Terminate function does not work when a stream is cancelled prematurely when in an anyio task group

Chưa có ai nhận issue này.

* **asyncpg version**: 0.29.0
* **PostgreSQL version**: 14.10
* **Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
the issue with a local PostgreSQL install?**: Yes, I can reproduce it locally
* **Python version**: 3.12
* **Platform**: linux and Mac OS
* **Do you use pgbouncer?**: No
* **Did you install asyncpg with pip?**: Yes
* **If you built asyncpg locally, which version of Cython did you use?**: n/a
* **Can the issue be reproduced under both asyncio and
[uvloop](https://github.com/magicstack/uvloop)?**: No, the issue is not producible with asyncio only with anyio

Hi, I have a Fast API application that uses `SQLAlchemy` and `asyncpg`. I opened up a discussion on the SQLAlchemy page [here (full discussion)](https://github.com/sqlalchemy/sqlalchemy/discussions/11128#discussion-6343846) reporting a major problem that affected my application after an update they released.

To summarize the problem and what we concluded in that discussion,

I asynchronously stream data from my API to a client using the `starlette` `StreamingResponse` class which takes advantage of`anyio` under the hood. For some reason when the `anyio` `task group` gets cancelled before the stream is finished the `asyncpg` `terminate` function does not terminate the connection when the `close` function is used first, leaving it stuck in an `idle in transaction` state. This causes connections to run up eventually stopping other applications from creating new connections.

With some help from the SQLAlchemy folks, after some time working through the problem we were able to reproduce a small example of my problem using only the `asyncpg` and `anyio` libraries [here (Example of problem)](https://github.com/sqlalchemy/sqlalchemy/discussions/11128#discussioncomment-9539469)

Any help resolving this issue would be greatly appreciated! If you need any more info from me please do not hesitate to message back

Thanks in advance!

Bản tái hiện tối thiểu được liên kết trong phần thảo luận của SQLAlchemy; trước tiên hãy chạy nó với thiết lập asyncpg và anyio được báo cáo, rồi theo dõi đường dẫn close-then-terminate trong quá trình hủy nhóm tác vụ. Sử dụng các entry point terminate và close của asyncpg để xác định vị trí xử lý vòng đời kết nối. Hoàn tất khi một stream bị hủy không còn để kết nối ở trạng thái idle in transaction.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.