This change wires flask_sqlalchemy into flask_app.py and configures a MySQL connection, including pool recycle and SQLAlchemy settings. It’s an important step toward replacing the app’s current in-memory data structures with persistent storage that survives restarts and supports real deployments. One notable concern is that the database credentials are committed directly in code, so the next practical improvement should be moving them into environment-based configuration. Overall, this sets up the foundation for storing application data durably.