I’m designing a flask app that will need to call a custom class to read a database and then initialize and load docker containers based on the information retrieved from the db (flask-SQLAlchemy). This class (object) will also need to be accessed by several different routes for re-configuring/controlling the docker containers

What is the best way to do this?

My initial thoughts were to make a seperate file (extensions.py) and do the initial instantiation of the class in that file. Then the main flask app and the routes would import the extensions.py file. I did this approach for my flask-SQLAlchemy db after watching this video:
https://www.youtube.com/watch?v=WhwU1-DLeVw

I would then pass the flask-SQLAlchemy db to my object after the flask app called the db.init_app(app) call to register the db.