Change node_types:class to length 30 instead of 10.

sql/database-create.sql

@@ -858,7 +858,7 @@ CREATE TABLE node_type_features (
 --
 
 CREATE TABLE node_types (
-  class varchar(10) default NULL,
+  class varchar(30) default NULL,
   type varchar(30) NOT NULL default '',
   proc varchar(30) default NULL,
   speed smallint(5) unsigned default NULL,

sql/database-migrate.txt

@@ -1702,3 +1702,7 @@ last_net_act,last_cpu_act,last_ext_act);
 
 	alter table node_types add isdynamic tinyint(1) NOT NULL \
 		default '0' after isphantom;
+
+1.257: Change node_types:class to length 30 instead of 10.
+
+	alter table node_types change class class varchar(30) default NULL;