looking for ideas/alternatives to providing a page/item count/navigation of items matching a GAE datastore query

Question

I like the datastore simplicity, scalability and ease of use; and the enhancements found in the new ndb library are fabulous.

As I understand datastore best practices, o

Answer 1

1. I notice that gmail is ready with some counts - it can tell you how many total emails you've received, and how many are in your inbox, etc - but on other counts, like full-text searches it says you're looking at "1-20 of many" or "1-20 of about 130". Do you really need to display counts for every query, or could you pre-calculate just the important ones?