temp: add example model with average per month

models/grading/avg_aproving_students_per_month.sql

@@ -0,0 +1,35 @@
+{{
+    config(
+        materialized="materialized_view",
+        schema=env_var("ASPECTS_XAPI_DATABASE", "xapi"),
+        engine=get_engine("ReplacingMergeTree()"),
+        primary_key="(year, month)",
+        order_by="(year, month)",
+        partition_by="",
+    )
+}}
+
+
+with
+    grades_average as (
+        select
+            course_key,
+            monthName(emission_time) as month_name,
+            toYear(emission_time) as year,
+            case
+                when verb_id = 'http://adlnet.gov/expapi/verbs/passed' then 1 else 0
+            end as approving,
+            count(1) as total
+        from xapi.grading_events
+        where
+            verb_id in (
+                'http://adlnet.gov/expapi/verbs/passed',
+                'http://adlnet.gov/expapi/verbs/failed'
+            )
+        group by course_key, year, month_name, approving
+        having approving = 1
+    )
+
+select year, month_name, avg(total)
+from grades_average
+group by year, month_name