title: Backwards migration with Django South
body: <p>Ok, so this seems like a really silly thing to ask, and I'm sure I'm missing something somewhere.</p>
  
  <p>How do you perform a backwards migration using South on Django?</p>
  
  <p>So I've tweaked my models, created a migration with <code>schemamigration</code>, run the migration with <code>migrate</code>, and now I realise that's not quite what I wanted and I want it back the way before.</p>
  
  <p>Short of manually editing db tables and removing migration files, how should I go about rolling the migration back? I find references to backward migrations using South via Google, but have yet to find a solid code example for it.</p>
  
  <p>Can anyone help?</p>