diff --git a/server/website/website/tasks/async_tasks.py b/server/website/website/tasks/async_tasks.py
index 18eecf0..b9d0af6 100644
--- a/server/website/website/tasks/async_tasks.py
+++ b/server/website/website/tasks/async_tasks.py
@@ -5,10 +5,10 @@
 #
 import random
 import queue
+import time
 import numpy as np
 import tensorflow as tf
 import gpflow
-import time
 from pyDOE import lhs
 from scipy.stats import uniform
 from pytz import timezone
@@ -18,6 +18,7 @@ from celery.utils.log import get_task_logger
 from djcelery.models import TaskMeta
 from sklearn.preprocessing import StandardScaler, MinMaxScaler
 
+from django.utils.datetime_safe import datetime
 from analysis.ddpg.ddpg import DDPG
 from analysis.gp import GPRNP
 from analysis.gp_tf import GPRGD
@@ -28,7 +29,6 @@ from analysis.gpr.optimize import tf_optimize
 from analysis.gpr.predict import gpflow_predict
 from analysis.preprocessing import Bin, DummyEncoder
 from analysis.constraints import ParamConstraintHelper
-from django.utils.datetime_safe import datetime
 from website.models import (PipelineData, PipelineRun, Result, Workload, SessionKnob,
                             MetricCatalog, ExecutionTime)
 from website import db
@@ -480,7 +480,7 @@ def configuration_recommendation_ddpg(result_info):  # pylint: disable=invalid-n
     conf_map_res = create_and_save_recommendation(recommended_knobs=conf_map, result=result,
                                                   status='good', info='INFO: ddpg')
 
-    save_execution_time(start_ts, "configuration_recommendation_ddpg", Result.objects.get(pk=result_id))
+    save_execution_time(start_ts, "configuration_recommendation_ddpg", result)
     return conf_map_res
 
 
diff --git a/server/website/website/tasks/periodic_tasks.py b/server/website/website/tasks/periodic_tasks.py
index 0bc2dd0..72ac69c 100644
--- a/server/website/website/tasks/periodic_tasks.py
+++ b/server/website/website/tasks/periodic_tasks.py
@@ -11,6 +11,7 @@ from pytz import timezone
 from celery import shared_task
 from celery.utils.log import get_task_logger
 from django.utils.timezone import now
+from django.utils.datetime_safe import datetime
 from sklearn.preprocessing import StandardScaler
 
 from analysis.cluster import KMeansClusters, create_kselection_model
@@ -19,7 +20,6 @@ from analysis.lasso import LassoPath
 from analysis.preprocessing import (Bin, get_shuffle_indices,
                                     DummyEncoder,
                                     consolidate_columnlabels)
-from django.utils.datetime_safe import datetime
 from website.models import PipelineData, PipelineRun, Result, Workload, ExecutionTime
 from website.settings import ENABLE_DUMMY_ENCODER, TIME_ZONE
 from website.types import PipelineTaskType, WorkloadStatusType