code: @Indexable(type = IndexableType.DELETE)
  	@Override
  	public CommerceDiscount deleteCommerceDiscount(long commerceDiscountId)
  		throws PortalException {
  		return commerceDiscountPersistence.remove(commerceDiscountId);
  	}
docs: Deletes the commerce discount with the primary key from the database. Also notifies the appropriate model listeners.
  
  @param commerceDiscountId the primary key of the commerce discount
  @return the commerce discount that was removed
  @throws PortalException if a commerce discount with the primary key could not be found