[Dovecot] Trouble with expire plugin

[Gedalya]

Hi all,

Maybe someone here can help me with this problem, not sure if this is a 
configuration issue or an actual bug.

my daily cron job says:

#!/bin/sh
doveadm expunge -A mailbox Junk savedbefore 14d
doveadm expunge -A mailbox Trash savedbefore 30d
doveadm expunge -A mailbox "Trash.*" savedbefore 30d

But it hasn't been deleting any messages in a long time, I'm not sure 
when it stopped working.

I've also noticed that it does delete matching rows in the expires 
database (expire_stamp < savedbefore days).
Furthermore, rows are deleted even when running doveadm search, and 
regardless of the mailbox column, i.e. even when != the mailbox name 
being searched!
Anyway why should doveadm search delete rows in the expires database?

The database is mysql.

----   dovecot -n  ----
# 2.1.7: /etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-0.bpo.3-amd64 x86_64 Debian 6.0.6
auth_default_realm = xxxxxxx.com
auth_mechanisms = plain login cram-md5
auth_verbose = yes
auth_verbose_passwords = plain
default_client_limit = 8096
dict {
   expire = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
   quota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
mail_gid = vmail
mail_plugins = quota expire listescape
mail_uid = vmail
managesieve_sieve_capability = fileinto envelope encoded-character 
subaddress comparator-i;ascii-numeric relational regex imap4flags copy 
include variables mailbox date ihave
namespace {
   inbox = yes
   location =
   prefix =
   separator = /
   type = private
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   antispam_backend = pipe
   antispam_pipe_program = /usr/bin/ssh
   antispam_pipe_program_args = 
-l;spamd;-i;/etc/dovecot/sareport.key;mx1.xxxxxxx.com
   antispam_pipe_program_notspam_arg = revoke
   antispam_pipe_program_spam_arg = report
   antispam_pipe_tmpdir = /tmp
   antispam_spam = Junk
   antispam_trash_pattern_ignorecase = trash;Deleted *
   autocreate = Trash
   autocreate2 = Junk
   autocreate3 = Drafts
   autocreate4 = Sent
   autosubscribe = Trash
   autosubscribe2 = Junk
   autosubscribe3 = Drafts
   autosubscribe4 = Sent
   expire = Trash
   expire2 = Trash.*
   expire3 = Junk
   expire_dict = proxy::expire
   quota = dict:user::proxy::quota
   quota_rule = *:storage=2G
   quota_rule2 = Trash:storage=+250M
   quota_rule3 = Junk:ignore
   quota_warning = storage=99%% quota-warning 99 %u
   quota_warning2 = storage=95%% quota-warning 95 %u
   sieve = ~/.dovecot.sieve
   sieve_before = /var/local/lib/dovecot/sieve/global/fileinto-spam.sieve
   sieve_dir = ~/sieve
   sieve_extensions = -vacation -body -reject -enotify -environment 
-virustest -spamtest
   sieve_max_actions = 32
   sieve_max_redirects = 4
   sieve_max_script_size = 10K
   sieve_quota_max_scripts = 10
}
postmaster_address = postmaster at xxxxxxx.com
protocols = imap pop3 lmtp sieve
service auth-worker {
   user = $default_internal_user
}
service auth {
   client_limit = 20480
   unix_listener auth-userdb {
     group = root
     mode = 0600
     user = vmail
   }
}
service dict {
   unix_listener dict {
     mode = 0600
     user = vmail
   }
}
service imap-login {
   process_min_avail = 4
   service_count = 0
   vsz_limit = 128 M
}
service imap {
   process_limit = 10240
}
service lmtp {
   inet_listener lmtp {
     address = 0.0.0.0
     port = 7025
   }
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
   service_count = 0
   vsz_limit = 128 M
}
service pop3-login {
   process_min_avail = 4
   service_count = 0
   vsz_limit = 128 M
}
service pop3 {
   process_limit = 4096
}
service quota-warning {
   executable = script /usr/local/bin/quota-warning
   unix_listener quota-warning {
     user = vmail
   }
   user = vmail
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
   driver = prefetch
}
userdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
verbose_proctitle = yes
protocol lmtp {
   mail_plugins = quota expire listescape sieve
}
protocol lda {
   mail_plugins = quota expire listescape sieve
}
protocol imap {
   mail_max_userip_connections = 25
   mail_plugins = quota expire listescape autocreate imap_quota antispam
   ssl_cert = </etc/dovecot/imap.xxxxxxx.com.crt
   ssl_key = </etc/dovecot/imap.xxxxxxx.com.key
}
protocol sieve {
   mail_max_userip_connections = 10
}
protocol pop3 {
   mail_max_userip_connections = 10
   mail_plugins = quota expire listescape
   pop3_fast_size_lookups = yes
   pop3_lock_session = no
   pop3_no_flag_updates = yes
   pop3_reuse_xuidl = yes
   pop3_save_uidl = no
   pop3_uidl_format = %08Xu%08Xv
   ssl_cert = </etc/dovecot/pop.xxxxxxx.com.crt
   ssl_key = </etc/dovecot/pop.xxxxxxx.com.key
}


in dovecot-sql.conf.ext I have:
iterate_query = SELECT userid as user, domain FROM email where deleted=0


---- dovecot-dict-sql.conf.ext ----
connect = host=localhost dbname=email user=email
map {
   pattern = priv/quota/storage
   table = quota
   username_field = username
   value_field = bytes
}
map {
   pattern = priv/quota/messages
   table = quota
   username_field = username
   value_field = messages
}
map {
   pattern = shared/expire/$user/$mailbox
   table = expires
   value_field = expire_stamp
   fields {
     username = $user
     mailbox = $mailbox
   }
}