Add marker. Seems fastest solution.

app/Rules/UniqueAccountNumber.php

@@ -33,15 +33,16 @@ use Illuminate\Contracts\Validation\ValidationRule;
  */
 class UniqueAccountNumber implements ValidationRule
 {
-    private ?Account    $account;
+    private ?Account $account;
-    private ?string         $expectedType;
+    private ?string  $expectedType;
 
     /**
      * Create a new rule instance.
      */
     public function __construct(?Account $account, ?string $expectedType)
     {
-        app('log')->debug('Constructed UniqueAccountNumber');
+        app('log')
+            ->debug('Constructed UniqueAccountNumber');
         $this->account      = $account;
         $this->expectedType = $expectedType;
         // a very basic fix to make sure we get the correct account type:
@@ -62,7 +63,7 @@ class UniqueAccountNumber implements ValidationRule
      */
     public function message(): string
     {
-        return (string)trans('validation.unique_account_number_for_user');
+        return (string) trans('validation.unique_account_number_for_user');
     }
 
     /**
@@ -125,12 +126,11 @@ class UniqueAccountNumber implements ValidationRule
     private function countHits(string $type, string $accountNumber): int
     {
         $query = AccountMeta::leftJoin('accounts', 'accounts.id', '=', 'account_meta.account_id')
-            ->leftJoin('account_types', 'account_types.id', '=', 'accounts.account_type_id')
+                            ->leftJoin('account_types', 'account_types.id', '=', 'accounts.account_type_id')
-            ->where('accounts.user_id', auth()->user()->id)
+                            ->where('accounts.user_id', auth()->user()->id)
-            ->where('account_types.type', $type)
+                            ->where('account_types.type', $type)
-            ->where('account_meta.name', '=', 'account_number')
+                            ->where('account_meta.name', '=', 'account_number')
-            ->where('account_meta.data', json_encode($accountNumber))
+                            ->where('account_meta.data', json_encode($accountNumber));
-        ;
 
         if (null !== $this->account) {
             $query->where('accounts.id', '!=', $this->account->id);