assert(result.logFile.find('\'') == std::string::npos);
    txn.exec(fmt("notify step_finished, '%d %d %s'", buildId, stepNr,
            result.logFile.empty() ? "-" : result.logFile));

    assert(result.logFile.find('\t') == std::string::npos);
    txn.exec(fmt("notify step_finished, '%d\t%d\t%s'",
            buildId, stepNr, result.logFile));

    my @payload = split / /, $payload;

    my @payload = split /\t/, $payload;