Lars Yencken avatar Lars Yencken committed fb75749

Fixes #2, removing use of left_visit as a primary key.

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 class HierarchicalModel(models.Model):
     "A generic hierarchical database model."
 
-    left_visit = models.IntegerField(primary_key=True)
+    left_visit = models.IntegerField(db_index=True)
     right_visit = models.IntegerField(db_index=True)
 
     class Meta:
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