-- Create order_items table
CREATE TABLE IF NOT EXISTS order_items (
    id INT AUTO_INCREMENT PRIMARY KEY,
    order_id INT NOT NULL,
    product_id INT NOT NULL,
    quantity INT NOT NULL,
    unit_price DECIMAL(10, 2) NOT NULL,
    line_total DECIMAL(10, 2) NOT NULL,
    supplier_id INT,
    delivery_source VARCHAR(50),
    FOREIGN KEY (order_id) REFERENCES orders(id),
    FOREIGN KEY (product_id) REFERENCES products(id)
);