diff --git a/src/AKSRT/Credits/Signin.php b/src/AKSRT/Credits/Signin.php
index fca51f9c..02ea8c4b 100644
--- a/src/AKSRT/Credits/Signin.php
+++ b/src/AKSRT/Credits/Signin.php
@@ -159,8 +159,15 @@ class Signin {
         // Keep lightweight meta for header/badge consumers (zibll checkin_all_day).
         update_user_meta($user_id, 'aksrt_signin_' . $today_str, 1);
         $all_day = (int) get_user_meta($user_id, 'aksrt_checkin_all_day', true);
-        update_user_meta($user_id, 'aksrt_checkin_all_day', $all_day + 1);
+        if ($all_day <= 0) {
+            // Fallback to zibll key if migrated users only have that meta.
+            $all_day = (int) get_user_meta($user_id, 'checkin_all_day', true);
+        }
+        $all_day = $all_day + 1;
+        update_user_meta($user_id, 'aksrt_checkin_all_day', $all_day);
+        update_user_meta($user_id, 'checkin_all_day', $all_day); // zibll alias
         update_user_meta($user_id, 'aksrt_checkin_continuous_day', $new_streak);
+        update_user_meta($user_id, 'checkin_continuous_day', $new_streak); // zibll alias
 
         return new \WP_REST_Response([
             'success' => true,