It looks like index 'messages' is now redundant. See privatemsg.install, function privatemsg_schema().

     'primary key'     => array('mid', 'recipient', 'type'),
     'indexes'         => array(
       'list'          => array('recipient', 'type', 'deleted', 'is_new'),
-      'messages'      => array('mid', 'recipient', 'type'),
       'participants'  => array('thread_id', 'recipient', 'type', 'deleted'),
     ),

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oadaeh’s picture

oadaeh CreditAttribution: oadaeh as a volunteer commented
Issue summary: View changes
Status: Active » Closed (won't fix)

This issue is being closed because it is against a branch for a version of Drupal that is no longer supported.
If you feel that this issue is still valid, feel free to re-open and update it (and any possible patch) to work with the 7.x-1.x branch (bug fixes only) or the 7.x-2.x branch.
Thank you.