** Changed in: zeitgeist
       Status: Fix Committed => Fix Released

Make timestamp related queries faster
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Status in Zeitgeist Framework: Fix Released

Bug description:
When grep'ing the source of `unity-place-applications` and `unity-place-files` 
you will find out that these two products are using the FindEvents method, and 
both products are using this method to query for the complete time interval [0, 
sys.maxint] (aka. TimeRange.always()). And I've seen similar queries in other 
clients too. So I think it is worth trying to optimize the query for this kind 
of queries.

The attached script is timing the exactly same query which is used in 
`unity-place-applications` on a database which contains 50k events, with 100 
randomly choosen different actors.

On lp:zeitgeist the find_events query returns the 6 events with most popular 
actors in ~0.22s
---> MostPopularActor: get len(ids)=6 using .find_eventids() in 0.224661s

By making the sql queries on the timestamp column conditional we will be able 
to reduce this time to
---> MostPopularActor: get len(ids)=6 using .find_eventids() in 0.069161s

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