Added achievement data

app/Observers/AirlineObserver.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\Achievement;
+use App\Models\Airline;
+use App\Models\Alliance;
+
+class AirlineObserver
+{
+    public function created(Airline $airline): void
+    {
+        if ($airline->alliance_id !== null) {
+            $this->syncAllianceThresholds();
+        }
+    }
+
+    public function updated(Airline $airline): void
+    {
+        if ($airline->wasChanged('alliance_id')) {
+            $this->syncAllianceThresholds();
+        }
+    }
+
+    public function deleted(Airline $airline): void
+    {
+        $this->syncAllianceThresholds();
+    }
+
+    private function syncAllianceThresholds(): void
+    {
+        Alliance::withCount('airlines')->each(function (Alliance $alliance) {
+            Achievement::where('internal_name', "airlines_alliances.all_{$alliance->internal_name}")
+                ->update(['threshold' => $alliance->airlines_count]);
+        });
+    }
+}