Description of problem: if user attempts to change the keystone config to use an ldap backend for Identity and an sql backend for Assignments, it is forced to update manually the database relations created for all the pre-existing users in "user_project_metadata.user_id" as users there are referenced by UUID Version-Release number of selected component (if applicable): openstack-keystone-2013.2.2-1.el6ost.noarch Expected: A migration script could probably update the references by matching old UUIDs to LDAP users and update the user_id field accordingly
We don't see this sort of migration as a common use case. It is possible to write a script to perform the migration, but it's likely something that could best be done on a one-off basis or when the need arises.