Selfhosted

Looks fairly sane, finds every file in the given directory that was created in the last 24 hours and deletes them. Personally if you are dealing with CSAM I'd be using shred instead of just rm

sudo

As root

find /srv/lemmy/example.com/volumes/pictrs/files

Find files in /srv/lemmy... that:

-type f

Are plain files (not directories, symlinks, etc; includes images)

-ctime -1

And were created within an amount of time (probably last day, haven't used this flag in a while)

-exec rm {} \\;

For each matching file found execute rm on it (delete it).

sudo find /srv/lemmy/example.com/volumes/pictrs/files -type f -ctime -1 -exec rm {} \;

• sudo: run as root
• find /srv/lemmy/example.com/volumes/pictrs/files -type f: find files (f) in directory
• -ctime -1: which have been created in the last day
• -exec rm {} ; execute the command rm (remove) on each of them

You'll need to find where the actual container files are being stored. I'm unfortunately not familiar with Lemmy Easy Deploy, but you should have a folder that has some files/folders like docker-compose.yml, volumes, lemmy.hjson.

The important one is the volumes/pictrs/files folder, take the full path of that folder and replace it with the /srv/lemmy/example.com... path from the original post, and then that command should work.