async def upsert(self, data: dict[str, dict]):
        """Use 'content' field from value for embedding, use key as id.
        If embedding_func is None, use 'embedding' field from value
        """
        raise NotImplementedError
Use 'content' field from value for embedding, use key as id.
        If embedding_func is None, use 'embedding' field from value
        
nano_graphrag/base.py