diff --git a/db_scripts/diff/15690.down b/db_scripts/diff/15690.down
new file mode 100644
index 00000000..4fda54e5
--- /dev/null
+++ b/db_scripts/diff/15690.down
@@ -0,0 +1,4 @@
+use kamailio;
+ALTER TABLE kamailio.sems_registrations
+  DROP FOREIGN KEY `sub_id_ref`,
+  DROP FOREIGN KEY `lcr_gw_ref`;
diff --git a/db_scripts/diff/15690.up b/db_scripts/diff/15690.up
new file mode 100644
index 00000000..082ef5da
--- /dev/null
+++ b/db_scripts/diff/15690.up
@@ -0,0 +1,9 @@
+use kamailio;
+
+SET autocommit=0;
+DELETE FROM `sems_registrations` WHERE `sems_registrations`.`subscriber_id` NOT IN (SELECT `id` FROM `subscriber`);
+COMMIT;
+
+ALTER TABLE `sems_registrations`
+  ADD CONSTRAINT `sub_id_ref` FOREIGN KEY (`subscriber_id`) REFERENCES `subscriber` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
+  ADD CONSTRAINT `lcr_gw_ref` FOREIGN KEY (`peer_host_id`) REFERENCES `lcr_gw` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;