fix: 刷新mv_overview_monthly，修复实收口径不一致

mv_overview_monthly是普通表不是物化视图，需要DELETE+INSERT更新
之前未刷新导致/overview API返回旧数据(6083万 vs bill_fact 6441万)
刷新脚本加入mv_overview_monthly更新步骤

scripts/refresh_materialized_views.sh

@@ -24,6 +24,23 @@ psql -h "$DB_HOST" -p "$DB_PORT" -U "$DB_USER" -d "$DB_NAME" <<EOF
 REFRESH MATERIALIZED VIEW analytics.bill_fact;
 SELECT 'bill_fact refreshed' AS status;
 
+-- 第一层b：总览汇总表（普通表，需DELETE+INSERT）
+DELETE FROM analytics.mv_overview_monthly WHERE month = '${MONTH_START}';
+INSERT INTO analytics.mv_overview_monthly
+SELECT
+  date_trunc('month', closed_at)::date AS month,
+  count(*) AS bill_count,
+  round(sum(received_total)::numeric, 2) AS received,
+  round(avg(received_total)::numeric, 2) AS avg_bill_value,
+  round(avg(CASE WHEN consumption > 0 THEN discount_total::numeric / consumption * 100 ELSE 0 END)::numeric, 2) AS discount_rate_pct,
+  0 AS theoretical_margin_pct,
+  0 AS member_bills,
+  0 AS member_share_pct
+FROM analytics.bill_fact
+WHERE closed_at >= '${MONTH_START}' AND closed_at < ('${MONTH_START}'::date + interval '1 month')
+GROUP BY date_trunc('month', closed_at);
+SELECT 'mv_overview_monthly updated' AS status;
+
 -- 第二层：门店评估
 REFRESH MATERIALIZED VIEW analytics.mv_store_risk_rating_monthly;
 REFRESH MATERIALIZED VIEW analytics.mv_store_theoretical_actual_cost_monthly;