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Graph/355ea9b9-7eef-4602-a1f2-411ab2e752fb

Problemunvalidated

self._session = aiohttp.ClientSession() — from .singletons import SINGLETONS. Outcome: You can benefit from the lazy initialization inside the `startup` event.

355ea9b9-7eef-4602-a1f2-411ab2e752fb

self._session = aiohttp.ClientSession() — from .singletons import SINGLETONS. Outcome: You can benefit from the lazy initialization inside the startup event.

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Updated4/30/2026

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CAUSED_BYRootCause

self._session = aiohttp.ClientSession(). Tension: needs to be created within an active event loop. Outcome: created within an active event loop.

PERTAIN_TODomain

PERTAIN_TODomain

Async Programming

PERTAIN_TODomain

FIXED_BYSolution

use `Session` objects from Python `requests` library — in order to persist cookies across requests. Outcome: s = requests.Session().

FIXED_BYSolution

You can benefit from the lazy initialization inside the `startup` event. Outcome: async def startup_event(): await SINGLETON.initialize().

FIXED_BYSolution

I'd like to use `AsyncSession.sync_session` — async def get_session() -> AsyncSession: session = SessionLocal(). Tension: the code below fails with error. Outcome: use `AsyncSession.sync_session` but the code below fails with error.

FIXED_BYSolution

Session() — sessionmaker(bind=self.engine).

FIXED_BYSolution

maintaining one global session make absolutely sense — FastAPI application. Tension: Every `boto3.Session()` call is costing me 50ms-100ms in latency. Outcome: session = boto3.Session() # ← global reusable boto3 session.

Shared Async State Control

Singleton Client Reuse

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