This is simple case where you need to rename a folder which doesnt have subfolders. A name change directly at the db level would need you to update the global shared variable (nsvs) using update_cache. Now if the folder has subfolders you need to do it recursively for every child else the cache will not be updated and the request processor will not be able to resolve the urls properly. I had written a functionality to move communities around in dotlrn to enable restructuring the community tree by the admin. I can share the code if anybody is interested.
