title: How to drop "unique_together" constraint
body: <p>I used the unique_together between to fields and after some time and new requirements I've decided I want to remove it so I deleted it from the models definition, but still it seems to be causing "Duplicate entry" problems.
  Do I have to drop some constraint on the database? in that case, how can I do it (I use phpmyadmin).</p>
  
  <p>Thank You</p>