feat(cube): 在订单模型中添加创建时间统计

添加订单的首次和最后创建时间统计字段，用于分析客户订单时间分布

container/cube/conf/model/cubes/order.yml

@@ -153,7 +153,12 @@ cubes:
       - name: total
         sql: total
         type: sum
-
+      - name: last_created_at
+        sql: date_created
+        type: max
+      - name: first_created_at
+        sql: date_created
+        type: min
     pre_aggregations:
       # Pre-aggregation definitions go here.
       # Learn more in the documentation: https://cube.dev/docs/caching/pre-aggregations/getting-started

container/cube/query/customer_order_price_sum.json

@@ -1,7 +1,8 @@
 {
   "measures": [
     "order.total",
-    "order.count"
+    "order.count",
+    "order.last_created_at"
   ],
   "dimensions": [
     "order.customer_email"