title: django.db.utils.IntegrityError: (1062, "Duplicate entry '22-add_' for key 'content_type_id'")
body: <p>I am using django multiple DB router concepts, having multiple sites with different db's. Base database user will login with all other sub sites. </p>
  
  <p>When i try <strong>syncdb</strong> in base site its worked properly(at any time), but trying <strong>syncdb</strong> with other sites works first time only, if we try next time on-wards it throws integiry error like below </p>
  
  <ul>
  <li><strong>django.db.utils.IntegrityError: (1062, "Duplicate entry
  '22-add_somesame' for key 'content_type_id'")</strong></li>
  </ul>
  
  <p>Once i removed multiple DB router settings in that project means syncdb works properly(at any time). </p>
  
  <p>So is this relates to multiple db router? or what else?</p>
  
  <p>Please anyone advise on this, thanks. </p>