diff --git a/include/upgrader/streams/core.sig b/include/upgrader/streams/core.sig
index 0db3e30eb6ae95b9673f62de2041b1ff9cec8e6c..68f58c5ebd07db09e5e22e9d52f6f4a4c63a1c17 100644
--- a/include/upgrader/streams/core.sig
+++ b/include/upgrader/streams/core.sig
@@ -1 +1 @@
-d9e311ad50bfe981f4356500c1d584ce
+9143a511719555e8f8f09b49523bd022
diff --git a/include/upgrader/streams/core/2d590ffa-d9e311ad.patch.sql b/include/upgrader/streams/core/2d590ffa-9143a511.patch.sql
similarity index 94%
rename from include/upgrader/streams/core/2d590ffa-d9e311ad.patch.sql
rename to include/upgrader/streams/core/2d590ffa-9143a511.patch.sql
index 4bf8eb68df8b75e0a17d87b39ae0760c8cf94461..f52e0bb25639e765aa47b617c3726e689dce1c2c 100644
--- a/include/upgrader/streams/core/2d590ffa-d9e311ad.patch.sql
+++ b/include/upgrader/streams/core/2d590ffa-9143a511.patch.sql
@@ -1,5 +1,5 @@
 /*
- * @signature d9e311ad50bfe981f4356500c1d584ce
+ * @signature 9143a511719555e8f8f09b49523bd022
  * @version v1.9.6
  * @title All collaborators have threads
  *
@@ -47,5 +47,5 @@ DROP TABLE `%TABLE_PREFIX%_orig_msg_ids`;
 
 -- Finished with patch
 UPDATE `%TABLE_PREFIX%config`
-    SET `value` = 'd9e311ad50bfe981f4356500c1d584ce'
+    SET `value` = '9143a511719555e8f8f09b49523bd022'
     WHERE `key` = 'schema_signature' AND `namespace` = 'core';
diff --git a/setup/inc/streams/core/install-mysql.sql b/setup/inc/streams/core/install-mysql.sql
index ca83ca1230f5d082adb988908ff378a333fb5cba..26f129681118b2c67eea32dc5f4b74f78d30a656 100644
--- a/setup/inc/streams/core/install-mysql.sql
+++ b/setup/inc/streams/core/install-mysql.sql
@@ -709,7 +709,6 @@ CREATE TABLE `%TABLE_PREFIX%lock` (
   `code` varchar(20),
   `created` datetime NOT NULL,
   PRIMARY KEY  (`lock_id`),
-  UNIQUE KEY `ticket_id` (`ticket_id`),
   KEY `staff_id` (`staff_id`)
 ) DEFAULT CHARSET=utf8;