Hi, I am looking for a way to better migrate our workspace to Unity Catalog. We have several tables created as external tables and created using mount points, but I am worried that migrating to unity catalog will break those tables if we migrate using external locations. Whats is the best approach for migrating those tables to unity catalog? Should we rewrite the table structure or create brand new tables once we enable unity catalog? I am worries that user access will also be broken in the process as all access is done via mount points now.