diff --git a/nowcasting_datamodel/connection.py b/nowcasting_datamodel/connection.py
index 9dc57089..a705e93a 100644
--- a/nowcasting_datamodel/connection.py
+++ b/nowcasting_datamodel/connection.py
@@ -49,7 +49,7 @@ def make_partitions(self):
             ):
                 partition.__table__.create(bind=self.engine)
 
-    def drop_all(self):
+    def __drop_all(self):
         """Drop all partitions and tables"""
         # drop partitions
         for partition in self.partitions:
diff --git a/tests/conftest.py b/tests/conftest.py
index 8ac64929..43359d0d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -52,7 +52,7 @@ def forecasts_all(db_session) -> List[ForecastSQL]:
 
 @pytest.fixture
 def db_connection():
-    url = os.getenv("DB_URL", "sqlite:///test.db")
+    url = "sqlite:///test.db"
 
     connection = DatabaseConnection(url=url, echo=False)
     connection.create_all()
@@ -80,7 +80,7 @@ def db_session(db_connection):
 
 @pytest.fixture
 def db_connection_pv():
-    url = os.getenv("DB_URL_PV", "sqlite:///test_pv.db")
+    url = "sqlite:///test_pv.db"
 
     connection = DatabaseConnection(url=url, base=Base_PV)
     Base_PV.metadata.create_all(connection.engine)