fix school year for all tables

app/Models/InvoiceStudentListModel.php

@@ -3,9 +3,12 @@
 namespace App\Models;
 
 use CodeIgniter\Model;
+use App\Models\Concerns\SchoolYearAutoFillTrait;
 
 class InvoiceStudentListModel extends Model
 {
+    use SchoolYearAutoFillTrait;
+
     // Specify the table name
     protected $table = 'invoice_students_list';
 
@@ -21,8 +24,13 @@ class InvoiceStudentListModel extends Model
         'school_id',
         'enrolled',
         'created_at',
-        'updated_at'
+        'updated_at',
+        'school_year',
     ];
+    protected $validationRules = [
+        'school_year' => 'required|string|max_length[9]',
+    ];
+
 
     // Enable auto-incrementing primary key
     protected $useAutoIncrement = true;