docs: def append(self, item):
          """
          Add an item to the end of the list
          """
          with self.lock:
              with self._closeable_cursor() as cursor:
                  cursor.execute('''INSERT INTO list (list_index, value) VALUES ((SELECT MAX(list_index) FROM list) + 1, ?)''', (self._coder(item), ) )
              self._do_write()