Also, if it is not much to ask, I know this is not the topic, but could you describe how you make this kind of separation? I have the same requirements for isolation and your experience in the matter would be valuable. :)
http://blog.jerodsanto.net/2011/07/building-multi-tenant-rai...
EDIT: This is my migration hack: https://gist.github.com/1f5e67b018d304dd1198 . Most of the SchemaUtils/Schema stuff is just wrappers around setting the schema_search_path.