diff --git a/db/db.update.4.sql b/db/db.update.4.sql
index 4f39f8d..280ddf7 100644
--- a/db/db.update.4.sql
+++ b/db/db.update.4.sql
@@ -7,3 +7,21 @@ CREATE TABLE `judges_timeslots` (
 	`year` INT NOT NULL ,
 	PRIMARY KEY ( `id` ) 
 );
+CREATE TABLE `judges_teams_timeslots_link` (
+	`id` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
+	`judges_teams_id` INT UNSIGNED NOT NULL ,
+	`judges_timeslots_id` INT UNSIGNED NOT NULL ,
+	`year` INT UNSIGNED NOT NULL ,
+	PRIMARY KEY ( `id` ) 
+);
+ALTER TABLE judges_teams_timeslots_link ADD UNIQUE (judges_teams_id,judges_timeslots_id,year);
+CREATE TABLE `judges_teams_timeslots_projects_link` (
+	`id` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
+	`judges_teams_id` INT UNSIGNED NOT NULL ,
+	`judges_timeslots_id` INT UNSIGNED NOT NULL ,
+	`projects_id` INT UNSIGNED NOT NULL ,
+	`year` INT UNSIGNED NOT NULL ,
+	PRIMARY KEY ( `id` ) 
+);
+ALTER TABLE `judges_teams_timeslots_projects_link` ADD UNIQUE (judges_teams_id,judges_timeslots_id,projects_id,year);
+ALTER TABLE `projects` CHANGE `projectnumber` `projectnumber` VARCHAR( 16 ) DEFAULT NULL;