diff --git a/sql/manual_changes/2026-06-11-alter-mcu-preregister-dob-to-varchar.sql b/sql/manual_changes/2026-06-11-alter-mcu-preregister-dob-to-varchar.sql
new file mode 100644
index 00000000..fd7c4ec3
--- /dev/null
+++ b/sql/manual_changes/2026-06-11-alter-mcu-preregister-dob-to-varchar.sql
@@ -0,0 +1,4 @@
+-- Ganti tipe Mcu_PreregisterPatientsDOB dari DATE ke VARCHAR
+-- agar nilai masked (**-**-YYYY) bisa tersimpan sebagai string
+ALTER TABLE one_lab.mcu_preregister_patients
+  MODIFY COLUMN Mcu_PreregisterPatientsDOB VARCHAR(20) NULL DEFAULT NULL;