activity is now added when contract balance is changed

app/Models/ContractSetting.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class ContractSetting extends Model
+{
+    protected $fillable = [
+        'create_activity_on_balance_change',
+        'default_action_id',
+        'default_decision_id',
+        'activity_note_template',
+    ];
+}