
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Facades\DB as DB;
use App\Models\StockItem;
class AddPreviousRateToStockItemsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()