Better user group management and object observers

app/Handlers/Observer/PiggyBankObserver.php

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+<?php
+/*
+ * PiggyBankObserver.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\Handlers\Observer;
+
+use FireflyIII\Models\PiggyBank;
+use FireflyIII\Models\PiggyBankRepetition;
+
+/**
+ * Class PiggyBankObserver
+ */
+class PiggyBankObserver
+{
+    /**
+     * @param PiggyBank $piggyBank
+     *
+     * @return void
+     */
+    public function created(PiggyBank $piggyBank): void
+    {
+        app('log')->debug('Observe "created" of a piggy bank.');
+        $repetition = new PiggyBankRepetition();
+        $repetition->piggyBank()->associate($piggyBank);
+        $repetition->startdate     = $piggyBank->startdate;
+        $repetition->targetdate    = $piggyBank->targetdate;
+        $repetition->currentamount = 0;
+        $repetition->save();
+    }
+
+    /**
+     * Also delete related objects.
+     *
+     * @param PiggyBank $piggyBank
+     *
+     * @return void
+     */
+    public function deleting(PiggyBank $piggyBank): void
+    {
+        app('log')->debug('Observe "deleting" of a piggy bank.');
+
+        foreach ($piggyBank->attachments()->get() as $attachment) {
+            $attachment->delete();
+        }
+
+        $piggyBank->piggyBankEvents()->delete();
+        $piggyBank->piggyBankRepetitions()->delete();
+
+        $piggyBank->notes()->delete();
+    }
+
+}