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   1  -- Stores the groups the user has once belonged to.
   2  -- The user may still belong these groups. Check user_groups.
   3  CREATE TABLE /*_*/user_former_groups (
   4    -- Key to user_id
   5    ufg_user int unsigned NOT NULL default 0,
   6    ufg_group varbinary(255) NOT NULL default ''
   7  ) /*$wgDBTableOptions*/;
   8  
   9  CREATE UNIQUE INDEX /*i*/ufg_user_group ON /*_*/user_former_groups (ufg_user,ufg_group);