Import reflected Flask-SQLAlchemy Module before creating the app - sqlalchemy

Question

This is a continuation of this question.
As my flask app should not write anything in my database, I set up Flask-SQLAlchemy to reflect my database. This way I do not have to change my models, when I change my schema:
# app/__init__.py
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
def create_app():
app = Flask(__name__)
db.init_app(app)
with app.app_context():
db.Model.metadata.reflect(db.engine)
# app/models.py
from app import db
class Data(db.Model):
__table__ = db.Model.metadata.tables['data']
But now, if I have to import the Model before I created the app, I run into Errors because the metadata is not set yet. This is a problem when it comes to testing for example:
# test.py
import unittest
from app import create_app, db
from app.models import Data
class TestGUI(unittest.TestCase):
#classmethod
def setUpClass(cls):
cls.app = create_app()
# etc ...
This throws KeyError: 'data' in __table__ = db.Model.metadata.tables['data'] when importing from app.models as the metadata is not correctly set before the create_app() function is run.

Answer 1

I did find a solution (thanks to #snakecharmerb). The solution is simply to avoid the problem, to not import app.models before running create_app(). A bit hacky, so feel free to post an answer as well, when you have a better solution.
My test file now looks like this:
# test.py
import unittest
from app import create_app, db
app = create_app()
from app.models import Data
class TestGUI(unittest.TestCase):
#classmethod
def setUpClass(cls):
cls.app = app
# etc ...