Thanks, that was helpful!
Unfortunately, I think I managed to screw it all up by doing the pg upgrade stuff in the wrong order (specifically, I forgot to backup the database before rebuilding the app again). I do have the files saved as postgres_data_old, but I can’t seem to get at them (my pg9.3 also seems to have disappeared in favor of pg-xc). Am I screwed? Currently all I’m seeing is the default discourse install