--- /dev/null
+define mw_prefix='{$wgDBprefix}';
+
+/*$mw$*/
+BEGIN
+ EXECUTE IMMEDIATE 'ALTER TABLE &mw_prefix.user_former_groups MODIFY ufg_group VARCHAR2(255) NOT NULL';
+EXCEPTION WHEN OTHERS THEN
+ IF (SQLCODE = -01442) THEN NULL; ELSE RAISE; END IF;
+END;
+/*$mw$*/