code: def add_work_item(self, work_item):
          
          with self._conn:
              self._conn.execute(
                  '''
                  INSERT INTO work_items
                  VALUES (?, ?, ?, ?, ?, ?, ?, ?)
                  ''', _work_item_to_row(work_item))
docs: Add a WorkItems.
  
          Args:
            work_item: A WorkItem.