remove codeigniter

app/Models/Invoice.php

@@ -11,7 +11,7 @@ class Invoice extends BaseModel
     protected $table = 'invoices';
 
     /**
-     * CI: useTimestamps = false because DB defaults/triggers manage created_at/updated_at.
+     * legacy: useTimestamps = false because DB defaults/triggers manage created_at/updated_at.
      * In Laravel, keep timestamps OFF and let DB handle them.
      */
     public $timestamps = false;
@@ -67,7 +67,7 @@ class Invoice extends BaseModel
     }
 
     /* =========================
-     * CI beforeInsert/beforeUpdate equivalents (normalize to UTC)
+     * legacy beforeInsert/beforeUpdate equivalents (normalize to UTC)
      * ========================= */
 
     protected static function booted(): void
@@ -135,7 +135,7 @@ class Invoice extends BaseModel
     }
 
     /* =========================
-     * Queries (ported from CI)
+     * Queries (ported from legacy)
      * ========================= */
 
     public static function getInvoicesByUserId(int $userId, ?string $schoolYear = null): array