chore(init): 初始化解忧商行项目并完成 Phase 0 基座

backend/internal/modules/adminfinance/subquery.go

@@ -0,0 +1,62 @@
+package adminfinance
+
+import (
+	"gorm.io/gorm"
+)
+
+func acceptedCheckoutForOrdersSubquery(db *gorm.DB, orderIDs []uint64) *gorm.DB {
+	latest := db.Table("order_checkouts").Select("MAX(id) AS id").
+		Where("status = ? AND order_id IN ?", "accepted", orderIDs).
+		Group("order_id")
+	return db.Table("order_checkouts AS oc").
+		Select("oc.*").
+		Joins("JOIN (?) AS latest ON latest.id = oc.id", latest)
+}
+
+func orderPaymentForOrdersSubquery(db *gorm.DB, orderIDs []uint64) *gorm.DB {
+	return db.Table("payment_orders").
+		Select(`order_id,
+			COALESCE(SUM(CASE WHEN biz_type = 'order_pay' AND status = 'paid' THEN amount_cent ELSE 0 END), 0) AS paid_amount_cent,
+			COALESCE(SUM(CASE WHEN biz_type IN ? AND status = 'refunded' THEN amount_cent ELSE 0 END), 0) AS refunded_amount_cent,
+			COALESCE(SUM(CASE WHEN biz_type IN ? AND status = 'refunding' THEN amount_cent ELSE 0 END), 0) AS refunding_amount_cent,
+			COALESCE(SUM(CASE WHEN biz_type IN ? AND status = 'failed' THEN amount_cent ELSE 0 END), 0) AS failed_refund_amount_cent`,
+			refundBizTypes(), refundBizTypes(), refundBizTypes()).
+		Where("order_id IN ?", orderIDs).
+		Group("order_id")
+}
+
+func ownerWalletIncomeForOrdersSubquery(db *gorm.DB, orderIDs []uint64) *gorm.DB {
+	return db.Table("wallet_ledger").
+		Select("order_id, COALESCE(SUM(amount_cent), 0) AS owner_wallet_income_amount_cent").
+		Where("direction = ? AND biz_type IN ? AND order_id IN ?", "in", []string{"owner_income", "deposit_compensation", "arbitration_owner_income"}, orderIDs).
+		Group("order_id")
+}
+
+// ownerWalletIncomeForSettledOrdersSubquery 只为当前仪表盘区间内已结算订单汇总钱包入账。
+// 原先的全表分组会随钱包流水积累持续变慢；此处先通过 settled_at 缩小订单集合，
+// 再使用 wallet_ledger.order_id 索引关联对应流水。
+func ownerWalletIncomeForSettledOrdersSubquery(db *gorm.DB, query DashboardQuery) *gorm.DB {
+	return db.Table("rental_orders AS scoped_order").
+		Select(`scoped_order.id AS order_id,
+			COALESCE(SUM(wallet.amount_cent), 0) AS owner_wallet_income_amount_cent`).
+		Joins(`LEFT JOIN wallet_ledger AS wallet
+			ON wallet.order_id = scoped_order.id
+			AND wallet.direction = ?
+			AND wallet.biz_type IN ?`, "in", []string{"owner_income", "deposit_compensation", "arbitration_owner_income"}).
+		Where("scoped_order.settled_at >= ? AND scoped_order.settled_at <= ?", query.StartDate, query.EndDate).
+		Group("scoped_order.id")
+}
+
+// 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").
+		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").
+		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").
+		Group("paid.order_id")
+}