#2102 Labels: correct key lenght

install/sql/system.sql

@@ -4463,7 +4463,7 @@ CREATE TABLE `sys_labels` (
   `order` int(11) NOT NULL DEFAULT 0,
   `value` varchar(128) NOT NULL,
   PRIMARY KEY (id),
-  UNIQUE KEY `value` (`value`)
+  UNIQUE KEY `value` (`value`(191))
 );
 
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