XF 1.2 How to query the database where the signature is stored?


Well-known member
So I'd like to search on the signature field of all my forum user's.
This bbcode [photo] was use by Xengallery addon.

I want to search if who else are using this code on their signature and modify them one by one.
I have 140K of user's and I think only a few are using the bbcode.