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   1  CREATE TABLE user_former_groups (
   2    ufg_user   INTEGER      NULL  REFERENCES mwuser(user_id) ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED,
   3    ufg_group  TEXT     NOT NULL
   4  );
   5  CREATE UNIQUE INDEX ufg_user_group ON user_former_groups (ufg_user, ufg_group);