docs: def _init_dates(self):
          """Initialize all dates properties
          """
          if self.total_transactions == 0:
              return None
          self.epoch_start = Result.select(Result.epoch).order_by(Result.epoch.asc()).limit(1).get().epoch
          self.epoch_finish = Result.select(Result.epoch).order_by(Result.epoch.desc()).limit(1).get().epoch
          self.start_datetime = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(self.epoch_start))
          self.finish_datetime = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(self.epoch_finish))