How to add property to PostgreSQL database that is hosted on Heroku with Flask/Python?

Solution

import os
from flask_script import Manager
from flask_migrate import Migrate, MigrateCommand

from app import app, db


app.config.from_object(os.environ['APP_SETTINGS'])

migrate = Migrate(app, db)
manager = Manager(app)

manager.add_command('db', MigrateCommand)

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

$ python manage.py db init

$ python manage.py db migrate

$ python manage.py db upgrade