remove codeigniter

app/Models/DiscountVoucher.php

@@ -10,7 +10,7 @@ class DiscountVoucher extends BaseModel
 {
     protected $table = 'discount_vouchers';
 
-    // ✅ CI manages created_at / updated_at
+    // ✅ legacy manages created_at / updated_at
     public $timestamps = true;
 
     protected $fillable = [
@@ -39,7 +39,7 @@ class DiscountVoucher extends BaseModel
     ];
 
     /* =========================
-     * Model hooks (CI beforeInsert/beforeUpdate equivalents)
+     * Model hooks (legacy beforeInsert/beforeUpdate equivalents)
      * ========================= */
 
     protected static function booted(): void
@@ -95,7 +95,7 @@ class DiscountVoucher extends BaseModel
             $until = Carbon::parse($this->valid_until)->toDateString();
             if ($from > $until) {
                 // In Laravel, prefer validating in FormRequest.
-                // This keeps your CI behavior by failing the save.
+                // This keeps your legacy behavior by failing the save.
                 throw new \InvalidArgumentException('Valid Until must be the same as or after Valid From.');
             }
         }
@@ -108,7 +108,7 @@ class DiscountVoucher extends BaseModel
     /**
      * Find a valid voucher for a student (not expired, active, under max uses, and not used by the student).
      *
-     * NOTE: Your CI joins discount_usages on u.student_id. That requires discount_usages.student_id to exist.
+     * NOTE: Your legacy joins discount_usages on u.student_id. That requires discount_usages.student_id to exist.
      * If your discount_usages table does NOT have student_id (some of your other code uses parent_id),
      * switch the filter to parent_id instead.
      */