use uuid for all tables

app/Models/Holding.php

@@ -4,11 +4,13 @@ namespace App\Models;
 
 use App\Models\Dividend;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Concerns\HasUuids;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 
 class Holding extends Model
 {
     use HasFactory;
+    use HasUuids;
 
     protected $with = [];