Fix Ocelot query errors on daemon shutdown

gazelle.sql

@@ -1734,11 +1734,11 @@ CREATE TABLE `xbt_files_users` (
   `downloaded` bigint(20) NOT NULL DEFAULT '0',
   `remaining` bigint(20) NOT NULL DEFAULT '0',
   `uploaded` bigint(20) NOT NULL DEFAULT '0',
-  `upspeed` int(10) unsigned NOT NULL,
-  `downspeed` int(10) unsigned NOT NULL,
+  `upspeed` int(10) unsigned NOT NULL DEFAULT '0',
+  `downspeed` int(10) unsigned NOT NULL DEFAULT '0',
   `corrupt` bigint(20) NOT NULL DEFAULT '0',
   `timespent` int(10) unsigned NOT NULL,
-  `useragent` varchar(51) NOT NULL,
+  `useragent` varchar(51) NOT NULL DEFAULT NULL,
   `connectable` tinyint(4) NOT NULL DEFAULT '1',
   `peer_id` binary(20) NOT NULL DEFAULT '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0',
   `fid` int(11) NOT NULL,