//do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $meta_value );

add_action('added_post_meta', 'added_post_meta_filter',1,4);



function added_post_meta_filter($postid,$objectid,$mk,$vl){

	if ($mk == 'exiers'){

        //here is should be get post categories, 

        // is post in categories,

        // is yeas filter data

        // and direct update thought wpdb 

        }

}