__init__.py

# app/__init__.py
from flask_login import LoginManager
login_manager = LoginManager()
login_manager.session_protection = "strong"
login_manager.login_view = "auth.login

models.py

# app/auth/models.py
from flask_login import UserMixin

@login_manager.user_loader
def load_user(user_id):
  return User.get(int(user_id))
  
class User(UserMixin,db.Model):
  ...

views.py

# app/auth/views.py