We use exactly this for windmill (OSS Retool alternative + modern airflow) and run benchmarks everyday. On a modest github CI instance where one windmill worker and postgres run as containers, our benchmarks run at 1200jobs/s. Workers can be added and it will scale gracefully up to 5000jobs/s. We are exploring using Citus to cross the barrier of 5000j/s on our multi-tenant instance.
https://github.com/windmill-labs/windmill/tree/benchmarks