Add final tables for two dashboards

jaffle_shop/models/final/finance/_models.yml

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+version: 2
+
+exposures:
+  - name: customer_lifetime_returns_value_dashboard
+    label: Customer lifetime returns value dashboard
+    description: A dashboard for the lifetime value (total amount) of returns from each customer.
+    type: dashboard
+    url: https://prod-apnortheast-a.online.tableau.com/#/site/octopusenergyjapan/home/customerlifetimereturns
+    owner:
+      email: "[email protected]"
+    depends_on:
+      - ref('fnl_finance_customerlifetimereturns')
+
+models:
+  - name: fnl_finance_customerlifetimereturns
+    meta:
+      owner: "[email protected]"
+      team_owner: '!subteam^S02GPV1135F' #@dbt_gatekeepers
+    description: |
+      Table with the total sales for each customer.
+    columns:
+      - name: customer_id
+        description: Unique customer id.
+        tests:
+          - unique
+          - not_null
+      - name: customer_lifetime_returns
+        description: Total value of all orders returned by customer.

jaffle_shop/models/final/finance/fnl_finance_customerlifetimereturns.sql

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+SELECT
+  customer_id
+  , SUM(amount) as customer_lifetime_returns
+FROM {{ ref('wh_orders') }}
+WHERE status = 'returned'
+GROUP BY customer_id

jaffle_shop/models/final/sales/_models.yml

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+version: 2
+
+exposures:
+  - name: new_customers_dashboard
+    label: Montlhly new customers dashboard
+    description: A dashboard for the number of new customers making first orders each month.
+    type: dashboard
+    url: https://prod-apnortheast-a.online.tableau.com/#/site/octopusenergyjapan/home/monthlynewcustomers
+    owner:
+      email: "[email protected]"
+    depends_on:
+      - ref('fnl_sales_newcustomers')
+
+models:
+  - name: fnl_sales_newcustomers
+    meta:
+      owner: "[email protected]"
+      team_owner: '!subteam^S02GPV1135F' #@dbt_gatekeepers
+    description: |
+      Count of new customers (i.e. ones making their first order) each month. 
+    columns:
+      - name: year_month
+        description: Year and month.
+        tests:
+          - unique
+          - not_null
+      - name: new_customers
+        description: Number of new customers making first orders that month.

jaffle_shop/models/final/sales/fnl_sales_newcustomers.sql

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+WITH customer_first_orders AS (
+  SELECT
+    DATE_TRUNC('MONTH', first_order) AS year_month
+  FROM {{ ref('wh_customers') }}
+  WHERE first_order IS NOT NULL
+)
+
+SELECT
+    year_month
+    , COUNT(1) AS new_customers
+FROM customer_first_orders
+GROUP BY year_month