diff --git a/scripts/shift-created-at-from-17.sql b/scripts/shift-created-at-from-17.sql
new file mode 100644
index 0000000..7a1c712
--- /dev/null
+++ b/scripts/shift-created-at-from-17.sql
@@ -0,0 +1,21 @@
+-- One-shot: devices.created_at on/after Sep 17 still +8h (missed by 14:00 cutoff).
+-- Do not re-run the previous shift-old-datetimes script.
+
+SET time_zone = '+08:00';
+SET @from = '2026-09-17 00:00:00';
+
+SELECT COUNT(*) AS n, MIN(created_at) AS mn, MAX(created_at) AS mx
+  FROM devices
+ WHERE created_at IS NOT NULL AND created_at >= @from;
+
+UPDATE devices
+   SET created_at = DATE_SUB(created_at, INTERVAL 8 HOUR)
+ WHERE created_at IS NOT NULL AND created_at >= @from;
+
+SELECT ROW_COUNT() AS created_at_updated;
+
+SELECT id, device_id, created_at, updated_at
+  FROM devices
+ WHERE created_at IS NOT NULL
+ ORDER BY created_at DESC
+ LIMIT 5;