* When
reverting, do a select count(*) where md5=? and then do something
more advanced when more than one match is found
finally "we don't need an
index on it" becomes "we need an index on it", and storage efficiency
becomes much more interesting (binary packing yay ;-)
so, what are the use cases and how does one index for them? is it global hash check, per
page? etc
Domas