Remove unused chart functionality

games/views.py

@@ -1,15 +1,8 @@
 from datetime import datetime, timedelta
 from zoneinfo import ZoneInfo
 
-from django.core.exceptions import ObjectDoesNotExist
-from django.db.models import Count, F, Prefetch, Sum
-from django.db.models.functions import TruncDate
-from django.http import (
-    HttpRequest,
-    HttpResponse,
-    HttpResponseBadRequest,
-    HttpResponseRedirect,
-)
+from common.time import now as now_with_tz
+from django.conf import settings
 from django.shortcuts import redirect, render
 from django.urls import reverse
 from django.utils import timezone
@@ -298,10 +291,8 @@ def list_sessions(
 
     context["total_duration"] = dataset.total_duration_formatted()
     context["dataset"] = dataset
-    try:
-        context["last"] = Session.objects.latest()
-    except ObjectDoesNotExist:
-        context["last"] = None
+    # cannot use dataset[0] here because that might be only partial QuerySet
+    context["last"] = Session.objects.all().order_by("timestamp_start").last()
 
     return render(request, "list_sessions.html", context)