修复两个问题

src/Payment/OrderRepositoryCore.php

@@ -244,7 +244,7 @@ trait OrderRepositoryCore {
     public function expire_pending_orders(?int $user_id = null): int {
         global $wpdb;
 
-        $where = "status IN ('created', 'pending') AND expires_at IS NOT NULL AND expires_at <> '' AND expires_at <= %s";
+        $where = "status IN ('created', 'pending') AND expires_at IS NOT NULL AND expires_at <= %s";
         $params = [gmdate('Y-m-d H:i:s')];
         if ($user_id !== null && $user_id > 0) {
             $where .= ' AND user_id = %d';
@@ -298,7 +298,10 @@ trait OrderRepositoryCore {
 			return false;
 		}
 		if (
-			$new_status === \AKSRT\Core\DomainModel::ORDER_STATUS_PAID
+			in_array($new_status, [
+				\AKSRT\Core\DomainModel::ORDER_STATUS_PAID,
+				\AKSRT\Core\DomainModel::ORDER_STATUS_COMPLETED,
+			], true)
 			&& sanitize_key((string) ($preflight['product_type'] ?? '')) === \AKSRT\Core\DomainModel::ORDER_PRODUCT_RECHARGE
 			&& class_exists('\AKSRT\Credits\BalanceService')
 		) {
@@ -579,7 +582,7 @@ trait OrderRepositoryCore {
         // Prefer cancelled_at when set; fall back to created_at for older rows.
         $sql = "DELETE FROM {$table}
                 WHERE status IN ('cancelled', 'expired')
-                  AND COALESCE(NULLIF(cancelled_at, ''), created_at) < %s";
+                  AND COALESCE(cancelled_at, created_at) < %s";
         $deleted = $wpdb->query($wpdb->prepare($sql, $cutoff));
         return $deleted === false ? 0 : (int) $deleted;
     }