feat: migrate backend to marts schema, update EES tap for verified datasets

Pipeline:
- EES tap: split KS4 into performance + info streams, fix admissions filename
  (SchoolLevel keyword match), fix census filename (yearly suffix), remove
  phonics (no school-level data on EES), change endswith → in for matching
- stg_ees_ks4: rewrite to filter long-format data and extract Attainment 8,
  Progress 8, EBacc, English/Maths metrics; join KS4 info for context
- stg_ees_admissions: map real CSV columns (total_number_places_offered, etc.)
- stg_ees_census: update source reference, stub with TODO for data columns
- Remove stg_ees_phonics, fact_phonics (no school-level EES data)
- Add ees_ks4_performance + ees_ks4_info sources, remove ees_ks4 + ees_phonics
- Update int_ks4_with_lineage + fact_ks4_performance with new KS4 columns
- Annual EES DAG: remove stg_ees_phonics+ from selector

Backend:
- models.py: replace all models to point at marts.* tables with schema='marts'
  (DimSchool, DimLocation, KS2Performance, FactOfstedInspection, etc.)
- data_loader.py: rewrite load_school_data_as_dataframe() using raw SQL joining
  dim_school + dim_location + fact_ks2_performance; update get_supplementary_data()
- database.py: remove migration machinery, keep only connection setup
- app.py: remove check_and_migrate_if_needed, remove /api/admin/reimport-ks2
  endpoints (pipeline handles all imports)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pipeline/transform/models/intermediate/int_ks4_with_lineage.sql

@@ -4,16 +4,14 @@ with current_ks4 as (
     select
         urn as current_urn,
         urn as source_urn,
-        year,
-        total_pupils,
-        progress_8_score,
+        year, total_pupils, eligible_pupils, prior_attainment_avg,
         attainment_8_score,
-        ebacc_entry_pct,
-        ebacc_achievement_pct,
-        english_strong_pass_pct,
-        maths_strong_pass_pct,
-        english_maths_strong_pass_pct,
-        staying_in_education_pct
+        progress_8_score, progress_8_lower_ci, progress_8_upper_ci,
+        progress_8_english, progress_8_maths, progress_8_ebacc, progress_8_open,
+        english_maths_strong_pass_pct, english_maths_standard_pass_pct,
+        ebacc_entry_pct, ebacc_strong_pass_pct, ebacc_standard_pass_pct, ebacc_avg_score,
+        gcse_grade_91_pct,
+        sen_pct, sen_ehcp_pct, sen_support_pct
     from {{ ref('stg_ees_ks4') }}
 ),
 
@@ -21,16 +19,14 @@ predecessor_ks4 as (
     select
         lin.current_urn,
         ks4.urn as source_urn,
-        ks4.year,
-        ks4.total_pupils,
-        ks4.progress_8_score,
+        ks4.year, ks4.total_pupils, ks4.eligible_pupils, ks4.prior_attainment_avg,
         ks4.attainment_8_score,
-        ks4.ebacc_entry_pct,
-        ks4.ebacc_achievement_pct,
-        ks4.english_strong_pass_pct,
-        ks4.maths_strong_pass_pct,
-        ks4.english_maths_strong_pass_pct,
-        ks4.staying_in_education_pct
+        ks4.progress_8_score, ks4.progress_8_lower_ci, ks4.progress_8_upper_ci,
+        ks4.progress_8_english, ks4.progress_8_maths, ks4.progress_8_ebacc, ks4.progress_8_open,
+        ks4.english_maths_strong_pass_pct, ks4.english_maths_standard_pass_pct,
+        ks4.ebacc_entry_pct, ks4.ebacc_strong_pass_pct, ks4.ebacc_standard_pass_pct, ks4.ebacc_avg_score,
+        ks4.gcse_grade_91_pct,
+        ks4.sen_pct, ks4.sen_ehcp_pct, ks4.sen_support_pct
     from {{ ref('stg_ees_ks4') }} ks4
     inner join {{ ref('int_school_lineage') }} lin
         on ks4.urn = lin.predecessor_urn

pipeline/transform/models/intermediate/int_pupil_chars_merged.sql

@@ -1,18 +1,8 @@
 -- Intermediate model: Merged pupil characteristics from census data
+-- TODO: Expand once census data columns are verified and added to stg_ees_census
 
 select
     urn,
     year,
-    fsm_pct,
-    sen_support_pct,
-    sen_ehcp_pct,
-    eal_pct,
-    disadvantaged_pct,
-    ethnicity_white_pct,
-    ethnicity_asian_pct,
-    ethnicity_black_pct,
-    ethnicity_mixed_pct,
-    ethnicity_other_pct,
-    class_size_avg,
-    stability_pct
+    phase_type_grouping
 from {{ ref('stg_ees_census') }}