A few code style tweaks to adhere to standard for better maintainable code.

tests/app/db.py

@@ -1,34 +1,33 @@
 from datetime import datetime
 import uuid
 
-from app import db, create_random_identifier
+from app import db
 from app.dao.jobs_dao import dao_create_job
 from app.dao.service_inbound_api_dao import save_service_inbound_api
 from app.models import (
     ApiKey,
-    EMAIL_TYPE,
-    SMS_TYPE,
-    KEY_TYPE_NORMAL,
-    Service,
-    User,
-    Template,
-    MonthlyBilling,
-    Notification,
-    ScheduledNotification,
-    ServicePermission,
-    Rate,
-    Job,
     InboundSms,
     InboundNumber,
+    Job,
+    MonthlyBilling,
+    Notification,
+    NotificationEmailReplyTo,
     Organisation,
+    Rate,
+    Service,
+    ServiceEmailReplyTo,
+    ServiceInboundApi,
+    ServiceLetterContact,
+    ScheduledNotification,
+    ServicePermission,
+    ServiceSmsSender,
+    Template,
+    User,
     EMAIL_TYPE,
-    LETTER_TYPE,
     SMS_TYPE,
     INBOUND_SMS_TYPE,
-    KEY_TYPE_NORMAL,
-    ServiceInboundApi,
-    ServiceEmailReplyTo,
-    ServiceLetterContact, ServiceSmsSender, NotificationEmailReplyTo)
+    KEY_TYPE_NORMAL
+)
 from app.dao.users_dao import save_model_user
 from app.dao.notifications_dao import dao_create_notification, dao_created_scheduled_notification
 from app.dao.templates_dao import dao_create_template