--- /dev/null
+define mw_prefix='{$wgDBprefix}';
+
+ALTER TABLE &mw_prefix.page_restrictions DROP CONSTRAINT &mw_prefix.page_restrictions_pk;
+
+ALTER TABLE &mw_prefix.page_restrictions ADD CONSTRAINT &mw_prefix.page_restrictions_pk PRIMARY KEY (pr_id);
+
+CREATE UNIQUE INDEX &mw_prefix.page_restrictions_u01 ON &mw_prefix.page_restrictions (pr_page,pr_type);