diff -r 2164d18cb10c -r 2a31905a567d install/schemas/upgrade/postgresql/1126.sql
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/install/schemas/upgrade/postgresql/1126.sql	Thu Jun 02 05:28:28 2011 -0400
@@ -0,0 +1,2 @@
+-- Postgres never did have a constraint on this column.
+UPDATE {{TABLE_PREFIX}}pages SET page_format = 'tinymce' WHERE page_format = 'xhtml';