fix school year for all tables

app/Models/StaffModel.php

@@ -3,9 +3,12 @@
 namespace App\Models;
 
 use CodeIgniter\Model;
+use App\Models\Concerns\SchoolYearAutoFillTrait;
 
 class StaffModel extends Model
 {
+    use SchoolYearAutoFillTrait;
+
     protected $table            = 'staff';
     protected $primaryKey       = 'id';
     protected $useAutoIncrement = true;
@@ -22,8 +25,13 @@ class StaffModel extends Model
         'role_name',
         'active_role',
         'created_at',
-        'updated_at'
+        'updated_at',
+        'school_year',
     ];
+    protected $validationRules = [
+        'school_year' => 'required|string|max_length[9]',
+    ];
+
 
     protected $useTimestamps = false; // Managed manually in controller
 
@@ -51,7 +59,7 @@ class StaffModel extends Model
             return false;
         }
 
-        unset($data['school_year'], $data['status']);
+        unset($data['status']);
 
         $existing = $this->where('user_id', $data['user_id'])->first();