Index: /trunk/src/lyceum/wp-admin/upgrade-schema.php =================================================================== --- /trunk/src/lyceum/wp-admin/upgrade-schema.php (revision 1004) +++ /trunk/src/lyceum/wp-admin/upgrade-schema.php (revision 1012) @@ -97,5 +97,6 @@ category_id int unsigned NOT NULL default '0', PRIMARY KEY (rel_id), - KEY post_id (post_id,category_id) + UNIQUE post_id (post_id,category_id), + UNIQUE category_id (category_id,post_id) ) ENGINE = InnoDB; CREATE TABLE $wpdb->postmeta (