k_student_assess needs to include stu unique id (#89)

* k_student_assess needs to include stu unique id

* alphabetize keys

* Update CHANGELOG.md

---------

Co-authored-by: Jay Kaiser <jayckaiser@gmail.com>

Author: rlittle08

CHANGELOG.md

@@ -4,6 +4,7 @@
 - Add (optional) support for incremental materialization of most expensive stg models
 ## Under the hood
 ## Fixes
+- Fix unique key `k_student_assessment` in `stg_ef3__student_assessments` to include `student_unique_id` (relevant only where `student_assessment_identifier` is not on its own unique)
 
 # edu_edfi_source v0.4.6
 ## Fixes

models/staging/edfi_3/stage/stg_ef3__student_assessments.sql

@@ -17,9 +17,10 @@ keyed as (
             ['tenant_code',
             'api_year',
             'lower(academic_subject)',
-            'lower(student_assessment_identifier)',
             'lower(assessment_identifier)',
-            'lower(namespace)']
+            'lower(namespace)',
+            'lower(student_assessment_identifier)',
+            'lower(student_unique_id)']
         ) }} as k_student_assessment,
         {{ gen_skey('k_assessment', extras = ['academic_subject']) }},
         {{ gen_skey('k_student') }},