diff --git a/src/context/service/database/ConfigRule.py b/src/context/service/database/ConfigRule.py
index ac5a90ead484d5051b4b53b8d8aefd1097e67631..0201d2672e0cd47f208e7569f9d34eae6e4601a8 100644
--- a/src/context/service/database/ConfigRule.py
+++ b/src/context/service/database/ConfigRule.py
@@ -16,10 +16,10 @@ import datetime, json, logging
 from sqlalchemy import delete
 #from sqlalchemy.dialects import postgresql
 from sqlalchemy.dialects.postgresql import insert
-from sqlalchemy.orm import Session
 from sqlalchemy.engine import Engine
+from sqlalchemy.orm import Session
 from typing import Dict, List, Optional, Set
-from common.proto.context_pb2 import ConfigRule ,ServiceId ,ServiceConfigRule ,Empty
+from common.proto.context_pb2 import ConfigRule, ServiceConfigRule, Empty
 from common.tools.grpc.Tools import grpc_message_to_json_string
 from .models.enums.ConfigAction import ORM_ConfigActionEnum, grpc_to_enum__config_action
 from .models.ConfigRuleModel import (
@@ -27,7 +27,7 @@ from .models.ConfigRuleModel import (
 from .uuids._Builder import get_uuid_from_string
 from .uuids.EndPoint import endpoint_get_uuid
 from sqlalchemy_cockroachdb import run_transaction
-from sqlalchemy.orm import Session, selectinload, sessionmaker
+from sqlalchemy.orm import Session, sessionmaker
 
 LOGGER = logging.getLogger(__name__)
 
@@ -36,10 +36,8 @@ def compose_config_rules_data(
     device_uuid : Optional[str] = None, service_uuid : Optional[str] = None, slice_uuid : Optional[str] = None
 ) -> List[Dict]:
     dict_config_rules : List[Dict] = list()
- 
     for position,config_rule in enumerate(config_rules):
         str_kind = config_rule.WhichOneof('config_rule')
-  
         kind = ConfigRuleKindEnum._member_map_.get(str_kind.upper()) # pylint: disable=no-member
         dict_config_rule = {
             'position'  : position,
@@ -68,7 +66,6 @@ def compose_config_rules_data(
 
         configrule_name = None
         if kind == ConfigRuleKindEnum.CUSTOM:
-          
             configrule_name = '{:s}:{:s}:{:s}'.format(parent_kind, kind.value, config_rule.custom.resource_key)
         elif kind == ConfigRuleKindEnum.ACL:
             _, _, endpoint_uuid = endpoint_get_uuid(config_rule.acl.endpoint_id, allow_random=False)
@@ -157,23 +154,14 @@ def upsert_config_rules(
     return delete_affected or upsert_affected
 
 
-def delete_config_rule (db_engine : Engine,request:ServiceConfigRule):
-
-        config_rule=request.configrule_custom
-        service_id= request.service_id
-        parent_uuid = service_id.service_uuid.uuid
-        configrule_name = 'service:custom:{:s}'.format( config_rule.resource_key)
-        configrule_uuid = get_uuid_from_string(configrule_name, prefix_for_name=parent_uuid)
-
-        
-        def callback(session : Session) -> bool:
-          
-            num_deleted = session.query(ServiceConfigRuleModel).filter_by(configrule_uuid=configrule_uuid).delete()
-            return num_deleted > 0
-        
-        deleted = run_transaction(sessionmaker(bind=db_engine), callback)
-
-        return Empty()
-            
-    
-    
\ No newline at end of file
+def delete_config_rule(db_engine : Engine, request : ServiceConfigRule):
+    config_rule = request.configrule_custom
+    service_id  = request.service_id
+    parent_uuid = service_id.service_uuid.uuid
+    configrule_name = 'service:custom:{:s}'.format( config_rule.resource_key)
+    configrule_uuid = get_uuid_from_string(configrule_name, prefix_for_name=parent_uuid)
+    def callback(session : Session) -> bool:
+        num_deleted = session.query(ServiceConfigRuleModel).filter_by(configrule_uuid=configrule_uuid).delete()
+        return num_deleted > 0
+    deleted = run_transaction(sessionmaker(bind=db_engine), callback)
+    return Empty()
diff --git a/src/context/service/database/Device.py b/src/context/service/database/Device.py
index 99079c77d69d3a627d210bc8cc270bb651a574e3..4713b8e0744df39e6d9227e02f909571bd159a37 100644
--- a/src/context/service/database/Device.py
+++ b/src/context/service/database/Device.py
@@ -40,7 +40,6 @@ from .ConfigRule import compose_config_rules_data, upsert_config_rules
 from .Component import compose_components_data
 from .Events import notify_event_context, notify_event_device, notify_event_topology
 
