async def adelete_last_message(self, key: str) -> Optional[ChatMessage]:
        """Async version of Delete last message for a key."""
        client = await self.get_async_client()
        result = await client.query_single(DELETE_LAST_MESSAGE_QUERY, key=key)
        return ChatMessage.model_validate_json(result) if result else None
Async version of Delete last message for a key.
llama-index-integrations/storage/chat_store/llama-index-storage-chat-store-gel/llama_index/storage/chat_store/gel/base.py