diff --git a/app/dao/fact_billing_dao.py b/app/dao/fact_billing_dao.py
index 92e27189e..b27ac7ea1 100644
--- a/app/dao/fact_billing_dao.py
+++ b/app/dao/fact_billing_dao.py
@@ -159,7 +159,7 @@ def fetch_billing_data_for_day(process_day, service_id=None):
                 notification_type=notification_type,
                 start_date=start_date,
                 end_date=end_date,
-                service_id = id_of_service
+                service_id=id_of_service
             )
             # If data has been purged from Notification then use NotificationHistory
             if len(results) == 0:
@@ -285,10 +285,6 @@ def update_fact_billing(data, process_day):
                     data.postage)
     billing_record = create_billing_record(data, rate, process_day)
 
-    FactBilling.query.filter(
-        FactBilling.bst_date == process_day
-    ).delete()
-
     table = FactBilling.__table__
     '''
        This uses the Postgres upsert to avoid race conditions when two threads try to insert
diff --git a/app/dao/fact_notification_status_dao.py b/app/dao/fact_notification_status_dao.py
index 1b9164b73..2836e62df 100644
--- a/app/dao/fact_notification_status_dao.py
+++ b/app/dao/fact_notification_status_dao.py
@@ -38,13 +38,22 @@ def fetch_notification_status_for_day(process_day):
     # if no rows try notificationHistory
     for service_id in service_ids:
         for notification_type in [EMAIL_TYPE, SMS_TYPE, LETTER_TYPE]:
-            table = Notification
-            data_for_service_and_type = query_for_fact_status_data(table, start_date, end_date, notification_type, service_id)
+            data_for_service_and_type = query_for_fact_status_data(
+                table=Notification,
+                start_date=start_date,
+                end_date=end_date,
+                notification_type=notification_type,
+                service_id=service_id
+            )
 
             if len(data_for_service_and_type) == 0:
-                table = NotificationHistory
-                data_for_service_and_type = query_for_fact_status_data(table, start_date, end_date, notification_type, service_id)
-
+                data_for_service_and_type = query_for_fact_status_data(
+                    table=NotificationHistory,
+                    start_date=start_date,
+                    end_date=end_date,
+                    notification_type=notification_type,
+                    service_id=service_id
+                )
             all_data_for_process_day = all_data_for_process_day + data_for_service_and_type
 
     return all_data_for_process_day