We don't use seconds. We use milliseconds since the Unix epoch.

I dislike floating point timestamps because of two things:

 * Python is the only language I have ever heard of that use floats for 
timestamps
 * Float-comparisons (and thus db-indexes) are less effective than integer 
comparisons

-- 
Use REAL for timestamps
https://bugs.launchpad.net/bugs/483603
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Status in Zeitgeist Engine: New

Bug description:
Seconds are not fine-grained enough to differentiate events, so we should store 
the timestamps as floating-point numbers.

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