app_custom_directory.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///app.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

db = SQLAlchemy(app)
migrate = Migrate(app, db, directory='temp_folder/temp_migrations')


class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(128))


@app.cli.command()
def add():
    """Add test user."""
    db.session.add(User(name='test'))
    db.session.commit()


if __name__ == '__main__':
    app.run()