diff --git a/wwwroot/billing.dspy b/wwwroot/billing.dspy
index d9f426a..0f327c9 100644
--- a/wwwroot/billing.dspy
+++ b/wwwroot/billing.dspy
@@ -27,6 +27,7 @@ where a.orgid = ${orgid}$
 	and d.acc_date >= ${start_date}$
 	and d.acc_date <= ${end_date}$"""
 	rows = await sor.sqlExe(sql, ns)
+	debug(f'billing rows type={type(rows).__name__}, is_list={isinstance(rows, list)}, len={len(rows) if isinstance(rows, list) else "N/A"}')
 	
 	# 统计数据 — 独立 ns 避免被 sqlor 修改
 	stats_ns = {