diff --git a/db_structure.xml b/db_structure.xml
index cefb7fc52c..4c192ba028 100644
--- a/db_structure.xml
+++ b/db_structure.xml
@@ -308,7 +308,7 @@
 				<name>etag</name>
 				<type>text</type>
 				<default></default>
-				<notnull>true</notnull>
+				<notnull>false</notnull>
 				<length>40</length>
 			</field>
 
@@ -383,7 +383,7 @@
 				<name>user</name>
 				<type>text</type>
 				<default></default>
-				<notnull>true</notnull>
+				<notnull>false</notnull>
 				<length>64</length>
 			</field>