Adding log to discover error registering deleted accounts.

lib/DoctorKarma/DAO/User.pm

@@ -57,6 +57,7 @@ INSERT INTO users (id, first_name, username, karma) VALUES (?, ?, ?, 0);
 EOF
         my $username = "\@@{[$user->username]}:" // '';
         my $user_id  = $user->id_user;
+        $logger->log_info("Trying to register ${username}${user_id}.");
         my $success  = 0 +
           $db->do( $insert, {}, $user->id_user, $user->username, $user->karma );
         if ($success) {