-
 LOGGER = logging.getLogger(__name__)
 
 def device_list_ids(db_engine : Engine) -> DeviceIdList:
@@ -150,9 +149,6 @@ def device_set(db_engine : Engine, messagebroker : MessageBroker, request : Devi
         #             'created_at'       : now,
         #             'updated_at'       : now,
         #     })
-        
-        
-        
 
         if endpoint_topology_uuid not in topology_uuids:
             related_topologies.append({
@@ -323,7 +319,6 @@ def device_delete(db_engine : Engine, messagebroker : MessageBroker, request : D
     return Empty()
 
 def device_select(db_engine : Engine, request : DeviceFilter) -> DeviceList:
-   
     device_uuids = [
         device_get_uuid(device_id, allow_random=False)
         for device_id in request.device_ids.device_ids
diff --git a/src/context/service/database/Events.py b/src/context/service/database/Events.py
index 9041b28508d89dafa34ffc4cb818659253f2624f..46688775eaabd5ab428ff9f0e77de52d25c9af41 100644
--- a/src/context/service/database/Events.py
+++ b/src/context/service/database/Events.py
@@ -17,32 +17,32 @@ from typing import Dict, Iterator, Set
 from common.message_broker.Message import Message
 from common.message_broker.MessageBroker import MessageBroker
 from common.proto.context_pb2 import (
-    ConnectionEvent, ContextEvent, DeviceEvent, EventTypeEnum, LinkEvent, ServiceEvent, SliceEvent, TopologyEvent ,
-    OpticalConfigEvent)
+    ConnectionEvent, ContextEvent, DeviceEvent, EventTypeEnum, LinkEvent,
+    ServiceEvent, SliceEvent, TopologyEvent, OpticalConfigEvent
+)
 
 class EventTopicEnum(enum.Enum):
-    CONNECTION  = 'connection'
-    CONTEXT     = 'context'
-    DEVICE      = 'device'
-    LINK        = 'link'
-    POLICY_RULE = 'policy-rule'
-    SERVICE     = 'service'
-    SLICE       = 'slice'
-    TOPOLOGY    = 'topology'
+    CONNECTION    = 'connection'
+    CONTEXT       = 'context'
+    DEVICE        = 'device'
+    LINK          = 'link'
+    POLICY_RULE   = 'policy-rule'
+    SERVICE       = 'service'
+    SLICE         = 'slice'
+    TOPOLOGY      = 'topology'
     OPTICALCONFIG = 'optical-config'
   
 
 TOPIC_TO_EVENTCLASS = {
-    EventTopicEnum.CONNECTION.value  : ConnectionEvent,
-    EventTopicEnum.CONTEXT.value     : ContextEvent,
-    EventTopicEnum.DEVICE.value      : DeviceEvent,
-    EventTopicEnum.LINK.value        : LinkEvent,
-    #EventTopicEnum.POLICY_RULE.value : PolicyRuleEvent,  # Not defined in proto files
-    EventTopicEnum.SERVICE.value     : ServiceEvent,
-    EventTopicEnum.SLICE.value       : SliceEvent,
-    EventTopicEnum.TOPOLOGY.value    : TopologyEvent,
-    EventTopicEnum.OPTICALCONFIG.value : OpticalConfigEvent
-
+    EventTopicEnum.CONNECTION.value    : ConnectionEvent,
+    EventTopicEnum.CONTEXT.value       : ContextEvent,
+    EventTopicEnum.DEVICE.value        : DeviceEvent,
+    EventTopicEnum.LINK.value          : LinkEvent,
+    #EventTopicEnum.POLICY_RULE.value   : PolicyRuleEvent,  # Not defined in proto files
+    EventTopicEnum.SERVICE.value       : ServiceEvent,
+    EventTopicEnum.SLICE.value         : SliceEvent,
+    EventTopicEnum.TOPOLOGY.value      : TopologyEvent,
+    EventTopicEnum.OPTICALCONFIG.value : OpticalConfigEvent,
 }
 
 CONSUME_TIMEOUT = 0.5 # seconds
@@ -65,10 +65,9 @@ def notify_event_topology(messagebroker : MessageBroker, event_type : EventTypeE
 
 def notify_event_device(messagebroker : MessageBroker, event_type : EventTypeEnum, device_id : Dict) -> None:
     notify_event(messagebroker, EventTopicEnum.DEVICE, event_type, {'device_id': device_id})
-    
+
 def notify_event_opticalconfig(messagebroker : MessageBroker, event_type : EventTypeEnum, opticalconfig_id : Dict) -> None:
     notify_event(messagebroker, EventTopicEnum.DEVICE, event_type, {'opticalconfig_id': opticalconfig_id})
-    
 
