your com.plexapp.plugins.library.db – I, for example, have it at /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-in Support/Databases/com.plexapp.plugins.library.db under Ubuntu Linux.
Within that database, you need to delete the relevant entries inside the media_provider_resources - table, after which you can redo the tuner-settings completely from scratch – turn PMS off, edit the database, restart PMS, re-add the DVR, and now you can select different muxes for it.
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