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If you already have the tables created in the database and you are not using south there are two options. The first one is to delete the tables and re-create them again using syncdb and the second is to make the schema changes manually(this is probably going to be hard and ugly).
As for the south … do not think of it as some unstable third party app that you may not need. Even that it has some limitations it is an extremely useful tool and you will only benefit form using it so don’t worry and go ahead with it.
Source:stackexchange.com