app.py -- Initialize the Flask application, database session, and appbuilder object.
config.py -- Configure application settings such as the database URI, secret key, etc.
models.py -- SQLAlchemy model classes (database tables) generated by sqlacodegen.
views.py -- Flask-AppBuilder views that provide CRUD web interfaces for the models.

Setup

Generate a random SECRET_KEY for use in config.py:

python -c 'import secrets; print(secrets.token_hex())'

Create an admin user before running for the first time:

flask fab create-admin

Running

Start a local dev server with debugging and reloading:

flask run --debug