docs: def mark_exported_sqlite(db_file, older_than=None):
      """Marks rows with verdict as exported."""
      logger.debug("Marking rows in database as exported")
      conn = _open_sqlite(db_file)
      cur = conn.cursor()
      update = "UPDATE testcases SET exported = 'yes' WHERE verdict IS NOT null AND verdict != ''"
      if older_than:
          cur.execute(" ".join((update, "AND sqltime < ?")), (older_than,))
      else:
          cur.execute(update)
      conn.commit()
      conn.close()