Hello,

After django 1.8, the mysql backend no longer strips microseconds. 
This is giving me some issues when upgrading from 1.7 (I actually upgraded 
to 1.9 directly), since date times are not stored with micro second 
precision on mysql, but the queries are sent with them.
As I see it, my only option is to update all existing date time columns of 
all existing tables, which is quite boring since there are many tables.
Is there a way I can explicitly set the model datetime precision? Will this 
work with raw queries also? Could this be a global setting or monkey patch? 
This new behaviour basically breaks any '=' query on date times, at least 
raw queries (I haven't tested the others) since it sends micro seconds 
which are not stripped down.

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