Fix to previous revision; when I changed the primary key, some of the

fields are automatically updated to not allow NULL.

sql/database-create.sql

@@ -820,10 +820,10 @@ CREATE TABLE `delays` (
   `eid` varchar(32) default NULL,
   `pid` varchar(48) default NULL,
   `vname` varchar(32) default NULL,
-  `vlan0` varchar(32) default NULL,
-  `vlan1` varchar(32) default NULL,
-  `vnode0` varchar(32) default NULL,
-  `vnode1` varchar(32) default NULL,
+  `vlan0` varchar(32) NOT NULL default '',
+  `vlan1` varchar(32) NOT NULL default '',
+  `vnode0` varchar(32) NOT NULL default '',
+  `vnode1` varchar(32) NOT NULL default '',
   `card0` tinyint(3) unsigned default NULL,
   `card1` tinyint(3) unsigned default NULL,
   `noshaping` tinyint(1) default '0',