InnoDb only allows 255 char key fields

include/upgrader/streams/core/9f3b454c-c0fd16f4.patch.sql

@@ -6,8 +6,8 @@
 
 -- Increment varchar size for various fields... based on feedback from users.
 
-ALTER TABLE  `%TABLE_PREFIX%session` 
-    CHANGE  `session_id`  `session_id` VARCHAR( 256 ) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT  '';
+ALTER TABLE  `%TABLE_PREFIX%session`
+    CHANGE `session_id` `session_id` VARCHAR(255) collate ascii_general_ci NOT NULL DEFAULT  '';
 
 ALTER TABLE  `%TABLE_PREFIX%ticket` 
     CHANGE  `name`  `name` VARCHAR( 255 ) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT  '',