Add routine that caches account balances. Add it to the /flush routine as well.

app/Console/Commands/Correction/CorrectBalanceAmounts.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace FireflyIII\Console\Commands\Correction;
+
+use DB;
+use FireflyIII\Models\AccountBalance;
+use FireflyIII\Models\Transaction;
+use Illuminate\Console\Command;
+use stdClass;
+
+/**
+ * Class CorrectionSkeleton
+ * TODO DONT FORGET TO ADD THIS TO THE DOCKER BUILD
+ */
+class CorrectBalanceAmounts extends Command
+{
+    protected $description = 'Recalculate all account balance amounts';
+
+    protected $signature = 'firefly-iii:correct-balance-amounts';
+
+    /**
+     * @return int
+     */
+    public function handle(): int
+    {
+        $this->correctBalanceAmounts();
+
+
+        return 0;
+    }
+
+    private function correctBalanceAmounts(): void
+    {
+        $result = Transaction
+            ::groupBy(['account_id', 'transaction_currency_id'])
+            ->get(['account_id', 'transaction_currency_id', DB::raw('SUM(amount) as amount_sum')]);
+        /** @var stdClass $entry */
+        foreach ($result as $entry) {
+            $account  = (int) $entry->account_id;
+            $currency = (int) $entry->transaction_currency_id;
+            $sum      = $entry->amount_sum;
+
+            AccountBalance::updateOrCreate(
+                ['account_id' => $account, 'transaction_currency_id' => $currency],
+                ['balance' => $sum]
+            );
+        }
+    }
+}

app/Console/Commands/Correction/CorrectDatabase.php

@@ -74,6 +74,7 @@ class CorrectDatabase extends Command
             'firefly-iii:unify-group-accounts',
             'firefly-iii:trigger-credit-recalculation',
             'firefly-iii:migrate-preferences',
+            'firefly-iii:correct-balance-amounts',
         ];
         foreach ($commands as $command) {
             $this->friendlyLine(sprintf('Now executing command "%s"', $command));

app/Handlers/Observer/TransactionObserver.php

@@ -23,7 +23,10 @@ declare(strict_types=1);
 
 namespace FireflyIII\Handlers\Observer;
 
+use DB;
+use FireflyIII\Models\AccountBalance;
 use FireflyIII\Models\Transaction;
+use stdClass;
 
 /**
  * Class TransactionObserver
@@ -35,4 +38,20 @@ class TransactionObserver
         app('log')->debug('Observe "deleting" of a transaction.');
         $transaction?->transactionJournal?->delete();
     }
+
+    public function updated(Transaction $transaction): void
+    {
+        app('log')->debug('Observe "updated" of a transaction.');
+        // refresh account balance:
+        /** @var stdClass $result */
+        $result = Transaction::groupBy(['account_id', 'transaction_currency_id'])->where('account_id', $transaction->account_id)->first(['account_id', 'transaction_currency_id', DB::raw('SUM(amount) as amount_sum')]);
+        if (null !== $result) {
+            $account  = (int) $result->account_id;
+            $currency = (int) $result->transaction_currency_id;
+            $sum      = $result->amount_sum;
+
+            AccountBalance::updateOrCreate(['account_id' => $account, 'transaction_currency_id' => $currency], ['balance' => $sum]);
+        }
+
+    }
 }

app/Http/Controllers/DebugController.php

@@ -86,14 +86,15 @@ class DebugController extends Controller
     {
         app('preferences')->mark();
         $request->session()->forget(['start', 'end', '_previous', 'viewRange', 'range', 'is_custom_range', 'temp-mfa-secret', 'temp-mfa-codes']);
-        app('log')->debug('Call cache:clear...');
 
         Artisan::call('cache:clear');
-        app('log')->debug('Call config:clear...');
         Artisan::call('config:clear');
-        app('log')->debug('Call route:clear...');
         Artisan::call('route:clear');
-        app('log')->debug('Call twig:clean...');
+        Artisan::call('view:clear');
+
+        // also do some recalculations.
+        Artisan::call('firefly-iii:correct-balance-amounts');
+        Artisan::call('firefly-iii:trigger-credit-recalculation');
 
         try {
             Artisan::call('twig:clean');
@@ -101,7 +102,6 @@ class DebugController extends Controller
             throw new FireflyException($e->getMessage(), 0, $e);
         }
 
-        app('log')->debug('Call view:clear...');
         Artisan::call('view:clear');
 
         return redirect(route('index'));

app/Models/AccountBalance.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace FireflyIII\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class AccountBalance extends Model
+{
+    protected $fillable = ['account_id', 'transaction_currency_id', 'balance'];
+    use HasFactory;
+}

database/migrations/2024_05_12_060551_create_account_balance_table.php

@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        if (!Schema::hasTable('account_balances')) {
+            Schema::create('account_balances', function (Blueprint $table) {
+                $table->id();
+                $table->timestamps();
+                $table->integer('account_id', false, true);
+                $table->integer('transaction_currency_id', false, true);
+                $table->decimal('balance', 32, 12);
+                $table->foreign('account_id')->references('id')->on('accounts')->onDelete('cascade');
+                $table->foreign('transaction_currency_id')->references('id')->on('transaction_currencies')->onDelete('cascade');
+                $table->unique(['account_id','transaction_currency_id'],'unique_account_currency');
+            });
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('account_balances');
+    }
+};