sa_mysql_dt
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MySQL, unlike for instance, PostgreSQL, doesn't support datetime
columns with a sub-second granularity. This means that it is not
possible to distinguish between two datetimes that were generated in
the same second.

This can however be very useful. This package defines a new field type
for SQLAlchemy that should be a drop-in replacement for the standard
SQLAlchemy DateTime. It stores its information in a Numeric column to
enable sub-second granularity. 

It's probably also not properly timezone aware.

To use it in a SQLAlchemy table definition as a column type, import it
instead of SQLAlchemy's version::

  >>> from sa_mysql_dt import DateTime
