Fix https://huntr.dev/bounties/ea181323-51f8-46a2-a60f-6a401907feb7/

app/Repositories/Budget/AvailableBudgetRepositoryInterface.php

@@ -56,6 +56,13 @@ interface AvailableBudgetRepositoryInterface
      */
     public function find(TransactionCurrency $currency, Carbon $start, Carbon $end): ?AvailableBudget;
 
+    /**
+     * @param int $id
+     *
+     * @return AvailableBudget|null
+     */
+    public function findById(int $id): ?AvailableBudget;
+
     /**
      * Return a list of all available budgets (in all currencies) (for the selected period).
      *