This is a Flask-based backend for a store management system with PostgreSQL database, configured for deployment on Koyeb.

• Product management (CRUD operations)
• Sales registration with stock control
• Expense tracking
• Reporting features (sales, profits)
• RESTful API design

• Python 3.10+
• Flask
• SQLAlchemy ORM
• PostgreSQL
• Flask-Migrate for database migrations
• Flask-CORS for cross-origin requests

1. Create a virtual environment:

   python -m venv venv
   source venv/bin/activate  # On Windows: venv\Scripts\activate

2. Install dependencies:

   pip install -r requirements.txt

3. Set up environment variables in a .env file:

   DATABASE_URL=postgresql://tienda_user:your_password@localhost:5432/tienda_db
   FLASK_ENV=development
   SECRET_KEY=your-secret-key-for-development

4. Initialize the database:

   flask db upgrade

5. Run the application:

   python app.py

The API will be available at http://localhost:5000.

• GET /api/productos - Get all products
• POST /api/productos - Create a new product

• POST /api/ventas - Register a new sale

• GET /api/reportes/ventas - Get sales report (optional date filters)
• GET /api/reportes/ganancias - Get profit report

1. Producto - Store products with name, price, and stock
2. Venta - Sales records with date and total amount
3. VentaProducto - Junction table for sales and products with quantities
4. Gasto - Expense tracking with description and amount

1. Create a Koyeb account at koyeb.com
2. Connect your GitHub account to Koyeb
3. Create a new Web Service:
   • Select your repository
   • Set the build command to: pip install -r requirements.txt
   • Set the run command to: gunicorn --bind 0.0.0.0:$PORT app:app
   • Add environment variables:
     • FLASK_ENV: production
     • SECRET_KEY: A long random string for security
     • DATABASE_URL: Your PostgreSQL connection string
4. If you don't have a PostgreSQL database, you can create one on Koyeb or use an external provider like Supabase or Render PostgreSQL.