This a minimal sample code utilize the following modules
flask flask-sqlalchemy flask-script
model.py stores the DB model and manage the DB with flask-script module, to initialize/update the database structure:
python model.py db init
python model.py db migrate
python model.py db upgrade
model_query.py demostrates how to query, insert, update, delete records with flask-sqlalchemy
myconfig.py demostrates how to switch between Development and Production settings
python app.py run
starts web application to load entries in the database
flask-bootstrap is not used due to maintenance outdated as the time written this code, bootstrap 4.1 links are hard-copied from getbootstrap.com