lmfdb VS Flask-SocketIO-Chat

The LMFDB (https://github.com/lmfdb/lmfdb) is flask-based, with millions of pages reflecting millions of mathematical objects. The route backend is separated into parametrized blueprints. This is a sufficiently old and large project that it is obvious that different parts were written by different people with different points of view, but the underlying flask skeleton is fairly straightforward.

Reddit uses flask as part of its backend (according to stackshare.io) if you want one of the ultimate examples, but if you want to learn reddit is probably not the best example. For splitting up your routes, you need to make a module and import your filles from each other from there to split it up, so you will need to declare a __init__.py file. like this example (I know you said you didn't want them but tehy are the best example to show you).

As usual, Miguel Grinberg has an example: https://github.com/miguelgrinberg/Flask-SocketIO-Chat

I think this worth another thread, I decided to do blueprint this app to another one. Can flask-socketio run in a single blueprint or must be run in the main app where i use the command socketio.run(app) ? I'm seeing this example and still learning on it