- remove useless columnt

db/schema/domain.xml

@@ -58,16 +58,6 @@
 	</description>
     </column>
 
-    <column>
-	<name>last_modified</name>
-	<type>datetime</type>
-	<my:type>timestamp</my:type>
-	<default>1970-01-01 00:00:00</default>
-	<description>
-	    Date and time of the last modification of the domain.
-	</description>
-    </column>
-    
     <column>
 	<name>flags</name>
 	<type>unsigned int</type>