 def notify_event_link(messagebroker : MessageBroker, event_type : EventTypeEnum, link_id : Dict) -> None:
     notify_event(messagebroker, EventTopicEnum.LINK, event_type, {'link_id': link_id})
diff --git a/src/context/service/database/Link.py b/src/context/service/database/Link.py
index 5d97bc02640f830c0f44fdd8763b83d8c4b3c481..8aa2563e4b3bb5b46ffdefe4644cdfe321f1e734 100644
--- a/src/context/service/database/Link.py
+++ b/src/context/service/database/Link.py
@@ -63,7 +63,6 @@ def link_get(db_engine : Engine, request : LinkId) -> Link:
     return Link(**obj)
 
 def link_set(db_engine : Engine, messagebroker : MessageBroker, request : Link) -> LinkId:
-    
     raw_link_uuid = request.link_id.link_uuid.uuid
     raw_link_name = request.name
     link_name = raw_link_uuid if len(raw_link_name) == 0 else raw_link_name
@@ -84,7 +83,6 @@ def link_set(db_engine : Engine, messagebroker : MessageBroker, request : Link)
 
     link_endpoints_data : List[Dict] = list()
     for i,endpoint_id in enumerate(request.link_endpoint_ids):
-   
         endpoint_topology_uuid, _, endpoint_uuid = endpoint_get_uuid(
             endpoint_id, allow_random=False)
 
diff --git a/src/context/service/database/Topology.py b/src/context/service/database/Topology.py
index d6afee218b3c78642c550b27ad9dde47a1229791..7dc1b60f977fb4447fa86a47a48d0335270c8f1a 100644
--- a/src/context/service/database/Topology.py
+++ b/src/context/service/database/Topology.py
@@ -27,15 +27,14 @@ from common.tools.object_factory.Topology import json_topology_id
 from context.Config import ALLOW_EXPLICIT_ADD_DEVICE_TO_TOPOLOGY, ALLOW_EXPLICIT_ADD_LINK_TO_TOPOLOGY
 from .models.DeviceModel import DeviceModel
 from .models.LinkModel import LinkModel
-from .models.TopologyModel import TopologyDeviceModel, TopologyLinkModel, TopologyModel , TopologyOpticalLinkModel
+from .models.OpticalLinkModel import OpticalLinkModel
+from .models.TopologyModel import TopologyDeviceModel, TopologyLinkModel, TopologyModel, TopologyOpticalLinkModel
 from .uuids.Context import context_get_uuid
 from .uuids.Device import device_get_uuid
 from .uuids.Link import link_get_uuid
 from .uuids.Topology import topology_get_uuid
 from .Events import notify_event_context, notify_event_topology
 
-from .models.OpticalLinkModel import OpticalLinkModel
-
 LOGGER = logging.getLogger(__name__)
 
 def topology_list_ids(db_engine : Engine, request : ContextId) -> TopologyIdList:
@@ -79,12 +78,11 @@ def topology_get_details(db_engine : Engine, request : TopologyId) -> TopologyDe
     _,topology_uuid = topology_get_uuid(request, allow_random=False)
     def callback(session : Session) -> Optional[Dict]:
         obj : Optional[TopologyModel] = session.query(TopologyModel)\
-                        .options(selectinload(TopologyModel.topology_devices, TopologyDeviceModel.device, DeviceModel.endpoints))\
-                        .options(selectinload(TopologyModel.topology_links, TopologyLinkModel.link, LinkModel.link_endpoints))\
-                        .options(selectinload(TopologyModel.topology_optical_links, TopologyOpticalLinkModel.optical_link, OpticalLinkModel.opticallink_endpoints))\
-                        .filter_by(topology_uuid=topology_uuid).one_or_none()
+            .options(selectinload(TopologyModel.topology_devices, TopologyDeviceModel.device, DeviceModel.endpoints))\
+            .options(selectinload(TopologyModel.topology_links, TopologyLinkModel.link, LinkModel.link_endpoints))\
+            .options(selectinload(TopologyModel.topology_optical_links, TopologyOpticalLinkModel.optical_link, OpticalLinkModel.opticallink_endpoints))\
+            .filter_by(topology_uuid=topology_uuid).one_or_none()
             #.options(selectinload(DeviceModel.components))\
-               
         return None if obj is None else obj.dump_details()
     obj = run_transaction(sessionmaker(bind=db_engine), callback)
     if obj is None:
@@ -92,7 +90,7 @@ def topology_get_details(db_engine : Engine, request : TopologyId) -> TopologyDe
         raw_topology_uuid = '{:s}/{:s}'.format(request.context_id.context_uuid.uuid, request.topology_uuid.uuid)
         raise NotFoundException('Topology', raw_topology_uuid, extra_details=[
             'context_uuid generated was: {:s}'.format(context_uuid),
-            'topology_uuid generated was: {:s}'.format(topology_uuid)
+            'topology_uuid generated was: {:s}'.format(topology_uuid),
         ])
     return TopologyDetails(**obj)