fix initial+refresher

public/userarea/cron/send_training_reminders.php

@@ -47,7 +47,8 @@ $sent = 0;
 $skipped = 0;
 $errors = 0;
 
-/* Candidate trainings (with optional override reminder + topic default) */
+/* Candidate trainings (with optional override reminder + topic default).
+   Only the most recent record per (employee, topic) — older history rows skipped. */
 $stmt = $pdo->query("
     SELECT et.id, et.employee_id, et.completed_date, et.next_due_date,
            et.reminder_days, et.delivered_by,
@@ -60,6 +61,13 @@ $stmt = $pdo->query("
     JOIN employees e ON e.id = et.employee_id
     LEFT JOIN auth_users au ON au.id = e.auth_user_id
     WHERE et.next_due_date IS NOT NULL
+      AND NOT EXISTS (
+          SELECT 1 FROM employee_trainings et2
+          WHERE et2.employee_id = et.employee_id
+            AND et2.training_topic_id = et.training_topic_id
+            AND (et2.completed_date > et.completed_date
+                 OR (et2.completed_date = et.completed_date AND et2.id > et.id))
+      )
 ");
 $rows = $stmt->fetchAll(PDO::FETCH_ASSOC);