Wrap notice-saving code in a transaction

classes/Notice.php

@@ -125,6 +125,8 @@ class Notice extends Memcached_DataObject
 			$notice->is_local = $is_local;
 		}
 
+		$notice->query('BEGIN');
+		
 		$notice->reply_to = $reply_to;
 		$notice->created = common_sql_now();
 		$notice->content = common_shorten_links($content);
@@ -158,6 +160,8 @@ class Notice extends Memcached_DataObject
 		// Add to notice inboxes
 		
 		$notice->addToInboxes();
+
+		$notice->query('COMMIT');
 		
 		# Clear the cache for subscribed users, so they'll update at next request
 		# XXX: someone clever could prepend instead of clearing the cache