provide relief to sites that are severely impacted by the slow ITEM_UNSEEN searches. This does not incorporate any other flag optimisations as that will require a major DB update and possibly involve significant downtime. This is just to bite off a little chunk now and provide some much needed relief.

include/notify.php

@@ -32,7 +32,7 @@ function format_notification($item) {
 		'url' => $item['author']['xchan_url'],
 		'photo' => $item['author']['xchan_photo_s'],
 		'when' => relative_date($item['created']), 
-		'class' => (($item['item_flags'] & ITEM_UNSEEN) ? 'notify-unseen' : 'notify-seen'), 
+		'class' => (intval($item['item_unseen']) ? 'notify-unseen' : 'notify-seen'), 
 		'message' => strip_tags(bbcode($itemem_text))
 	);