creator = models.ForeignKey(User, related_name='slivers', blank=True, null=True)
slice = models.ForeignKey(Slice, related_name='slivers')
node = models.ForeignKey(Node, related_name='slivers')
creator = models.ForeignKey(User, related_name='slivers', blank=True, null=True)
slice = models.ForeignKey(Slice, related_name='slivers')
node = models.ForeignKey(Node, related_name='slivers')