Implementa planeamento de compras com marcos e responsabilidades por empresa

app/Models/PurchasePlanMilestone.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Concerns\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+
+class PurchasePlanMilestone extends Model
+{
+    use BelongsToTenant;
+
+    protected $guarded = ['id'];
+
+    protected $attributes = ['version' => 1, 'actual_on' => null];
+
+    protected static function booted(): void
+    {
+        static::deleting(fn () => throw new \LogicException('Preservar marcos e datas anteriores na auditoria.'));
+    }
+}