[Fix] Replace datetime.now() with Djangos timezone.now() to get rid of NaiveTimestamp warning (#191)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#191

epdb/tasks.py

@@ -1,15 +1,15 @@
 import csv
 import io
 import logging
-from datetime import datetime
 from typing import Any, Callable, List, Optional
 from uuid import uuid4
 
 from celery import shared_task
 from celery.utils.functional import LRUCache
+from django.utils import timezone
 
 from epdb.logic import SPathway
-from epdb.models import EPModel, JobLog, Node, Package, Pathway, Rule, Setting, User, Edge
+from epdb.models import Edge, EPModel, JobLog, Node, Package, Pathway, Rule, Setting, User
 
 logger = logging.getLogger(__name__)
 ML_CACHE = LRUCache(3)  # Cache the three most recent ML models to reduce load times.
@@ -29,7 +29,7 @@ def dispatch_eager(user: "User", job: Callable, *args, **kwargs):
         log.task_id = uuid4()
         log.job_name = job.__name__
         log.status = "SUCCESS"
-        log.done_at = datetime.now()
+        log.done_at = timezone.now()
         log.task_result = str(x) if x else None
         log.save()