fix school year for all tables

app/Models/ExpenseModel.php

@@ -3,9 +3,12 @@
 namespace App\Models;
 
 use CodeIgniter\Model;
+use App\Models\Concerns\SchoolYearAutoFillTrait;
 
 class ExpenseModel extends Model
 {
+    use SchoolYearAutoFillTrait;
+
     protected $table = 'expenses';
     protected $primaryKey = 'id';
 
@@ -32,7 +35,8 @@ class ExpenseModel extends Model
     protected $updatedField = 'updated_at';
 
     protected $validationRules = [
-        // Add your validation rules here as needed
+        // Add your validation rules here as needed,
+        'school_year' => 'required|string|max_length[9]',
     ];
 
     public function getReimbursedExpensesWithDetails(array $filters = [])