Adding south.
Some Notes ti add south to an existing projects : http://south.readthedocs.org/en/latest/convertinganapp.html#converting-an-app
./manage.py syncdb # TO create south tables
./manage.py convert_to_south myapp # To initialize south
./manage.py schemamigration myapp --auto  # To compute the diff
./manage.py migrate mypp # To apply the diff