We cannot track anonymous users as the session expires after 10 minutes of
inactivity. This also avoids an issue where there is an error when the user's
session has expired and they navigate a page
Instead of working with django model mixins it now uses a separate
model entity to keep track of the personalized pages (metadata).
The current downside of this approach is that the segment of an existing
variant is no longer easily adjustable for now.
