First of all thank you for your response, it is NOT broken, when I wrote this article I wrote quickly and I forgot to remove the async coroutines for endpoints (sorry about that I removed it later).
The whole purpose of this article was to show how to use Alembic with FastAPI, the rest (SQL-alchemy. and Docker) were just a supplement to that. I am planning to write another article focusing on handling the databases asynchronously.
so stay tuned