public override async Task <AggregateOverallResponse> AggregateOverall(AggregateOverallRequest request, ServerCallContext context)
        {
            var cardsIds             = cardsRepository.GetCardsIds();
            var transactionsResponse = await transactionsReadClient.FilterAsync(new FilterTransactionsRequest { Cards = { cardsIds }, TimestampTo = request.TimestampTo, TimestampFrom = request.TimestampFrom }, context.RequestHeaders.SelectCustom());

            var aggregations = Aggregations.CreateOverallCsvReport(new OverallReportData {
                Aggregations = request.Aggregations.ToArray(), Granularity = request.Granularity, Transactions = transactionsResponse.Transactions.ToArray()
            });

            return(new AggregateOverallResponse {
                Portions = { aggregations }
            });
        }