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   use Illuminate\Database\Migrations\Migration;
   use Illuminate\Database\Schema\Blueprint;
   use Illuminate\Support\Facades\Schema;

   class CreateSettingsTable extends Migration
   {
       public function up()
       {
           Schema::create('settings', function (Blueprint $table) {
               $table->id();
               $table->string('key')->unique();
               $table->string('value')->nullable();
               $table->timestamps();
           });
       }

       public function down()
       {
           Schema::dropIfExists('settings');
       }
   }

   php artisan migrate