EtlExecutionRepository - method should return int but returns string

[johbuch]

In this class Repository/EtlExecutionRepository.php
The method getAvgWaitTime seems to returns string

public function getAvgWaitTime(\DateTime $startTime, \DateTime $endTime): int
    {
        $result = $this->createQueryBuilder('cm')
            ->select('AVG(cm.runTime) as waitTime')
            ->where("cm.createTime > :startTime")->setParameter('startTime', $startTime)
            ->andWhere("cm.createTime <= :endTime")->setParameter('endTime', $endTime)
            ->getQuery()
            ->getSingleResult();

        return (isset($result['waitTime'])) ? $result['waitTime'] : 0;
    }