1 files changed, 9 insertions, 0 deletions
diff --git a/Bugzilla/Migrate/Flyspray.pm b/Bugzilla/Migrate/Flyspray.pm
index 406bb8f66..c38c21a35 100644
--- a/Bugzilla/Migrate/Flyspray.pm
+++ b/Bugzilla/Migrate/Flyspray.pm
@@ -529,6 +529,7 @@ sub _get_username {
   my ($self, $userid) = @_;
   my $email = $self->{map_user_id_to_email}->{$userid // -1}
     // $self->{map_user_id_to_email}->{-1};
+  $self->{email_to_keep}->{$email} = 1;
   return $email;
 }
 
@@ -543,6 +544,14 @@ sub translate_bug {
   return wantarray ? ($bug, $other_fields) : $bug;
 }
 
+sub after_read {
+  my ($self) = @_;
+
+  # only migrate users that have comments/attachments/are used somewhere
+  $self->{users} = [grep { defined $self->{email_to_keep}->{$_->{login_name}} }
+      @{$self->{users}}];
+}
+
 sub after_insert {
   my ($self) = @_;