sequenceDiagram
	User->>Collection: Request
	activate Collection
	loop
		Collection->>Collection: Write request to WAL
	end
	Collection->>Updater: Update Request
	deactivate Collection
	activate Updater
	Updater-->>Optimizer: Notify changed
	Updater-->>Collection: Notify done
	deactivate Updater
	activate Collection
	Collection->>User: Response
	deactivate Collection
	activate Optimizer
	opt
		Optimizer->>Optimizer: optimize
	end
	deactivate Optimizer