class ObfuscatedPKModel(models.Model):
    class Meta:
        abstract = True
        
    id = models.BigIntegerField(primary_key = True, db_index = True)
    
    def save(self, *args, **kwargs):
        if not self.pk:
            kwargs["force_insert"] = True
            while True:
                # Avoid generating 0
                self.pk = random.randint(-models.BigIntegerField.MAX_BIGINT - 1, models.BigIntegerField.MAX_BIGINT) or models.BigIntegerField.MAX_BIGINT
                try:
                    super(ObfuscatedPKModel, self).save(*args, **kwargs)
                    break
                except IntegrityError:
                    logger.info("Duplicate PK situation averted.")
                    continue
        else:
            super(ObfuscatedPKModel, self).save(*args, **kwargs)