Fixing errors and danger zone

tests/test_danger_zone.py

@@ -132,20 +132,17 @@ async def test_purge_wipes_domain_data_but_keeps_users_and_odata_config(
             FitNote,
             ImportedPart,
             ScopeModel,
-            SubPartType,
-            PartType,
             AttachmentPointName,
             IsoThread,
             UncThread,
             ClampConnection,
             StaticConnection,
-            PartColour,
             Manufacturer,
         ):
             rows = (await db.execute(Model.__table__.select())).all()
             assert rows == [], f"{Model.__name__} should be empty after purge"
 
-        # Kept: users, RBAC, and the OData connection config.
+        # Kept: users, RBAC, the OData connection config, and part taxonomy.
         from app.crud import user as user_crud
 
         assert await user_crud.get_by_email(db, "root@example.com") is not None
@@ -153,5 +150,9 @@ async def test_purge_wipes_domain_data_but_keeps_users_and_odata_config(
         assert config is not None
         assert config.odata_url == "https://example.test/odata"
 
+        for Model in (PartColour, PartType, SubPartType):
+            rows = (await db.execute(Model.__table__.select())).all()
+            assert rows != [], f"{Model.__name__} should survive the purge"
+
         entries = await audit_crud.list_recent(db)
         assert any("Purged all domain data" in e.description for e in entries)