CREATE TABLE IF NOT EXISTS ratings (
    id SERIAL PRIMARY KEY,
    restaurant_id INT NOT NULL,
    user_id INT NOT NULL,
    rating INT NOT NULL,
    review TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (restaurant_id) REFERENCES restaurants(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);