Insert delivery record to t_send_email_log on successful send

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/send_email.php

@@ -352,6 +352,11 @@ foreach ($rows as $row) {
                 T_SendEmailLastUpdated = NOW()
             WHERE T_SendEmailID = ?
         ")->execute([$id]);
+        $pdo->prepare("
+            INSERT INTO t_send_email_log
+                (T_SendEmailLogT_SendEmailID, T_SendEmailLogRecepient, T_SendEmailLogStatus, T_SendEmailLogResponse, T_SendEmailLogCreated)
+            VALUES (?, ?, 'D', NULL, NOW())
+        ")->execute([$id, $recipient]);
     } else {
         log_msg("  Error: {$err}");
         $pdo->prepare("