Index: branches/5.2.x/install/install_schema.sql
===================================================================
diff -u -N -r13839 -r14088
--- branches/5.2.x/install/install_schema.sql	(.../install_schema.sql)	(revision 13839)
+++ branches/5.2.x/install/install_schema.sql	(.../install_schema.sql)	(revision 14088)
@@ -34,8 +34,8 @@
   EditorsPick tinyint(4) NOT NULL DEFAULT '0',
   `Status` tinyint(4) unsigned NOT NULL DEFAULT '2',
   Priority int(11) NOT NULL DEFAULT '0',
-  OwnerId int(11) NOT NULL DEFAULT '-1',
-  ModifiedById int(11) NOT NULL DEFAULT '0',
+  OwnerId int(11) DEFAULT NULL,
+  ModifiedById int(11) DEFAULT NULL,
   ResourceId int(11) DEFAULT NULL,
   TopicType int(11) NOT NULL DEFAULT '1',
   CreatedOn int(11) DEFAULT NULL,
@@ -167,7 +167,7 @@
   CommentId int(11) NOT NULL AUTO_INCREMENT,
   PollId int(11) NOT NULL DEFAULT '0',
   AnswerId int(11) DEFAULT NULL,
-  CreatedById int(11) NOT NULL DEFAULT '-2',
+  CreatedById int(11) DEFAULT NULL,
   GuestName varchar(255) NOT NULL DEFAULT '',
   GuestEmail varchar(255) NOT NULL DEFAULT '',
   CommentBody text,