error in pytest sqlalchemy.exc.InterfaceError

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FAILED tests/test_users.py::test_get_all_users - sqlalchemy.exc.InterfaceError: (sqlalchemy.dialects.postgresql.asyncpg.InterfaceError) : cannot perform operation: another ope...
FAILED tests/test_users.py::test_get_user_by_id - sqlalchemy.exc.InterfaceError: (sqlalchemy.dialects.postgresql.asyncpg.InterfaceError) : cannot perform operation: another ope...

db.py
```
from typing import AsyncGenerator

from sqlalchemy import NullPool
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine

from config import settings

engine = create_async_engine(settings.db.url)
async_session_maker = async_sessionmaker(
bind=engine, class_=AsyncSession, expire_on_commit=False
)

async def get_async_session() -> AsyncGenerator[AsyncSession, None]:
async with async_session_maker() as session:
yield session

test_engine = create_async_engine(settings.db.test_url, poolclass=NullPool)
test_async_session_maker = async_sessionmaker(
bind=test_engine, class_=AsyncSession, expire_on_commit=False
)

async def get_test_async_session() -> AsyncGenerator[AsyncSession, None]:
async with test_async_session_maker() as session:
yield session
```

conftest.py
```
import pytest_asyncio
from httpx import ASGITransport, AsyncClient
from sqlalchemy.exc import IntegrityError
from sqlalchemy.ext.asyncio import AsyncSession

from app import app
from core.database import get_async_session, get_test_async_session, test_engine
from core.database.models import Base

@pytest_asyncio.fixture(scope="function")
async def init_db():
async with test_engine.begin() as conn:
await conn.run_sync(Base.metadata.create_all)
yield
async with test_engine.begin() as conn:
await conn.run_sync(Base.metadata.drop_all)

@pytest_asyncio.fixture(scope="function")
async def session(init_db) -> AsyncSession:
async for session in get_test_async_session():
try:
yield session
except IntegrityError:
await session.rollback()
raise
finally:
await session.rollback()
await session.close()

@pytest_asyncio.fixture(scope="function")
async def client(init_db) -> AsyncClient:
async def override_get_async_session():
async for session in get_test_async_session():
yield session

app.dependency_overrides[get_async_session] = override_get_async_session

transport = ASGITransport(app=app)
client = AsyncClient(transport=transport, base_url="http://testserver/api/v1")
yield client
await client.aclose()

async def user_authentication_headers(client: AsyncClient, username: str, password: str):
json = {"username": username, "password": password}
response = await client.post("/users/login", json=json)
data = response.json()
auth_token = data["access_token"]
headers = {"Authorization": f"Bearer {auth_token}"}
return headers
```

test_users.py
```
@pytest.mark.asyncio
async def test_get_all_users(client: AsyncClient, session: AsyncSession):
UserFactory._meta.sqlalchemy_session = session
superuser = UserFactory(is_superuser=True)
session.add(superuser)
await session.commit()

headers = await user_authentication_headers(client, superuser.username, "password123")
response = await client.get(
"/users",
headers=headers
)
assert response.status_code == 200
data = response.json()
assert isinstance(data, list)

@pytest.mark.asyncio
async def test_get_user_by_id(client: AsyncClient, session: AsyncSession):
UserFactory._meta.sqlalchemy_session = session
user = UserFactory(username="singleuser", is_active=True)
session.add(user)
await session.commit()

headers = await user_authentication_headers(client, user.username, "password123")
response = await client.get(
f"/users/{user.id}",
headers=headers
)
assert response.status_code == 200
data = response.json()
assert data["username"] == "singleuser"
```

Start by running tests/test_users.py and compare the async session setup in db.py with the fixtures and dependency override in conftest.py. Focus on the failing test_get_all_users and test_get_user_by_id cases. Done means both tests complete without sqlalchemy.exc.InterfaceError.

Written by the indexing model from the issue text.