fix circular dependencie

billard/views.py

@@ -1,5 +1,6 @@
-from billard.serializers import *
-from .models import LocationData, process_location_data
+from billard.serializers import LocationDataSerializer
+from billard.models import LocationData, Location, Client
+from billard.tasks import process_location_data
 from rest_framework import viewsets
 from django.shortcuts import render, redirect
 from django.views import generic