app.py file

src/app.py

+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+
+app = Flask(__name__)
+
+# PostgreSQL database configuration
+app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://grocery_user:csc190@localhost/grocery_db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+
+db = SQLAlchemy(app)