Taking a look at the common directory in the repo it looks like this only contains legacy stuff from when erfgoedbot lived on the toolserver. I also can't see anything using these files that is live right now.
Unless we are using this somewhere I would suggest dropping that directory to reduce the clutter in the repo.
I added @Platonides as a subscriber since his name shows up in that code (but that might just mean it has been copy-pasted from somewhere else)