Implementa revisao de adjudicacoes e navegacao partilhada do SGC

app/Models/PurchaseControlPolicy.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Concerns\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+
+/** @property int $id
+ * @property int $tenant_id
+ * @property int $created_by
+ * @property int $revision
+ * @property string $status
+ */
+class PurchaseControlPolicy extends Model
+{
+    use BelongsToTenant;
+
+    protected $guarded = ['id'];
+
+    protected $attributes = ['status' => 'pending'];
+
+    protected function casts(): array
+    {
+        return ['enabled' => 'boolean'];
+    }
+
+    protected static function booted(): void
+    {
+        static::updating(function (PurchaseControlPolicy $policy) {
+            if ($policy->getRawOriginal('status') !== 'pending' || array_diff(array_keys($policy->getDirty()), ['status', 'decided_at', 'updated_at']) !== []) {
+                throw new \LogicException('Preservar a política e as decisões.');
+            }
+        });
+        static::deleting(fn () => throw new \LogicException('Preservar versões de política.'));
+    }
+}