diff --git a/misc/update_1.5_to_1.6.sql b/misc/update_1.5_to_1.6.sql
index dc2e736..74b93e9 100644
--- a/misc/update_1.5_to_1.6.sql
+++ b/misc/update_1.5_to_1.6.sql
@@ -26,3 +26,29 @@ ADD CONSTRAINT `FK_PORT`
   REFERENCES `bremen_calling_devel`.`port` (`id`)
   ON DELETE RESTRICT
   ON UPDATE RESTRICT;
+
+-- adding new ref column to shipcall incl. foreign key
+ALTER TABLE `bremen_calling_devel`.`shipcall` 
+ADD COLUMN `port_id` INT UNSIGNED NOT NULL DEFAULT 1 COMMENT 'Selected port for this shipcall' AFTER `evaluation_notifications_sent`,
+CHANGE COLUMN `time_ref_point` `time_ref_point` INT NULL DEFAULT '0' COMMENT 'Index of a location which is the reference point for all time value entries, e.g. berth or Geeste' AFTER `port_id`,
+ADD INDEX `FK_SHIPCALL_PORT_idx` (`port_id` ASC) VISIBLE;
+;
+ALTER TABLE `bremen_calling_devel`.`shipcall` 
+ADD CONSTRAINT `FK_SHIPCALL_PORT`
+  FOREIGN KEY (`port_id`)
+  REFERENCES `bremen_calling_devel`.`port` (`id`)
+  ON DELETE RESTRICT
+  ON UPDATE RESTRICT;
+
+CREATE TABLE `participant_port_map` (
+  `id` int NOT NULL AUTO_INCREMENT,
+  `participant_id` int unsigned NOT NULL COMMENT 'Ref to participant',
+  `port_id` int unsigned NOT NULL COMMENT 'Ref to port',
+  `created` datetime DEFAULT CURRENT_TIMESTAMP,
+  `modified` datetime DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  KEY `FK_PP_PARTICIPANT` (`participant_id`),
+  KEY `FK_PP_PORT` (`port_id`),
+  CONSTRAINT `FK_PP_PARTICIPANT` FOREIGN KEY (`participant_id`) REFERENCES `participant` (`id`),
+  CONSTRAINT `FK_PP_PORT` FOREIGN KEY (`port_id`) REFERENCES `port` (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='Mapping table that assigns participants to a port';