diff --git a/routes/settings.py b/routes/settings.py
index 077ba13..0cc2397 100644
--- a/routes/settings.py
+++ b/routes/settings.py
@@ -75,7 +75,7 @@ def update_css_settings(payload: CSSSettingsPayload, db: Session = Depends(get_d
         ]
     except ValueError as exc:
         raise HTTPException(
-            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
             detail=str(exc),
         ) from exc
     return CSSSettingsResponse(
diff --git a/tests/unit/conftest.py b/tests/unit/conftest.py
index 39e80c4..0ecb00e 100644
--- a/tests/unit/conftest.py
+++ b/tests/unit/conftest.py
@@ -68,10 +68,13 @@ def setup_database() -> Generator[None, None, None]:
 
 @pytest.fixture()
 def db_session() -> Generator[Session, None, None]:
+    Base.metadata.drop_all(bind=engine)
+    Base.metadata.create_all(bind=engine)
     session = TestingSessionLocal()
     try:
         yield session
     finally:
+        session.rollback()
         session.close()