[Migration/Notifications] Improved the performance of the notificatio…

…n migration between 6.9 to 7.0.

features/cerberusweb.core/patches/7.x/7.0.0.php

@@ -525,7 +525,12 @@ function _700_migrate_inbox_buckets(&$params, $group_inboxes) {
 	$db->ExecuteMaster("ALTER TABLE notification ADD COLUMN activity_point VARCHAR(255) NOT NULL DEFAULT '', ADD INDEX (activity_point)");
 
 	// Convert existing notifications to being activity-based using the activity log
-	$db->ExecuteMaster("INSERT INTO notification (created_date, worker_id, is_read, context, context_id, activity_point, entry_json) SELECT n.created_date, n.worker_id, 0, n.context, n.context_id, al.activity_point, al.entry_json FROM notification n INNER JOIN context_activity_log al ON (n.context=al.target_context AND n.context_id=al.target_context_id) WHERE n.is_read = 0 AND al.created BETWEEN CAST(n.created_date-1 AS unsigned) AND CAST(n.created_date+1 AS unsigned)");
+	$db->ExecuteMaster("INSERT INTO notification (created_date, worker_id, is_read, context, context_id, activity_point, entry_json) ".
+		"SELECT n.created_date, n.worker_id, 0, n.context, n.context_id, al.activity_point, al.entry_json ".
+		"FROM notification n ".
+		"INNER JOIN context_activity_log al ON (n.context=al.target_context AND n.context_id=al.target_context_id) ".
+		"WHERE n.is_read = 0 AND al.created = n.created_date"
+	);
 
 	// Delete the old notifications
 	$db->ExecuteMaster("DELETE FROM notification WHERE activity_point = ''");