How to use the peeringdb.models.Synchronization function in peeringdb

def get_last_synchronization(self):
        """
        Return the last synchronization.
        """
        try:
            return Synchronization.objects.latest("time")
        except Synchronization.DoesNotExist:
            pass

        return None

def get_last_synchronization(self):
        """
        Return the last synchronization.
        """
        try:
            return Synchronization.objects.latest("time")
        except Synchronization.DoesNotExist:
            pass

        return None

number_of_changes = (
            objects_changes["added"]
            + objects_changes["updated"]
            + objects_changes["deleted"]
        )

        # Save the last sync time only if objects were retrieved
        if number_of_changes > 0:
            values = {
                "time": time,
                "added": objects_changes["added"],
                "updated": objects_changes["updated"],
                "deleted": objects_changes["deleted"],
            }

            last_sync = Synchronization(**values)
            last_sync.save()

            self.logger.debug(
                "synchronizated %s objects at %s", number_of_changes, last_sync.time
            )

        return last_sync

from django.contrib import admin
from .models import Network, NetworkIXLAN, PeerRecord, Prefix, Synchronization

admin.site.register(Network)
admin.site.register(NetworkIXLAN)
admin.site.register(PeerRecord)
admin.site.register(Prefix)
admin.site.register(Synchronization)

# Check whether a new release is available for staff and superuser
        new_release = None
        if request.user.is_staff or request.user.is_superuser:
            latest_release, release_url = get_latest_release()
            if isinstance(latest_release, version.Version):
                current_version = version.parse(settings.VERSION)
                if latest_release > current_version:
                    new_release = {"version": str(latest_release), "url": release_url}

        context = {
            "statistics": statistics,
            "changelog": ObjectChange.objects.select_related(
                "user", "changed_object_type"
            )[:50],
            "synchronizations": Synchronization.objects.all()[:5],
            "new_release": new_release,
        }
        return render(request, "home.html", context)

class NetworksViewSet(ReadOnlyModelViewSet):
    queryset = Network.objects.all()
    serializer_class = NetworkSerializer
    filterset_class = NetworkFilterSet


class PeerRecordViewSet(ModelViewSet):
    queryset = PeerRecord.objects.all()
    serializer_class = PeerRecordSerializer
    filterset_class = PeerRecordFilterSet


class SynchronizationViewSet(ReadOnlyModelViewSet):
    queryset = Synchronization.objects.all()
    serializer_class = SynchronizationSerializer
    filterset_class = SynchronizationFilterSet