perf(finance): 优化财务仪表盘聚合查询

backend/internal/modules/adminfinance/subquery.go

@@ -50,11 +50,11 @@ func ownerWalletIncomeForSettledOrdersSubquery(db *gorm.DB, query DashboardQuery
 // paymentOriginalAmountForRefundsInRangeSubquery 仅为当前区间内的退款单回查原支付金额。
 // 退款统计原先会对全部历史支付单按 order_id 聚合；数据增长后这部分即使只看一天也会很慢。
 func paymentOriginalAmountForRefundsInRangeSubquery(db *gorm.DB, query DashboardQuery) *gorm.DB {
-	refundOrders := db.Table("payment_orders AS refund").
+	refundOrders := db.Table("payment_orders AS refund USE INDEX (idx_payment_orders_dashboard_created)").
 		Select("DISTINCT refund.order_id").
 		Where("refund.biz_type IN ? AND refund.status = ?", refundBizTypes(), "refunded").
 		Where("refund.created_at >= ? AND refund.created_at <= ?", query.StartDate, query.EndDate)
-	return db.Table("payment_orders AS paid").
+	return db.Table("payment_orders AS paid USE INDEX (idx_payment_orders_dashboard_order)").
 		Select("paid.order_id, MAX(paid.amount_cent) AS amount_cent").
 		Joins("JOIN (?) AS refund_order ON refund_order.order_id = paid.order_id", refundOrders).
 		Where("paid.biz_type IN ? AND paid.status = ?", payBizTypes(), "paid").