Viewing File: /usr/local/cpanel/base/3rdparty/roundcube/plugins/carddav/dbmigrations/0008-unifyindexes/mysql.sql

-- Drop the UNIQUE constraint on (user_id,presetname) in addressbooks table
ALTER TABLE TABLE_PREFIXcarddav_addressbooks DROP INDEX `user_id`, ADD INDEX `user_id` (`user_id`) USING BTREE;