timestamp as int

Hello,
What is the equivalent of the following but in the integer version.

 Column('_last_updated', DateTime(True),
                                    default=func.current_timestamp(),
                                    onupdate=func.current_timestamp()),

 Column('_last_updated', Integer, default=int(time.time(), onupdate=func.???),

I see that project like trac uses the integer timestamps extensively.
Can it be used safely in any other project or there are some drawbacks
for it?

Thanks,
Lucas

--

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Using rsync. How to setup rsyncd.
http://lucasmanual.com/mywiki/rsync
DataHub - create a package that gets, parses, loads, visualizes data
http://lucasmanual.com/mywiki/DataHub

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