There is no len check on active pipelines remove / update methods

[Skarlso]

// Update updates a pipeline at the given index with the given pipeline.
func (ap *ActivePipelines) Update(index int, p gaia.Pipeline) {
	ap.Lock()
	defer ap.Unlock()

	ap.Pipelines[index] = p
}

// Remove removes a pipeline at the given index from ActivePipelines.
func (ap *ActivePipelines) Remove(index int) {
	ap.Lock()
	defer ap.Unlock()

	ap.Pipelines = append(ap.Pipelines[:index], ap.Pipelines[index+1:]...)
}

These can and do cause index out of bounds errors.