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
- wikidatawiki