public List<TChargingEvent> Get()
        {
            var minExportId = _shardState.GetExportId();
            var date = DateTime.Now.Subtract(_delay);

            var doc = _mongoCollection.FindAs<TChargingEvent>(
                Query.And(
                    Query.NE("ExportId", BsonNull.Value),
                    Query.LT("LastUpdateDateTime", BsonDocumentWrapper.Create(date)),
                    Query.GT("ExportId", BsonValue.Create(minExportId))))
                .SetFields("ExportId")
                .SetSortOrder(SortBy.Ascending("ExportId"))
                .SetLimit(_maxBatchSize);

            if (doc == null || !doc.Any())
            {
                return null;
            }

            var maxExportId = doc.Max(x => x.ExportId);

            List<TChargingEvent> interims = _mongoCollection
                .FindAs<TChargingEvent>(
                    Query.And(
                        Query.GT("ExportId", BsonValue.Create(minExportId)),
                        Query.LTE("ExportId", BsonValue.Create(maxExportId))))
                .SetSortOrder(SortBy.Ascending("ExportId"))
                .ToList();

            if (interims.Count == 0)
            {
                return null;
            }

            return interims;
        }