Minor tweak to make schemacheck happy.

sql/database-create.sql

@@ -75,7 +75,7 @@ CREATE TABLE `apt_aggregate_nodetypes` (
 DROP TABLE IF EXISTS `apt_aggregate_status`;
 CREATE TABLE `apt_aggregate_status` (
   `urn` varchar(128) NOT NULL default '',
-  `status` enum("up","down","unknown") NOT NULL default "unknown",
+  `status` enum('up','down','unknown') NOT NULL default 'unknown',
   `last_success` datetime default NULL,
   `last_attempt` datetime default NULL,
   `pcount` int(11) default '0',