--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/migration/3.9.0_Any.py	Thu Jun 17 14:43:16 2010 +0200
@@ -0,0 +1,3 @@
+if repo.system_source.dbdriver == 'postgres':
+    sql('ALTER TABLE appears ADD COLUMN weight float')
+    sql('UPDATE appears SET weight=1.0 ')