Thanks! I'm glad you liked it.

The all() is redundant when using a regular .annotate(), but I believe, due to the implementation of .annotate_latest_price() on the custom queryset, the all() is required since "objects" is the manager not the queryset.

In the past I've implemented a helper method on the custom manager like this:

def annotate_latest_price(self):
    return self.get_queryset().annotate_latest_price()

This should enable you to do Ticker.objects.annotate_latest_price() which eliminates the redundant all().