code: private function registerCalc($period)
      {
          $ctx = new \Praxigento\Core\Data();
          $ctx->set(PCalcReg::IN_CALC_TYPE_CODE, Cfg::CODE_TYPE_CALC_FORECAST_PHASE1);
          $ctx->set(PCalcReg::IN_PERIOD, $period);
          /** @var \Praxigento\Core\Data $res */
          $res = $this->zCalcReg->exec($ctx);
          $result = $res->get(PCalcReg::OUT_CALC_ID);
          return $result;
      }
docs: Register new compression calculation.
  
  @param string $period
  @return int calculation ID.