diff --git a/bin/backpan.pl b/bin/backpan.pl
new file mode 100644
index 0000000..bc18e44
--- /dev/null
+++ b/bin/backpan.pl
@@ -0,0 +1,168 @@
+use strict;
+use warnings;
+use v5.36;
+
+use Getopt::Long;
+use MetaCPAN::Logger qw< :log :dlog >;
+
+use MetaCPAN::ES;
+use MetaCPAN::Ingest qw< cpan_file_map >;
+
+# args
+my ( $distribution, $files_only, $undo );
+GetOptions(
+    "distribution=s" => \$distribution,
+    "files_only"     => \$files_only,
+    "undo"           => \$undo,
+);
+
+# setup
+my $cpan_file_map = cpan_file_map();
+my $es_release    = MetaCPAN::ES->new( type => "release" );
+my $es_file       = MetaCPAN::ES->new( type => "file" );
+
+my %bulk;
+my %release_status;
+
+build_release_status_map();
+update_releases() unless $files_only;
+update_files();
+
+$_->flush for values %bulk;
+
+log_info {"done"};
+
+###
+
+sub build_release_status_map () {
+    log_info {"find_releases"};
+
+    my $scroll = $es_release->scroll(
+        fields => [qw< author archive name >],
+        body   => get_release_query(),
+    );
+
+    while ( my $release = $scroll->next ) {
+        my $author  = $release->{fields}{author}[0];
+        my $archive = $release->{fields}{archive}[0];
+        my $name    = $release->{fields}{name}[0];
+        next unless $name;    # bypass some broken releases
+
+        $release_status{$author}{$name} = [
+            (
+                $undo
+                    or exists $cpan_file_map->{$author}{$archive}
+            )
+            ? 'cpan'
+            : 'backpan',
+            $release->{_id}
+        ];
+    }
+}
+
+sub get_release_query () {
+    unless ($undo) {
+        return +{
+            query => {
+                not => { term => { status => 'backpan' } }
+            }
+        };
+    }
+
+    return +{
+        query => {
+            bool => {
+                must => [
+                    { term => { status => 'backpan' } },
+                    (
+                        $distribution
+                        ? { term => { distribution => $distribution } }
+                        : ()
+                    )
+                ]
+            }
+        }
+    };
+}
+
+sub update_releases () {
+    log_info {"update_releases"};
+
+    $bulk{release} ||= $es_release->bulk( timeout => '5m' );
+
+    for my $author ( keys %release_status ) {
+
+        # value = [ status, _id ]
+        for ( values %{ $release_status{$author} } ) {
+            $bulk{release}->update( {
+                id  => $_->[1],
+                doc => {
+                    status => $_->[0],
+                }
+            } );
+        }
+    }
+}
+
+sub update_files () {
+    for my $author ( keys %release_status ) {
+        my @releases = keys %{ $release_status{$author} };
+        while ( my @chunk = splice @releases, 0, 1000 ) {
+            update_files_author( $author, \@chunk );
+        }
+    }
+}
+
+sub update_files_author ( $author, $author_releases ) {
+    log_info { "update_files: " . $author };
+
+    my $scroll_file = $es_file->scroll(
+        scroll => '5m',
+        fields => [qw< release >],
+        body   => {
+            query => {
+                bool => {
+                    must => [
+                        { term  => { author  => $author } },
+                        { terms => { release => $author_releases } }
+                    ]
+                }
+            }
+        },
+    );
+
+    $bulk{file} ||= $es_file->bulk( timeout => '5m' );
+
+    while ( my $file = $scroll_file->next ) {
+        my $release = $file->{fields}{release}[0];
+        $bulk{file}->update( {
+            id  => $file->{_id},
+            doc => {
+                status => $release_status{$author}{$release}[0]
+            }
+        } );
+    }
+}
+
+1;
+
+=pod
+
+=head1 SYNOPSIS
+
+ $ bin/backpan
+
+ $ bin/backpan --distribution DIST
+
+ $ bin/backpan --files_only
+
+ $ bin/backpan --undo ...
+
+=head1 DESCRIPTION
+
+Sets "backpan" status on all BackPAN releases.
+
+--undo will set distributions' status back as 'cpan'
+--file_only will only fix the 'file' type
+
+=cut