feat(dbt): Add dbt models

models/customers.sql

@@ -0,0 +1,69 @@
+with customers as (
+
+    select * from {{ ref('stg_customers') }}
+
+),
+
+orders as (
+
+    select * from {{ ref('stg_orders') }}
+
+),
+
+payments as (
+
+    select * from {{ ref('stg_payments') }}
+
+),
+
+customer_orders as (
+
+        select
+        customer_id,
+
+        min(order_date) as first_order,
+        max(order_date) as most_recent_order,
+        count(order_id) as number_of_orders
+    from orders
+
+    group by customer_id
+
+),
+
+customer_payments as (
+
+    select
+        orders.customer_id,
+        sum(amount) as total_amount
+
+    from payments
+
+    left join orders on
+         payments.order_id = orders.order_id
+
+    group by orders.customer_id
+
+),
+
+final as (
+
+    select
+        customers.customer_id,
+        customers.first_name,
+        customers.last_name,
+        customer_orders.first_order,
+        customer_orders.most_recent_order,
+        customer_orders.number_of_orders,
+        customer_payments.total_amount as customer_lifetime_value
+
+    from customers
+
+    left join customer_orders
+        on customers.customer_id = customer_orders.customer_id
+
+    left join customer_payments
+        on  customers.customer_id = customer_payments.customer_id
+
+)
+
+select * from final