Add marker. Seems fastest solution.

app/Rules/UniqueAccountNumber.php

@@ -41,7 +41,8 @@ class UniqueAccountNumber implements ValidationRule
      */
     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');
     }
 
     /**
@@ -129,8 +130,7 @@ class UniqueAccountNumber implements ValidationRule
                             ->where('accounts.user_id', auth()->user()->id)
                             ->where('account_types.type', $type)
                             ->where('account_meta.name', '=', 'account_number')
-            ->where('account_meta.data', json_encode($accountNumber))
-        ;
+                            ->where('account_meta.data', json_encode($accountNumber));
 
         if (null !== $this->account) {
             $query->where('accounts.id', '!=', $this->account->id);