* Using PostgreSQL:
  $ HYDRA_DBI="dbi:Pg:dbname=hydra;" hydra_server.pl

        # Mark this job as active in the database.

        # Update the last evaluation time in the database.

            , active => 1

        # Mark all existing jobs that we haven't seen as inactive.
        my %jobNames;
        $jobNames{$_->{jobName}}++ foreach @{$jobs->{job}};
    

        # Update the last checked times and error messages for each
        # job.

            $jobInDB->update({active => $jobNames{$jobInDB->name} || $failedJobNames{$jobInDB->name} ? 1 : 0});

    -- `active' means the Nix expression for the jobset currently
    -- contains this job.  Otherwise it's a job that has been removed
    -- from the expression.
    active        integer not null default 1,

    active        integer not null default 1, -- !!! obsolete, remove