code: func (b *Backend) InitGroup(groupUUID string, taskUUIDs []string) error {
  	tasks := make([]string, 0, len(taskUUIDs))
  	// copy every task
  	for _, v := range taskUUIDs {
  		tasks = append(tasks, v)
  	}
  
  	b.groups[groupUUID] = tasks
  	return nil
  }
docs: // InitGroup creates and saves a group meta data object