diff --git a/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/README.md b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/README.md
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+++ b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/README.md
@@ -0,0 +1,37 @@
+# 2021-03 Wikimedia CH's members wiki OAuth analysis
+
+This is a small script for [Wikimedia CH](https://wikimedia.ch/)'s members wiki OAuth analysis.
+
+https://members.wikimedia.ch/
+
+## Technical details
+
+https://phabricator.wikimedia.org/T278140
+
+## Installation
+
+```
+git clone --recurse-submodules https://gitpull.it/source/Wikimedia-Valerio-Bozzolan-bot-tasks/
+```
+
+## Usage
+
+```
+cd here
+
+./step-1-download-wmch-users.php
+./step-2-check-wmch-users.php
+./step-3-print-wikitable.php
+```
+
+Then do something with your `report.wiki`.
+
+## License
+
+Copyright (C) 2021 Valerio Bozzolan
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
diff --git a/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/load.php b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/load.php
new file mode 100644
index 0000000..0307b91
--- /dev/null
+++ b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/load.php
@@ -0,0 +1,6 @@
+<?php
+// require some stuff
+require __DIR__ . '/../includes/boz-mw/autoload-with-laser-cannon.php';
+
+// eventually create config wizard
+\cli\ConfigWizard::requireOrCreate( __DIR__ . '/../config.php' );
diff --git a/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-1-download-wmch-users.php b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-1-download-wmch-users.php
new file mode 100755
index 0000000..d305d0a
--- /dev/null
+++ b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-1-download-wmch-users.php
@@ -0,0 +1,34 @@
+#!/usr/bin/php
+<?php
+
+require 'load.php';
+
+// Wikimedia CH
+$wmch = wmch();
+
+// fix read permission
+$wmch->login();
+
+$wmch_users_queries = $wmch->createQuery( [
+	'action'  => 'query',
+	'list'    => 'allusers',
+	'aulimit' => 500,
+] );
+
+$users = [];
+
+foreach( $wmch_users_queries as $wmch_user_query_batches ) {
+
+	foreach( $wmch_user_query_batches as $wmch_user_query_batch ) {
+
+		$allusers = $wmch_user_query_batch->allusers ?? [];
+		foreach( $allusers as $user ) {
+
+			$users[] = $user;
+
+		}
+	}
+
+}
+
+file_put_data( 'wmch-users.data', $users );
diff --git a/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-2-check-wmch-users.php b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-2-check-wmch-users.php
new file mode 100755
index 0000000..ff0c658
--- /dev/null
+++ b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-2-check-wmch-users.php
@@ -0,0 +1,56 @@
+#!/usr/bin/php
+<?php
+
+$BATCH = 50;
+
+require 'load.php';
+
+$users = file_get_data( 'wmch-users.data' );
+
+$all_users = $users;
+
+/**
+ * Callback fired for each match
+ */
+$matched_callback = function( $response_user, $my_user ) {
+
+	// registration date if provided
+	if( isset( $response_user->registration ) ) {
+		$my_user->registration = $response_user->registration;
+	}
+
+	// inherit Meta user ID if provided
+	if( isset( $response_user->userid ) ) {
+		$my_user->metauserid = $response_user->userid;
+	}
+};
+
+$get_name = function ( $a ) {
+	return $a->name;
+};
+
+do {
+
+	// process some each time
+	$batch = [];
+	for( $i = 0; $i < $BATCH && $users; $i++ ) {
+		$batch[] = array_pop( $users )->name;
+	}
+
+	$queries = meta()->createQuery( [
+		'action'  => 'query',
+		'list'    => 'users',
+		'ususers' => $batch,
+		'usprop'  => 'registration',
+	] );
+	foreach( $queries as $query ) {
+
+		// match results
+		response_matcher( $query, $all_users, 'query', 'users' )
+			->matchByCustomJoin( $matched_callback, $get_name );
+	}
+
+} while( $users );
+
+// save the merged data
+file_put_data( 'wmch-users-checked.data', $all_users );
diff --git a/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-3-print-wikitable.php b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-3-print-wikitable.php
new file mode 100755
index 0000000..2503864
--- /dev/null
+++ b/2021-03-Wikimedia-CH-members-wiki-OAuth-analysis/step-3-print-wikitable.php
@@ -0,0 +1,54 @@
+#!/usr/bin/php
+<?php
+
+require 'load.php';
+
+$users = file_get_data( 'wmch-users-checked.data' );
+
+usort( $users, function( $a, $b ) {
+
+	if( $a->name === $b->name ) {
+		return 0;
+	}
+
+	return $a->name < $b->name ? -1 : 1;
+} );
+
+$print_table = function( $users, $condition = null ) {
+
+	echo "{| class=\"wikitable\"\n";
+	echo "! Line\n";
+	echo "! Username WMCH\n";
+	echo "! Link Meta (assumed)\n";
+	echo "! Meta\n";
+
+	$i = 1;
+	foreach( $users as $user ) {
+
+		$user->metauserid = $user->metauserid ?? '';
+
+		if( !$condition || $condition( $user ) ) {
+
+			echo    "|-\n";
+			echo    "| $i\n";
+			printf( "| [[User:%s]]\n",   $user->name );
+			printf( "| [[metawikipedia:User:%s]]\n", $user->name );
+			echo    "| {$user->metauserid}\n";
+
+			$i++;
+		}
+	}
+
+	echo "|}\n";
+};
+
+echo "== Matching users ==\n";
+$print_table( $users, function( $user ) {
+	return !empty( $user->metauserid );
+} );
+echo "\n";
+
+echo "== Missing users ==\n";
+$print_table( $users, function( $user ) {
+	return empty( $user->metauserid );
+} );
diff --git a/includes/boz-mw b/includes/boz-mw
index bbe6f1d..51936f6 160000
--- a/includes/boz-mw
+++ b/includes/boz-mw
@@ -1 +1 @@
-Subproject commit bbe6f1d36e9bc172ff6d83db4d1c6436c50950cb
+Subproject commit 51936f610239938ac7f63f097752784097f09417