Move the model callbacks into Observables; reduce caching since it held balances incorrectly

app/Providers/AppServiceProvider.php

@@ -1,6 +1,19 @@
 <?php
+
 namespace App\Providers;
 
+use App\Models\Aircraft;
+use App\Models\Airport;
+use App\Models\Journal;
+use App\Models\JournalTransaction;
+use App\Models\Observers\AircraftObserver;
+use App\Models\Observers\AirportObserver;
+use App\Models\Observers\JournalObserver;
+use App\Models\Observers\JournalTransactionObserver;
+use App\Models\Observers\PirepFieldObserver;
+use App\Models\Observers\SettingObserver;
+use App\Models\PirepField;
+use App\Models\Setting;
 use App\Repositories\SettingRepository;
 use App\Services\ModuleService;
 use Illuminate\Support\Facades\Schema;
@@ -15,6 +28,14 @@ class AppServiceProvider extends ServiceProvider
         $this->app->bind('setting', SettingRepository::class);
 
         View::share('moduleSvc', app(ModuleService::class));
+
+        // Model observers
+        Aircraft::observe(AircraftObserver::class);
+        Airport::observe(AirportObserver::class);
+        Journal::observe(JournalObserver::class);
+        JournalTransaction::observe(JournalTransactionObserver::class);
+        PirepField::observe(PirepFieldObserver::class);
+        Setting::observe(SettingObserver::class);
     }
 
     /**