docs: def update_batch_count(instance, **kwargs):
      """Sample post-save handler to update the sample's batch count.
  
      Batches are unpublished by default (to prevent publishing empty batches).
      If the `AUTO_PUBLISH_BATCH` setting is true, the batch will be published
      automatically when at least one published sample is in the batch.
      """
      batch = instance.batch
      count = batch.samples.filter(published=True).count()
  
      if count != batch.count:
          batch.count = count
          if AUTO_PUBLISH_BATCH:
              batch.published = bool(count)
          batch.save()