XF 2.1 How can admin remove a user's reaction from a post?

Mr Lucky

Well-known member
I seem to have a user attempting to spam peoples' posts with inappropriate reactions.

So I wonder if there is a way to remove them. I managed to catch the user before he did too many and removed his reaction permssions, but does anyone know of an addon or else where I might find a way to do this one by one in the database?

I see in xf_post there is reactions and reaction_users, but I have no idea how to deal with BLOB - 2 B

EDIT: maybe login as user addon, but I'd rather find another solution first