Better user group management and object observers

app/Events/Model/PiggyBank/ChangedAmount.php

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+<?php
+
+/*
+ * ChangedPiggyBankAmount.php
+ * Copyright (c) 2023 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Events\Model\PiggyBank;
+
+use FireflyIII\Events\Event;
+use FireflyIII\Models\PiggyBank;
+use FireflyIII\Models\TransactionGroup;
+use FireflyIII\Models\TransactionJournal;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Facades\Log;
+
+/**
+ * Class ChangedAmount
+ */
+class ChangedAmount extends Event
+{
+    use SerializesModels;
+
+    public string              $amount;
+    public PiggyBank           $piggyBank;
+    public ?TransactionGroup   $transactionGroup;
+    public ?TransactionJournal $transactionJournal;
+
+    /**
+     * Create a new event instance.
+     *
+     * @param PiggyBank               $piggyBank
+     * @param string                  $amount
+     * @param TransactionJournal|null $transactionJournal
+     * @param TransactionGroup|null   $transactionGroup
+     */
+    public function __construct(PiggyBank $piggyBank, string $amount, ?TransactionJournal $transactionJournal, ?TransactionGroup $transactionGroup)
+    {
+        Log::debug(sprintf('Created piggy bank event for piggy bank #%d with amount %s', $piggyBank->id, $amount));
+        $this->piggyBank          = $piggyBank;
+        $this->transactionJournal = $transactionJournal;
+        $this->transactionGroup   = $transactionGroup;
+        $this->amount             = $amount;
+    }
+}