diff --git a/admin/database_updates/2.4.9.php b/admin/database_updates/2.4.9.php
deleted file mode 100644
index 8d896664..00000000
--- a/admin/database_updates/2.4.9.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-/*
- * ITFlow - Database update to version 2.4.9 (from 2.4.8)
- * Included by admin/database_updates.php - do not access directly
- */
-
-defined('FROM_DB_UPDATER') || die("Direct file access is not allowed");
-
-    // Refunds are recorded as negative rows in payments so that every existing
-    // SUM(payment_amount) balance calculation picks them up for free. This column
-    // links a refund row back to the payment it reverses, which is what caps the
-    // refundable amount and lets the UI hide the button once a payment is fully
-    // refunded. NULL on every ordinary payment.
-    mysqli_query($mysqli, "ALTER TABLE `payments` ADD COLUMN `payment_refund_of_id` INT(11) DEFAULT NULL");
-    mysqli_query($mysqli, "ALTER TABLE `payments` ADD INDEX `payment_refund_of_id` (`payment_refund_of_id`)");
diff --git a/db.sql b/db.sql
index 2b95bd88..9530026b 100644
--- a/db.sql
+++ b/db.sql
@@ -1534,9 +1534,7 @@ CREATE TABLE `payments` (
   `payment_archived_at` datetime DEFAULT NULL,
   `payment_account_id` int(11) NOT NULL,
   `payment_invoice_id` int(11) NOT NULL DEFAULT 0,
-  `payment_refund_of_id` int(11) DEFAULT NULL,
-  PRIMARY KEY (`payment_id`),
-  KEY `payment_refund_of_id` (`payment_refund_of_id`)
+  PRIMARY KEY (`payment_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
@@ -2999,4 +2997,4 @@ CREATE TABLE `vendors` (
 /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
 
--- Dump completed on 2026-07-28 21:33:31
+-- Dump completed on 2026-07-28 22:07:36