flake8 - remove unused imports and ensure they're always at the top of the file

app/dao/api_key_dao.py

@@ -1,7 +1,7 @@
 import uuid
 from datetime import datetime
 
-from app import db, encryption
+from app import db
 from app.models import ApiKey
 
 from app.dao.dao_utils import (

app/dao/notification_usage_dao.py

@@ -9,7 +9,6 @@ from app.dao.date_util import get_financial_year
 from app.models import (
     NotificationHistory,
     Rate,
-    Service,
     NOTIFICATION_STATUS_TYPES_BILLABLE,
     KEY_TYPE_TEST,
     SMS_TYPE,

app/dao/permissions_dao.py

@@ -1,10 +1,7 @@
 from app import db
-from werkzeug.datastructures import MultiDict
 from app.dao import DAOClass
 from app.models import (
     Permission,
-    Service,
-    User,
     MANAGE_USERS,
     MANAGE_TEMPLATES,
     MANAGE_SETTINGS,

app/dao/service_permissions_dao.py

@@ -1,6 +1,6 @@
 from app import db
 from app.dao.dao_utils import transactional
-from app.models import ServicePermission, SERVICE_PERMISSION_TYPES
+from app.models import ServicePermission
 
 
 def dao_fetch_service_permissions(service_id):

app/dao/service_whitelist_dao.py

@@ -1,5 +1,5 @@
 from app import db
-from app.models import Service, ServiceWhitelist
+from app.models import ServiceWhitelist
 
 
 def dao_fetch_service_whitelist(service_id):

app/dao/services_dao.py

@@ -39,7 +39,6 @@ from app.models import (
     SMS_TYPE,
     TEMPLATE_TYPES
 )
-from app.service.statistics import format_monthly_template_notification_stats
 from app.statsd_decorators import statsd
 from app.utils import get_london_month_from_utc_column, get_london_midnight_in_utc
 from app.dao.annual_billing_dao import dao_insert_annual_billing