diff --git a/dba/davical.sql b/dba/davical.sql
index d5da518c..652ea002 100644
--- a/dba/davical.sql
+++ b/dba/davical.sql
@@ -114,6 +114,7 @@ CREATE TABLE caldav_data (
   logged_user INT references usr(user_no) ON UPDATE CASCADE ON DELETE SET DEFAULT DEFERRABLE,
   dav_id INT8 UNIQUE DEFAULT nextval('dav_id_seq'),
   collection_id INT8 REFERENCES collection(collection_id) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE,
+  weak_etag TEXT DEFAULT NULL,
 
   PRIMARY KEY ( user_no, dav_name )
 );
@@ -334,6 +335,7 @@ CREATE TABLE collection_mashup (
   dav_displayname TEXT
 );
 
+
 CREATE TABLE mashup_member (
   mashup_id INT8 NOT NULL REFERENCES collection_mashup(mashup_id) ON UPDATE CASCADE ON DELETE CASCADE,
   target_ticket_id TEXT REFERENCES access_ticket(ticket_id) ON UPDATE CASCADE ON DELETE CASCADE,
@@ -341,6 +343,7 @@ CREATE TABLE mashup_member (
   member_colour TEXT
 );
 
+
 CREATE TABLE addressbook_resource (
   dav_id INT8 NOT NULL REFERENCES caldav_data(dav_id) ON UPDATE CASCADE ON DELETE CASCADE PRIMARY KEY,
   version TEXT,
@@ -374,6 +377,7 @@ CREATE TABLE addressbook_address_email (
   property TEXT -- The full text of the property
 );
 
+
 CREATE TABLE calendar_alarm (
   dav_id INT8 NOT NULL REFERENCES caldav_data(dav_id) ON UPDATE CASCADE ON DELETE CASCADE,
   action TEXT,
diff --git a/dba/patches/1.2.8.sql b/dba/patches/1.2.8.sql
index b53b23c4..598b7ed6 100644
--- a/dba/patches/1.2.8.sql
+++ b/dba/patches/1.2.8.sql
@@ -7,6 +7,8 @@
 BEGIN;
 SELECT check_db_revision(1,2,7);
 
+ALTER TABLE caldav_data ADD COLUMN weak_etag TEXT DEFAULT NULL;
+
 CREATE TABLE access_ticket (
   ticket_id TEXT PRIMARY KEY,
   is_public BOOLEAN,
@@ -101,7 +103,6 @@ CREATE TABLE calendar_attendee (
   property TEXT -- The full text of the property
 );
 
-
 SELECT new_db_revision(1,2,8, 'Août' );
 
 COMMIT;