feat: add app and database modules

app/Models/Notification.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Prunable;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Notification extends Model
+{
+    use Prunable, SoftDeletes;
+
+    protected $table = 'system_notifications';
+
+    protected $fillable = [
+        'title',
+        'message',
+        'recipient',
+        'type',
+        'read_at',
+        'created_by',
+    ];
+
+    protected $casts = [
+        'read_at' => 'datetime',
+    ];
+
+    /**
+     * Get the user who created the notification.
+     */
+    public function creator()
+    {
+        return $this->belongsTo(User::class, 'created_by');
+    }
+
+    /**
+     * Users who have interacted with this notification (read/deleted).
+     */
+    public function users()
+    {
+        return $this->belongsToMany(User::class, 'notification_user')
+            ->withPivot('read_at', 'deleted_at')
+            ->withTimestamps();
+    }
+
+    /**
+     * Get the prunable model query.
+     * Auto-delete notifications older than 30 days.
+     */
+    public function prunable(): Builder
+    {
+        return self::query()->where('created_at', '<=', now()->subDays(30));
+    }
+}