def add_work_item(self, work_item):
        """Add a WorkItems.

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

        Args:
          work_item: A WorkItem.