feat: 增加订单筛选功能，添加按金额区间筛选的数据库索引

backend/app/services/order_test.go

@@ -396,6 +396,130 @@ func (s *OrderTestSuite) Test_AdminOrderPage() {
 			So(err, ShouldBeNil)
 			So(pager.Total, ShouldEqual, 1)
 		})
+
+		Convey("组合筛选：user_id + status + amount_paid 区间 + content_id", func() {
+			s.truncate(ctx, models.TableNameOrderItem, models.TableNameOrder)
+
+			statusPaid := consts.OrderStatusPaid
+			userID := int64(7)
+			contentID := int64(777)
+
+			// 命中：user_id=7, status=paid, amount_paid=500, content_id=777
+			oHit := &models.Order{
+				TenantID:   tenantID,
+				UserID:     userID,
+				Type:       consts.OrderTypeContentPurchase,
+				Status:     consts.OrderStatusPaid,
+				Currency:   consts.CurrencyCNY,
+				AmountPaid: 500,
+				Snapshot:   types.JSON([]byte("{}")),
+				PaidAt:     now,
+				CreatedAt:  now,
+				UpdatedAt:  now,
+			}
+			So(oHit.Create(ctx), ShouldBeNil)
+			So((&models.OrderItem{
+				TenantID:      tenantID,
+				UserID:        userID,
+				OrderID:       oHit.ID,
+				ContentID:     contentID,
+				ContentUserID: 1,
+				AmountPaid:    500,
+				Snapshot:      types.JSON([]byte("{}")),
+				CreatedAt:     now,
+				UpdatedAt:     now,
+			}).Create(ctx), ShouldBeNil)
+
+			// 不命中：amount_paid 不在区间
+			oNoAmount := &models.Order{
+				TenantID:   tenantID,
+				UserID:     userID,
+				Type:       consts.OrderTypeContentPurchase,
+				Status:     consts.OrderStatusPaid,
+				Currency:   consts.CurrencyCNY,
+				AmountPaid: 50,
+				Snapshot:   types.JSON([]byte("{}")),
+				PaidAt:     now,
+				CreatedAt:  now,
+				UpdatedAt:  now,
+			}
+			So(oNoAmount.Create(ctx), ShouldBeNil)
+			So((&models.OrderItem{
+				TenantID:      tenantID,
+				UserID:        userID,
+				OrderID:       oNoAmount.ID,
+				ContentID:     contentID,
+				ContentUserID: 1,
+				AmountPaid:    50,
+				Snapshot:      types.JSON([]byte("{}")),
+				CreatedAt:     now,
+				UpdatedAt:     now,
+			}).Create(ctx), ShouldBeNil)
+
+			// 不命中：status 不同
+			oNoStatus := &models.Order{
+				TenantID:   tenantID,
+				UserID:     userID,
+				Type:       consts.OrderTypeContentPurchase,
+				Status:     consts.OrderStatusCreated,
+				Currency:   consts.CurrencyCNY,
+				AmountPaid: 500,
+				Snapshot:   types.JSON([]byte("{}")),
+				PaidAt:     now,
+				CreatedAt:  now,
+				UpdatedAt:  now,
+			}
+			So(oNoStatus.Create(ctx), ShouldBeNil)
+			So((&models.OrderItem{
+				TenantID:      tenantID,
+				UserID:        userID,
+				OrderID:       oNoStatus.ID,
+				ContentID:     contentID,
+				ContentUserID: 1,
+				AmountPaid:    500,
+				Snapshot:      types.JSON([]byte("{}")),
+				CreatedAt:     now,
+				UpdatedAt:     now,
+			}).Create(ctx), ShouldBeNil)
+
+			// 不命中：user_id 不同
+			oNoUser := &models.Order{
+				TenantID:   tenantID,
+				UserID:     8,
+				Type:       consts.OrderTypeContentPurchase,
+				Status:     consts.OrderStatusPaid,
+				Currency:   consts.CurrencyCNY,
+				AmountPaid: 500,
+				Snapshot:   types.JSON([]byte("{}")),
+				PaidAt:     now,
+				CreatedAt:  now,
+				UpdatedAt:  now,
+			}
+			So(oNoUser.Create(ctx), ShouldBeNil)
+			So((&models.OrderItem{
+				TenantID:      tenantID,
+				UserID:        8,
+				OrderID:       oNoUser.ID,
+				ContentID:     contentID,
+				ContentUserID: 1,
+				AmountPaid:    500,
+				Snapshot:      types.JSON([]byte("{}")),
+				CreatedAt:     now,
+				UpdatedAt:     now,
+			}).Create(ctx), ShouldBeNil)
+
+			min := int64(100)
+			max := int64(900)
+			pager, err := Order.AdminOrderPage(ctx, tenantID, &dto.AdminOrderListFilter{
+				UserID:        &userID,
+				Status:        &statusPaid,
+				ContentID:     &contentID,
+				AmountPaidMin: &min,
+				AmountPaidMax: &max,
+			})
+			So(err, ShouldBeNil)
+			So(pager.Total, ShouldEqual, 1)
+		})
 	})
 }
 

backend/database/migrations/20251218164000_orders_amount_paid_index.sql

@@ -0,0 +1,11 @@
+-- +goose Up
+-- +goose StatementBegin
+-- orders.amount_paid：为“按金额区间筛选订单”提供索引（租户内隔离维度）
+CREATE INDEX IF NOT EXISTS ix_orders_tenant_amount_paid ON orders(tenant_id, amount_paid);
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DROP INDEX IF EXISTS ix_orders_tenant_amount_paid;
+-- +goose StatementEnd
+