feat(dbt): fact_ks4_la_averages from DfE's LA rows (H2)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pipeline/transform/models/marts/_marts_schema.yml

@@ -279,11 +279,24 @@ models:
         tests: [not_null, unique]
 
   - name: fact_ks4_national_averages
-    description: Computed national KS4 averages (means across state schools in our dataset — not official DfE figures) — one row per academic year
+    description: Official DfE KS4 national headline averages (England, all state-funded schools, all pupils) — one row per academic year
     columns:
       - name: year
         tests: [not_null, unique]
 
+  - name: fact_ks4_la_averages
+    description: Official DfE KS4 local-authority averages (all state-funded schools, all pupils) — one row per academic year and LA; la_code is the GIAS LA code
+    columns:
+      - name: year
+        tests: [not_null]
+      - name: la_code
+        tests: [not_null]
+      - name: la_name
+        tests: [not_null]
+    tests:
+      - unique:
+          column_name: "year || '-' || la_code"
+
   - name: fact_deprivation
     description: IDACI deprivation index — one row per URN
     columns:

pipeline/transform/models/marts/fact_ks4_la_averages.sql

@@ -0,0 +1,22 @@
+{{ config(materialized='table') }}
+
+-- Mart: OFFICIAL DfE KS4 local-authority averages — one row per academic year
+-- and LA (all state-funded schools, all pupils), from the same EES data set
+-- as fact_ks4_national_averages. Feeds "vs LA avg" on search rows and map
+-- cards, replacing a mean the API took over every school in the LA,
+-- independent and special included (audit H2). la_code is the GIAS LA code.
+
+select
+    year,
+    la_code,
+    la_name,
+    attainment_8_score,
+    progress_8_score,
+    english_maths_standard_pass_pct,
+    english_maths_strong_pass_pct,
+    ebacc_entry_pct,
+    ebacc_standard_pass_pct,
+    ebacc_strong_pass_pct,
+    ebacc_avg_score
+from {{ ref('stg_ees_ks4_la') }}
+order by year, la_code