I'm guessing something that added some categories to some very widely
used infobox or licensing templates.
external links for each language in license templates
for now I made that all 'external links' pointing to self are not
saved in links tables, which makes an easy workaround for most obvious
cases...
every object in the database ended up having hundreds of various links
entries, some of which, like ones in externallinks, are quite big (avg
is around 250 bytes per row, thats without indexing costs).
Domas