chore: bootstrap module from working instance and add install guide

models/DonationWebhookEvent.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace humhub\modules\donations\models;
+
+use humhub\components\ActiveRecord;
+
+class DonationWebhookEvent extends ActiveRecord
+{
+    public static function tableName()
+    {
+        return 'rescue_donation_webhook_event';
+    }
+
+    public function rules()
+    {
+        return [
+            [['provider', 'provider_event_id'], 'required'],
+            [['is_processed'], 'integer'],
+            [['payload_json'], 'string'],
+            [['provider'], 'string', 'max' => 32],
+            [['provider_event_id'], 'string', 'max' => 190],
+            [['event_type'], 'string', 'max' => 120],
+            [['provider', 'provider_event_id'], 'unique', 'targetAttribute' => ['provider', 'provider_event_id']],
+        ];
+    }
+
+    public function beforeSave($insert)
+    {
+        if (!parent::beforeSave($insert)) {
+            return false;
+        }
+
+        if ($insert && empty($this->created_at)) {
+            $this->created_at = date('Y-m-d H:i:s');
+        }
+
+        if ($this->is_processed === null) {
+            $this->is_processed = 0;
+        }
+
+        return true;
+    }
+}