class MyModel(models.Model):
    clid = models.AutoField(primary_key=True, db_column='CLID')
csid = models.IntegerField(db_column='CSID')
cid = models.IntegerField(db_column='CID')
uuid = models.CharField(max_length=96, db_column='UUID', blank=True)


class Meta(models.Meta):
    unique_together = [['csid', 'cid', 'uuid']]
error_messages = {NON_FIELD_ERRORS: {'unique_together':
    "%(model_name)s's %(field_labels)s are not unique."}}
Пользовательское имя ключа unique_together