remove irrelevant comment

(unique fields are automatically indexed in Django)

ippisite/ippidb/models.py

@@ -192,7 +192,6 @@ class PpiComplex(models.Model):
 
 class Compound(models.Model):
     canonical_smile = models.CharField('Canonical Smile', unique=True, max_length=500)
-    #TODO index this table on canonical_smile
     is_macrocycle = models.BooleanField('Contains one or more macrocycles') 
     aromatic_ratio = models.DecimalField('Aromatic ratio', max_digits=3, decimal_places=2)
     balaban_index = models.DecimalField('Balaban index', max_digits=3, decimal_places=2)