Implement tenant announcements and audit log fixes

app/Models/TenantAnnouncementDelivery.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\TenantAnnouncementDeliveryStatus;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TenantAnnouncementDelivery extends Model
+{
+    protected $fillable = [
+        'tenant_announcement_id',
+        'tenant_id',
+        'channel',
+        'status',
+        'sent_at',
+        'failed_at',
+        'failure_reason',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => TenantAnnouncementDeliveryStatus::class,
+            'sent_at' => 'datetime',
+            'failed_at' => 'datetime',
+        ];
+    }
+
+    public function announcement(): BelongsTo
+    {
+        return $this->belongsTo(TenantAnnouncement::class, 'tenant_announcement_id');
+    }
+
+    public function tenant(): BelongsTo
+    {
+        return $this->belongsTo(Tenant::class);
+    }
+}