Don't allow NodeStatisticsJob to be in the queue multiple times (#664)

* Make job unique

* Pint fix

app/Jobs/NodeStatistics.php

@@ -4,26 +4,16 @@ namespace App\Jobs;
 
 use App\Models\Node;
 use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldBeUnique;
 use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Foundation\Bus\Dispatchable;
 use Illuminate\Queue\InteractsWithQueue;
 use Illuminate\Queue\SerializesModels;
 
-class NodeStatistics implements ShouldQueue
+class NodeStatistics implements ShouldBeUnique, ShouldQueue
 {
     use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
 
-    /**
-     * Create a new job instance.
-     */
-    public function __construct()
-    {
-        //
-    }
-
-    /**
-     * Execute the job.
-     */
     public function handle(): void
     {
         foreach (Node::all() as $node) {