perf(finance): 优化财务仪表盘聚合查询

backend/migrations/000091_finance_dashboard_query_indexes.sql

@@ -0,0 +1,35 @@
+-- +goose Up
+-- 财务仪表盘按时间窗口聚合支付、退款和结算数据。
+-- 支付索引避免退款统计扫描全部历史状态；结算与结账索引避免日报聚合回表。
+ALTER TABLE payment_orders
+  ADD KEY idx_payment_orders_dashboard_created (created_at, biz_type, status, order_id, amount_cent),
+  ADD KEY idx_payment_orders_dashboard_order (order_id, biz_type, status, amount_cent);
+
+ALTER TABLE rental_orders
+  ADD KEY idx_rental_orders_dashboard_settled (
+    settled_at,
+    id,
+    settlement_mode,
+    offline_settlement_status,
+    offline_settlement_amount_cent,
+    refund_status
+  );
+
+ALTER TABLE order_checkouts
+  ADD KEY idx_order_checkouts_dashboard_accepted (
+    status,
+    order_id,
+    platform_fee_cent,
+    owner_income_amount_cent
+  );
+
+-- +goose Down
+ALTER TABLE order_checkouts
+  DROP KEY idx_order_checkouts_dashboard_accepted;
+
+ALTER TABLE rental_orders
+  DROP KEY idx_rental_orders_dashboard_settled;
+
+ALTER TABLE payment_orders
+  DROP KEY idx_payment_orders_dashboard_order,
+  DROP KEY idx_payment_orders_dashboard_created;