-SQL_QUERY("ALTER TABLE `{!_MYSQL_PREFIX!}_filters` ADD UNIQUE `name_function` (`filter_name` , `filter_function`)", __FILE__, __LINE__);
+SQL_QUERY('ALTER TABLE `{?_MYSQL_PREFIX?}_filters` DROP KEY `name_function`', __FILE__, __LINE__);
+SQL_QUERY('ALTER TABLE `{?_MYSQL_PREFIX?}_filters` ADD UNIQUE `name_function` (`filter_name` , `filter_function`)', __FILE__, __LINE__);