fix(backend): serve the current Ofsted status from fact_ofsted_latest

The list query and the batch Ofsted fetch each picked 'the latest row' of fact_ofsted_inspection themselves, and _ofsted_block carried an older ungraded grade forward when the latest graded inspection gave none. All three now read marts.fact_ofsted_latest. List rows: ofsted_grade is the grade still in force, ofsted_grade_date when it was awarded or confirmed, ofsted_date the latest visit. The ofsted block gains current_grade and latest_visit and loses grade_source; overall_effectiveness is the graded inspection's own result. A school with only an inspection stays publishable in the sitemap.

Requires fact_ofsted_latest (PR #183's pipeline run) on the database.

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

backend/tests/test_supplementary_batch.py

@@ -85,12 +85,15 @@ def _ofsted_row(urn, date, oe):
         "framework", "inspection_type", "quality_of_education", "behaviour_attitudes",
         "personal_development", "leadership_management", "early_years_provision",
         "sixth_form_provision", "ungraded_outcome", "ungraded_grade",
+        "ungraded_inspection_date", "rc_inspection_date", "latest_visit_outcome",
         "rc_safeguarding_met", "rc_inclusion", "rc_curriculum_teaching", "rc_achievement",
         "rc_attendance_behaviour", "rc_personal_development", "rc_leadership_governance",
         "rc_early_years", "rc_sixth_form", "report_url",
     )}
-    base.update(urn=urn, inspection_date=types.SimpleNamespace(isoformat=lambda: date),
-                overall_effectiveness=oe, grade_source=None)
+    when = types.SimpleNamespace(isoformat=lambda: date)
+    base.update(urn=urn, graded_inspection_date=when, latest_visit_date=when,
+                latest_visit_kind="graded", overall_effectiveness=oe,
+                current_grade=oe, current_grade_date=when, current_grade_basis="graded")
     return types.SimpleNamespace(**base)
 
 
@@ -114,10 +117,9 @@ def _dist_row(urn, year, distance_m, route_count=1):
 
 def test_one_query_per_table_and_latest_row_per_urn():
     rows = {
-        # URN 1 has two Ofsted rows; the batch must keep the most recent (2023).
-        "FactOfstedInspection": [
+        # The mart holds one current Ofsted status per URN.
+        "FactOfstedLatest": [
             _ofsted_row(1, "2023-01-01", 2),
-            _ofsted_row(1, "2019-01-01", 3),
             _ofsted_row(2, "2021-06-01", 1),
         ],
         "FactAdmissions": [_adm_row(1, 202526), _adm_row(1, 202627), _adm_row(2, 202627)],
@@ -142,14 +144,14 @@ def test_one_query_per_table_and_latest_row_per_urn():
     assert sorted(session.queries) == [
         "FactAdmissionDistance", "FactAdmissions", "FactDeprivation",
         "FactFinance", "FactKs4Destinations", "FactKs5Destinations",
-        "FactOfstedInspection", "FactPupilCharacteristics",
+        "FactOfstedLatest", "FactPupilCharacteristics",
     ]
 
     # A school with no destination rows gets null, not an empty shell — the
     # frontend renders the section from the block's presence.
     assert out[1]["destinations"] is None
 
-    # Latest Ofsted kept per URN
+    # Each URN's current Ofsted status
     assert out[1]["ofsted"]["overall_effectiveness"] == 2
     assert out[2]["ofsted"]["overall_effectiveness"] == 1
 
@@ -175,7 +177,7 @@ def test_one_query_per_table_and_latest_row_per_urn():
 
 
 def test_single_wrapper_matches_batch(monkeypatch):
-    session = _FakeSession({"FactOfstedInspection": [_ofsted_row(5, "2022-01-01", 2)]})
+    session = _FakeSession({"FactOfstedLatest": [_ofsted_row(5, "2022-01-01", 2)]})
     single = data_loader.get_supplementary_data(session, 5)
     assert single["ofsted"]["overall_effectiveness"] == 2
     assert single["admissions_history"] == []