sha,message,author_date,committer_date,raw_author,raw_committer,repo,author,committer
bc9c4db34b815f5385abbf4bb491bab0e10779db,.update(...) with no update argument sets last_pk,2019-07-28T14:59:52Z,2019-07-28T14:59:52Z,13ae486343ea6454a93114c6f558ffea2f2c6874,13ae486343ea6454a93114c6f558ffea2f2c6874,140912432,9599,9599