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Works fine in dev. Under real load, timeouts start, all blaming a connection pool that's out of connections.
What you'll have at the end
A load test that holds steady at your target concurrency without a single pool-timeout error
You need
A FastAPI service running on SQLAlchemy's default connection pool against Postgres, already serving real traffic or a staging environment you can point a load test at, with at least one endpoint that calls another service partway through handling a request.
Not covered
Multiplying this pool across many horizontally scaled app instances, or putting an external pooler like PgBouncer in front of the database; this recipe covers one instance's own pool and how long it holds each connection.
Leans on
Checked 18 Aug 2026
Part of the ORM and Database Abstraction Tools cookbook