diff --git a/backend/tests/test_sixth_form_flag.py b/backend/tests/test_sixth_form_flag.py
index fb7c34c..af32799 100644
--- a/backend/tests/test_sixth_form_flag.py
+++ b/backend/tests/test_sixth_form_flag.py
@@ -121,11 +121,6 @@ def test_detail_payload_serializes_numpy_bool(monkeypatch):
     assert resp.json()["school_info"]["has_sixth_form"] is True
 
 
-class _FakeProgrammingError(Exception):
-    """Stand-in for sqlalchemy.exc.ProgrammingError wrapping psycopg2's
-    UndefinedColumn, without needing a real DB connection to construct one."""
-
-
 def test_load_school_data_survives_missing_has_sixth_form_column(monkeypatch):
     """Real prod state until the nightly pipeline first rebuilds the mart:
     marts.dim_school lacks has_sixth_form entirely. The first query raises