update fix deadcode, security

app/Models/ActivityLog.php

@@ -38,13 +38,4 @@ class ActivityLog extends Model
             $model->created_at = now();
         });
     }
-
-    public function causer()
-    {
-        return match ($this->causer_type) {
-            'admin'    => $this->belongsTo(User::class, 'causer_id'),
-            'customer' => $this->belongsTo(Customer::class, 'causer_id'),
-            default    => null,
-        };
-    }
 }