Index: /Users/denis/Sites/wp/wp-admin/includes/schema.php
===================================================================
--- /Users/denis/Sites/wp/wp-admin/includes/schema.php	(revision 10857)
+++ /Users/denis/Sites/wp/wp-admin/includes/schema.php	(working copy)
@@ -68,7 +68,7 @@
   comment_approved varchar(20) NOT NULL default '1',
   comment_agent varchar(255) NOT NULL default '',
   comment_type varchar(20) NOT NULL default '',
-  comment_parent bigint(20) NOT NULL default '0',
+  comment_parent bigint(20) unsigned NOT NULL default '0',
   user_id bigint(20) unsigned NOT NULL default '0',
   PRIMARY KEY  (comment_ID),
   KEY comment_approved (comment_approved),
@@ -85,7 +85,7 @@
   link_category bigint(20) NOT NULL default '0',
   link_description varchar(255) NOT NULL default '',
   link_visible varchar(20) NOT NULL default 'Y',
-  link_owner bigint(20) NOT NULL default '1',
+  link_owner bigint(20) unsigned NOT NULL default '1',
   link_rating int(11) NOT NULL default '0',
   link_updated datetime NOT NULL default '0000-00-00 00:00:00',
   link_rel varchar(255) NOT NULL default '',