get failed auth

[My Work]

Hi, how i can write all users to my db (mysql example) if it is possible 
that get "unknown user", "auth failed" e.g.?

dovecot 2.2.13

root at dev0:/home/fov# dovecot -n
# 2.2.13: /etc/dovecot/dovecot.conf
# OS: Linux 3.16.0-4-amd64 x86_64 Debian 8.0 ext4
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_socket_path = /var/run/dovecot/auth-master
base_dir = /var/run/dovecot/
disable_plaintext_auth = no
first_valid_gid = 103
first_valid_uid = 101
listen = *
mail_access_groups = mail,Debian-exim,dovecot
mail_debug = yes
mail_full_filesystem_access = yes
mail_gid = 103
mail_location = maildir:/var/vmail/%d/%n
mail_uid = 101
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date
namespace inbox {
   inbox = yes
   location =
   prefix =
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
}
plugin {
   autocreate = Trash
   autocreate2 = Sent
   autocreate3 = Drafts
   autocreate4 = Junk
   autosubscribe = Trash
   autosubscribe2 = Sent
   autosubscribe3 = Drafts
   autosubscribe4 = Junk
   sieve = /var/vmail/%d/%n/currently-active-script.sieve
   sieve_dir = /var/vmail/%d/%n/sieve
}
protocols = imap sieve
service auth {
   unix_listener auth-client {
     group = Debian-exim
     mode = 0666
     user = Debian-exim
   }
   unix_listener auth-master {
     group = Debian-exim
     mode = 0666
     user = Debian-exim
   }
   user = root
}
service imap-login {
   inet_listener imap {
     port = 143
   }
}
service managesieve-login {
   executable = /usr/lib/dovecot/managesieve-login
   inet_listener sieve {
     port = 2074
   }
   process_min_avail = 1
   service_count = 1
   vsz_limit = 64 M
}
service managesieve {
   executable = /usr/lib/dovecot/managesieve
   process_limit = 10
}
ssl = no
userdb {
   args = /etc/dovecot/dovecot-sql.conf
   driver = sql
}
protocol lda {
   auth_socket_path = /var/run/dovecot/auth-master
   info_log_path = /tmp/dovecot-deliver.log
   log_path = /tmp/dovecot-deliver.log
   mail_plugins = sieve
   postmaster_address = postmaster at horsetele.com.ua
   sendmail_path = /usr/sbin/exim4
}
protocol imap {
   imap_client_workarounds = tb-extra-mailbox-sep
   mail_plugins = autocreate
}
protocol sieve {
   managesieve_implementation_string = dovecot
   managesieve_max_line_length = 65536
}