title: Should I use UUID everywhere or is it alright to mix with usual IDs?
body: <p>I've chosen to use UUIDs as primary key for all of my tables in DB. But I still have Django default tables like Groups, Permissions, Django_admin_log, etc. Should I override them to make the pk UUID or should I leave it like that?<br>
  Leaving it usual integer is simpler of course, but I feel like mixing usual ids and UUIDs in the database is at least confusing. I don't have explicit need to override them to use UUID, but still I can't come up with the conclusion.</p>