From 58d81162bf7fdf9302a8165ceacbe989163e1bed Mon Sep 17 00:00:00 2001
From: dena <dena@wikimedia.de>
Date: Fri, 23 Jan 2026 15:23:43 +0100
Subject: [PATCH] add comments

---
 app/Services/WikiUserEmailChecker.php           | 3 +++
 tests/Commands/User/CheckUserEmailExistTest.php | 1 +
 2 files changed, 4 insertions(+)

diff --git a/app/Services/WikiUserEmailChecker.php b/app/Services/WikiUserEmailChecker.php
index 6efa4e69..6a653578 100644
--- a/app/Services/WikiUserEmailChecker.php
+++ b/app/Services/WikiUserEmailChecker.php
@@ -46,7 +46,10 @@ private function emailExists(PDO $pdo, string $dbName, string $table, string $em
         $stmt = $pdo->prepare("
             SELECT 1
             FROM {$dbName}.{$table}
+
+            -- converting from tinyblob data type, see https://github.com/wbstack/api/blob/main/database/mw/new/mw1.43-wbs2.sql#L1006
             WHERE LOWER(CONVERT(user_email USING utf8mb4)) = LOWER(:email)
+
             LIMIT 1
         ");
 
diff --git a/tests/Commands/User/CheckUserEmailExistTest.php b/tests/Commands/User/CheckUserEmailExistTest.php
index 98dfd20d..8d94da04 100644
--- a/tests/Commands/User/CheckUserEmailExistTest.php
+++ b/tests/Commands/User/CheckUserEmailExistTest.php
@@ -9,6 +9,7 @@
 
 class CheckUserEmailExistTest extends TestCase {
     protected function tearDown(): void {
+        // delete all users
         User::query()->delete();
     }