bugfix - fix webhooks breaking MessageAuthor unique index
bugfix - fix webhooks breaking MessageAuthor unique index

discrim == 0 for all webhooks

ThaTiemsz/jetski,b1naryth1ef/rowboat,b1naryth1ef/rowboat,b1naryth1ef/rowboat,b1naryth1ef/rowboat,aliasfalse/rowboat,aliasfalse/rowboat,ThaTiemsz/jetski,ThaTiemsz/jetski,aliasfalse/rowboat,ThaTiemsz/jetski,aliasfalse/rowboat