Adding sequence to graph_tree table.

cacti.sql

@@ -1736,7 +1736,8 @@ CREATE TABLE graph_tree (
   user_id int(10) unsigned DEFAULT '1',
   last_modified timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
   modified_by int(10) unsigned DEFAULT '1',
-  PRIMARY KEY (id)
+  PRIMARY KEY (id),
+  KEY sequence(sequence)
 ) ENGINE=InnoDB;
 
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