nopaque/app/settings/tasks.py

from .. import db
from ..decorators import background
from ..models import User


@background
def delete_user(user_id, *args, **kwargs):
    with kwargs['app'].app_context():
        user = User.query.get(user_id)
        if user is None:
            raise Exception(f'User {user_id} not found')
        user.delete()
        db.session.commit()