CREATE TABLE product_images (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    product_id BIGINT UNSIGNED NOT NULL,
    image_path VARCHAR(255) NOT NULL,
    sort_order INT NOT NULL DEFAULT 0,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT fk_product_images_product FOREIGN KEY (product_id) REFERENCES products(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE INDEX idx_product_images_product ON product_images (product_id, sort_order);