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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_by_job(cls, job_id):
 """Get a row by Job UUID."""

        try:
            return cls.query.filter_by(
                job_id=job_id
            ).one()
        except NoResultFound:
            raise CrawlerJobNotExistError(job_id)