It was an experimental auth method that we never ended up using. It was removed from MW core in rMW36cade. I mention not dropping it, insofar as I didn't add a `DROP TABLE` statement to the updater, but it was removed from `tables.sql` so it wouldn't be created anymore.
It can be safely dropped everywhere, and should be empty on all wikis already.
This table exist on:
s3
arbcom_fiwiki
arwikimedia
arwikiversity
aswikisource
bdwikimedia
bewikimedia
bewikisource
bjnwiki
boardgovcomwiki
brwikimedia
brwikisource
checkuserwiki
dewikivoyage
dkwikimedia
donatewiki
elwikinews
enwikivoyage
eowikinews
eowikisource
eswikivoyage
etwikimedia
fawikinews
fdcwiki
fiwikimedia
frrwiki
frwikivoyage
gagwiki
guwikisource
hewikivoyage
itwikivoyage
kbdwiki
koiwiki
kowikinews
kowikiversity
krcwiki
lezwiki
liquidthreads_labswikimedia
liwikibooks
ltgwiki
minwiki
mkwikimedia
movementroleswiki
mrjwiki
mrwikisource
mxwikimedia
nlwikivoyage
noboard_chapterswikimedia
noboardwiki
nsowiki
nycwikimedia
ombudsmenwiki
outreachwiki
pcdwiki
pflwiki
plwikivoyage
pnbwiktionary
ptwikivoyage
rowikivoyage
ruewiki
ruwikiversity
ruwikivoyage
sahwikisource
sawikiquote
sawikisource
slwikiversity
sqwikinews
steward
stewardwiki
svwikiversity
svwikivoyage
tenwiki
test2wiki
transitionteamwiki
trwikimedia
ukwikivoyage
vecwikisource
vepwiki
vewikimedia
wikimania2011wiki
wikimania2012wiki
wikimania2013wiki
xmfwiki
s8
[x] wikidatawiki