fix school year for all tables

app/Models/InvoiceModel.php

@@ -3,9 +3,12 @@
 namespace App\Models;
 
 use CodeIgniter\Model;
+use App\Models\Concerns\SchoolYearAutoFillTrait;
 
 class InvoiceModel extends Model
 {
+    use SchoolYearAutoFillTrait;
+
     protected $table      = 'invoices';
     protected $primaryKey = 'id';
     protected $returnType = 'array';
@@ -40,6 +43,7 @@ class InvoiceModel extends Model
     'issue_date'     => 'required|valid_date[Y-m-d H:i:s]',
     'due_date'       => 'permit_empty|valid_date[Y-m-d H:i:s]',
     'status'           => 'required|string|max_length[50]',
+    'school_year' => 'required|string|max_length[9]',
 ];