How do I purge non-instance data? - sh.itjust.works

I have a tiny little instance that’s being absolutely overwhelmed after I connected it to other communities. I’ve run a script to give me something like 40K posts to toss off to the purge API, but somehow my disk usage is expanding while this purge is going on. My disk usage is being caused by all the media, but I’m sure out to nuke media from outside of the instance efficiently. The API calls are kind of slow. I’d rather just issue a direct command to delete the media from existence, but I haven’t been able to find where the delete tokens for posts are stored to just rapid fire issue the command from within my server (and thus not have to stagger my calls to not be rate limited) Can someone help me? I feel like there’s something pretty simple I’m overlooking here.