def delete_budget(self, model_uuid):
        """Delete a budget.

        @param the name of the wallet.
        @param the model UUID.
        @return a success string from the plans server.
        @raise ServerError via make_request.
        """
        return make_request(
            '{}model/{}/budget'.format(self.url, model_uuid),
            method='DELETE',
            timeout=self.timeout,
            client=self._client)