diff --git a/db_schema.sql b/db_schema.sql
index 06b5c08554e4d74c227ae97626e415e7baecb0dc..dca92485183b6e56b7f863598722887252853d79 100644
--- a/db_schema.sql
+++ b/db_schema.sql
@@ -24,7 +24,7 @@ CREATE TABLE IF NOT EXISTS `changelog` (
   `id_key` varchar(64) NOT NULL,
   `id_value` text NOT NULL,
   `field` varchar(255) NOT NULL,
-  `value_old` text NOT NULL,
+  `value_old` text,
   `value_new` text NOT NULL,
   `executed` text NOT NULL
 );