in user.py which is in resources directory you can find the endpoint to send email
I used only (user.py , store.py) from resources directory to authenticate with JWT
And there some addition configuration in app.py
The changes are made in app.py and the Migrate will be responsible of creating and updating tables.
flask db init
flask db migrate
flask db upgrade
STORE and TAG relationship is ONETOMANY
ITEM and TAG relationship is MANYTOMANY
if you dont have any database it will use SQLite by default