diff --git a/sql-schema/081.sql b/sql-schema/081.sql
new file mode 100644
index 0000000000..4a4353d433
--- /dev/null
+++ b/sql-schema/081.sql
@@ -0,0 +1 @@
+ALTER TABLE  `sensors` ADD  `lastupdate` TIMESTAMP ON UPDATE CURRENT_TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP;