added final models and reverted wh_ suffix change

Author: joshuadias2212

jaffle_shop/models/final/finance/_models.yml

@@ -0,0 +1,15 @@
+version: 2
+
+models:
+  name: fnl_monthly_customer_count
+  meta:
+    owner: kensuke.morris@octoenergy.com
+  description: | 
+    One row per customer count for each month based on their first orders. 
+  columns: 
+    - name: first_order_month
+      description: Primary key
+      tests:
+        - unique
+        - not_null
+

jaffle_shop/models/final/finance/fnl_returned_order_value.sql

@@ -0,0 +1,12 @@
+WITH customer_orders AS (
+  SELECT 
+    customer_id
+    , DATE_FORMAT(first_order, 'MMMM') As order_month
+  FROM {{ ref('wh_customers') }}
+)
+
+SELECT 
+  first_order AS first_order_month
+  , COUNT(*) AS customer_count
+FROM customer_orders
+GROUP BY first_order