[Dovecot] Fixed mailbox id?

Hello,

I have many Sieve rules and searching for a way to "track" renamings/moving of mailboxes (folders) on my IMAP server. Is there a unique ID for every folder available? I don't think there, i found no ID inside my folders :(

If not, it think i need to create a ID-file for every folder and after that i can track the folders and update the rules =)

Thanks