diff --git a/app/Models/Activity.php b/app/Models/Activity.php
index 805e4a8..ed20699 100644
--- a/app/Models/Activity.php
+++ b/app/Models/Activity.php
@@ -2,8 +2,37 @@
 
 namespace App\Models;
 
-use App\Models\Model;
+use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
 class Activity extends Model
 {
+    use HasFactory;
+
+    protected $fillable = [
+        'business_id', 'project_id', 'system_id', 'workflow_id', 'status_id', 'sprint_id',
+        'actor_id', 'task_id', 'subject_id', 'user_id', 'crud_id', 'table_id', 'original', 'diff'
+    ];
+
+    public $casts = [
+        'original' => 'array',
+        'diff' => 'array',
+    ];
+
+    public function scopeCreatesBefore($query, $date)
+    {
+        return $query->whereDate('created_at', '<=', Carbon::parse($date));
+    }
+    public function scopeCreatesAfter($query, $date)
+    {
+        return $query->whereDate('created_at', '>=', Carbon::parse($date));
+    }
+    public function scopeCreatesIn($query, $days)
+    {
+        return $days != "" ?
+            $query->whereDate('created_at', '>=', Carbon::now()->modify('-'.$days.' day')->toDate()) :
+            $query;
+    }
 
 }