for database

install flask-sqlalchemy

pip install flask-sqlalchemy

TO configure sqlalchemy

app.config['SQLALCHEMY_DATABASE_URI'] = "sqlite:///form.db"
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False 

#To set a database to app

to set database with app you need to create a sqllite database

python
from app import db
db.create_all()
exit()

to show database contant

upload your database to this website view database