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Updating from 1.9 to 2.5 results in following from update.php
7004 - Change primary key to id field and add unique index on path and lang.
The following updates returned messages
Failed: DatabaseSchemaObjectExistsException: Cannot add unique key lang_path to table metatags_quick_path_based: unique key already exists. in DatabaseSchema_mysql->addUniqueKey() (line 417 of /home/sussexho/public_html/includes/database/mysql/schema.inc).