Not super active, but I found some of the articles pretty useful (recently the fixing of incorrect addedAt timestamps in Plex helped me out), so I wanted to leave a link to it here:
FWIW in my case I’m running Plex in a Docker container, so I connected to it with docker exec -it plex bash and ran /usr/lib/plexmediaserver/Plex SQLite /config/Library/Application Support/Plex Media Server/Plug-in Support/Databases/com.plexapp.plugins.library.db inside the docker container to be able to fix the dates (my Plex library is mounted as /config inside the container). Meant to post that as a comment but his comment section isn’t working at the moment. :/