Persist user cart across sessions

namespace App\Http\Controllers;

// removed imports for brevity

class CartController extends Controller
{
    protected $cartService;
    protected $pricingService;

    public function __construct(CartService $cartService, PricingService $pricingService)
    {
        $this->cartService = $cartService;
        $this->pricingService = $pricingService;

        // Listen for session regeneration events to transfer cart data
        Event::listen(SessionRegenerated::class, function ($event) {
            $oldSessionId = $event->old;
            $newSessionId = $event->session->getId();

            $cart = session()->get("cart_$oldSessionId");
            session()->put("cart_$newSessionId", $cart);
        });
    }

    // reduced code for simplicity
}

// schema for carts table

Schema::create('carts', function (Blueprint $table) {
    $table->id();
    $table->foreignId('user_id')->nullable()->constrained('users');
    $table->string('session_id')->nullable();
    $table->decimal('discount', 8, 2)->default(0);
    $table->decimal('tax', 8, 2)->default(0);
    $table->decimal('shipping_cost', 8, 2)->default(0);
    $table->timestamp('expires_at')->nullable();
    $table->timestamps();
});

i want to persist cart data across sessions so that reloading the page even after session has been regenerated user won't lose cart.