diff --git a/src/main/resources/db/migration/V20260407_1__add_index_notification_history_status_deadline.sql b/src/main/resources/db/migration/V20260407_1__add_index_notification_history_status_deadline.sql
new file mode 100644
index 0000000..0384714
--- /dev/null
+++ b/src/main/resources/db/migration/V20260407_1__add_index_notification_history_status_deadline.sql
@@ -0,0 +1,2 @@
+CREATE INDEX idx_nh_status_deadline
+    ON notification_history (status, deadline);