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/models.py

@@ -162,6 +162,49 @@ class FactOfstedInspection(Base):
     report_url = Column(Text)
 
 
+class FactOfstedLatest(Base):
+    """Current Ofsted status — one row per URN (pipeline: int_ofsted_latest).
+
+    `current_grade` is the overall grade still in force, dated by the
+    inspection that awarded or confirmed it; `latest_visit_*` is the school's
+    most recent inspection of any kind.
+    """
+    __tablename__ = "fact_ofsted_latest"
+    __table_args__ = MARTS
+
+    urn = Column(Integer, primary_key=True)
+    latest_visit_date = Column(Date)
+    latest_visit_kind = Column(String(20))
+    latest_visit_outcome = Column(String(100))
+    current_grade = Column(Integer)
+    current_grade_date = Column(Date)
+    current_grade_basis = Column(String(20))
+    graded_inspection_date = Column(Date)
+    ungraded_inspection_date = Column(Date)
+    rc_inspection_date = Column(Date)
+    inspection_type = Column(String(100))
+    framework = Column(String(20))
+    overall_effectiveness = Column(Integer)
+    quality_of_education = Column(Integer)
+    behaviour_attitudes = Column(Integer)
+    personal_development = Column(Integer)
+    leadership_management = Column(Integer)
+    early_years_provision = Column(Integer)
+    sixth_form_provision = Column(Integer)
+    ungraded_outcome = Column(String(100))
+    ungraded_grade = Column(Integer)
+    rc_safeguarding_met = Column(Boolean)
+    rc_inclusion = Column(Integer)
+    rc_curriculum_teaching = Column(Integer)
+    rc_achievement = Column(Integer)
+    rc_attendance_behaviour = Column(Integer)
+    rc_personal_development = Column(Integer)
+    rc_leadership_governance = Column(Integer)
+    rc_early_years = Column(Integer)
+    rc_sixth_form = Column(Integer)
+    report_url = Column(Text)
+
+
 class FactAdmissions(Base):
     """School admissions — one row per URN per year."""
     __tablename__ = "fact_admissions"