Where Dovecot stores subscribtions for shared folder

[Miloslav Hůla]

Hi,

could please someone hint me, where Dovecot stores subscribtions for 
shared folder?

Our configuration:

namespace {
   disabled = no
   hidden = no
   ignore_on_failure = no
   inbox = no
   list = children
   location = 
maildir:/vmail/user/%%n/Maildir:INDEXPVT=/vmail/user/%n/Maildir/Shared/%%n
   prefix = user.%%n.
   separator = .
   subscriptions = yes
   type = shared
}

When I subscribe to 'user.test', I'll get 
~Maildir/Shared/test/.INBOX/dovecot.index.pvt.log in it.

When I unsubscribe from 'user.test', file stays there and its hash is 
the same.

Kind regards, Milo