// database/migrations/xxxx_create_order_items_table.php
public function up()
{
    Schema::create('order_items', function (Blueprint $table) {
        $table->id();
        $table->foreignId('order_id')->constrained()->onDelete('cascade');
        $table->foreignId('product_id')->constrained();
        $table->string('product_name');
        $table->decimal('price', 10, 2);
        $table->integer('quantity');
        $table->json('options')->nullable(); // e.g., size, framing
        $table->timestamps();
    });
}