Error message when program is closed：sqlalchemy.pool.impl.NullPool

[WTSRUVF]

Bug summary

When I execute the program in the documentation, this error is sometimes reported after the program is executed.

code

from prefect import flow, task

@task
def say_hello(name):
    return f"Hello {name}!"

@task
def print_result(result):
    print(type(result))
    print(result)

@flow(name="hello-flow")
def hello_world():
    future = say_hello.submit("Marvin")
    print_result.submit(future).wait()

hello_world()

error

20:29:07.002 | ERROR   | sqlalchemy.pool.impl.NullPool - Exception closing connection <AdaptedConnection <Connection(Thread-16, started daemon 139909163644608)>>
Traceback (most recent call last):
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/pool/base.py", line 376, in _close_connection
    self._dialect.do_close(connection)
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line 708, in do_close
    dbapi_connection.close()
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/dialects/sqlite/aiosqlite.py", line 275, in close
    self.await_(self._connection.close())
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/util/_concurrency_py3k.py", line 132, in await_only
    return current.parent.switch(awaitable)  # type: ignore[no-any-return,attr-defined] # noqa: E501
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/util/_concurrency_py3k.py", line 196, in greenlet_spawn
    value = await result
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/aiosqlite/core.py", line 178, in close
    await self._execute(self._conn.close)
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/aiosqlite/core.py", line 132, in _execute
    return await future
asyncio.exceptions.CancelledError

If DaskTaskRunner is used, the following error is reported.

14:25:36.839 | ERROR   | sqlalchemy.pool.impl.NullPool - Exception during reset or similar
Traceback (most recent call last):
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/pool/base.py", line 986, in _finalize_fairy
    fairy._reset(
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/pool/base.py", line 1432, in _reset
    pool._dialect.do_rollback(self)
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line 699, in do_rollback
    dbapi_connection.rollback()
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/dialects/sqlite/aiosqlite.py", line 263, in rollback
    self.await_(self._connection.rollback())
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/util/_concurrency_py3k.py", line 132, in await_only
    return current.parent.switch(awaitable)  # type: ignore[no-any-return,attr-defined] # noqa: E501
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/sqlalchemy/util/_concurrency_py3k.py", line 196, in greenlet_spawn
    value = await result
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/aiosqlite/core.py", line 169, in rollback
    await self._execute(self._conn.rollback)
  File "/root/.pyenv/versions/3.9.16/lib/python3.9/site-packages/aiosqlite/core.py", line 132, in _execute
    return await future
asyncio.exceptions.CancelledError

Version info

Version:             3.1.10
API version:         0.8.4
Python version:      3.9.16
Git commit:          b11b56fc
Built:               Tue, Dec 24, 2024 10:58 PM
OS/Arch:             linux/x86_64
Profile:             ephemeral
Server type:         ephemeral
Pydantic version:    2.10.4
Server:
  Database:          sqlite
  SQLite version:    3.45.1

Additional context

Package                   Version
------------------------- -----------
aiosqlite                 0.20.0
alembic                   1.14.0
amqp                      5.3.1
annotated-types           0.7.0
anyio                     4.7.0
apprise                   1.9.1
APScheduler               3.11.0
asgi-lifespan             2.1.0
async-timeout             5.0.1
asyncpg                   0.30.0
attrs                     24.3.0
bce-python-sdk            0.9.25
beautifulsoup4            4.12.3
billiard                  4.2.1
blinker                   1.9.0
bs4                       0.0.2
cachetools                5.5.0
celery                    5.4.0
certifi                   2024.12.14
cffi                      1.17.1
charset-normalizer        3.4.1
click                     8.1.8
click-didyoumean          0.3.1
click-plugins             1.1.1
click-repl                0.3.0
cloudpickle               3.1.0
colorama                  0.4.6
coolname                  2.2.0
croniter                  3.0.4
cryptography              44.0.0
dask                      2024.8.0
dateparser                1.2.0
Deprecated                1.2.15
distributed               2024.8.0
docker                    7.1.0
exceptiongroup            1.2.2
fastapi                   0.115.6
Flask                     3.1.0
Flask-SQLAlchemy          3.1.1
fsspec                    2024.12.0
future                    1.0.0
graphviz                  0.20.3
greenlet                  3.1.1
griffe                    1.5.1
h11                       0.14.0
h2                        4.1.0
hpack                     4.0.0
httpcore                  1.0.7
httpx                     0.28.1
humanize                  4.11.0
hyperframe                6.0.1
idna                      3.10
importlib_metadata        8.5.0
itsdangerous              2.2.0
jieba                     0.42.1
Jinja2                    3.1.5
jinja2-humanize-extension 0.4.0
joblib                    1.4.2
jsonpatch                 1.33
jsonpointer               3.0.0
jsonschema                4.23.0
jsonschema-specifications 2024.10.1
kombu                     5.4.2
Levenshtein               0.26.1
locket                    1.0.0
lxml                      5.2.2
Mako                      1.3.8
Markdown                  3.7
markdown-it-py            3.0.0
MarkupSafe                3.0.2
mdurl                     0.1.2
msgpack                   1.1.0
nltk                      3.9.1
numpy                     2.0.2
oauthlib                  3.2.2
opentelemetry-api         1.29.0
orjson                    3.10.12
packaging                 24.2
pandas                    2.2.3
partd                     1.4.2
pathspec                  0.12.1
pendulum                  3.0.0
pip                       22.0.4
prefect                   3.1.10
prefect-dask              0.3.2
prometheus_client         0.21.1
prompt_toolkit            3.0.48
psutil                    6.1.1
py4j                      0.10.9.7
pycparser                 2.22
pycrypto                  2.6.1
pycryptodome              3.21.0
pydantic                  2.10.4
pydantic_core             2.27.2
pydantic-extra-types      2.10.1
pydantic-settings         2.7.0
Pygments                  2.18.0
PyMySQL                   1.1.1
pyspark                   3.5.4
python-dateutil           2.9.0.post0
python-dotenv             1.0.1
python-Levenshtein        0.26.1
python-slugify            8.0.4
python-socks              2.5.3
pytz                      2024.2
PyYAML                    6.0.2
RapidFuzz                 3.11.0
readchar                  4.2.1
redis                     5.2.1
referencing               0.35.1
regex                     2024.11.6
requests                  2.32.3
requests-oauthlib         2.0.0
rfc3339-validator         0.1.4
rich                      13.9.4
rpds-py                   0.22.3
ruamel.yaml               0.18.6
ruamel.yaml.clib          0.2.12
setuptools                58.1.0
shellingham               1.5.4
six                       1.17.0
sniffio                   1.3.1
sortedcontainers          2.4.0
soupsieve                 2.6
SQLAlchemy                2.0.36
starlette                 0.41.3
tblib                     3.0.0
text-unidecode            1.3
time-machine              2.16.0
timeout-decorator         0.5.0
toml                      0.10.2
toolz                     1.0.0
tornado                   6.4.2
tqdm                      4.67.1
typer                     0.12.5
typing_extensions         4.12.2
tzdata                    2024.2
tzlocal                   5.2
ujson                     5.10.0
urllib3                   2.3.0
uvicorn                   0.34.0
vine                      5.1.0
wcwidth                   0.2.13
websockets                13.1
Werkzeug                  3.1.3
wrapt                     1.17.0
zhon                      2.1.1
zict                      3.0.0
zipp                      3.21.0