How to clean up the mailboxes database?

[Gary Mills]

Something went wrong in deleting a mailbox and re-creating it on a
different partition.  The result is that the mailboxes database
contains mailbox entries for sub-folders of that mailbox on two
different partitions, even though the corresponding directories
don't exist.  Can I clean up this mess by dumping the database with
`ctl_mboxlist -d', deleting the erroneous lines and reloading it
with `ctl_mboxlist -u'?  The IMAP server would have to be down, of
course.  How safe is this?  There are about 16000 mailboxes.  We
are running cyrus-imapd-2.1.14.  The database is in skiplist format.

-- 
-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-