DELETE FROM oauth2_consent_session WHERE subject IN(SELECT identifier FROM user_opaque_identifier WHERE username = '' AND service IN('openid', 'openid_connect'));
DELETE FROM user_opaque_identifier WHERE username = '' AND service IN('openid', 'openid_connect');
DELETE FROM user_opaque_identifier WHERE service <> 'openid';
ALTER TABLE oauth2_consent_session MODIFY subject CHAR(36) NULL DEFAULT NULL;
ALTER TABLE oauth2_consent_session
    DROP FOREIGN KEY oauth2_consent_subject_fkey,
    ADD CONSTRAINT oauth2_consent_session_subject_fkey FOREIGN KEY (subject) REFERENCES user_opaque_identifier(identifier) ON UPDATE RESTRICT ON DELETE RESTRICT;
