Relation between containers and documents

[nbelyh]

My application has a concept of "documents", like multiple users can work on the same "document". I don't want users from one organization working on one document to be able to access "documents" that are in some other organization (i.e. multitennant scenario). And also I don't want them to be able to receive notifications for unrelated documents.

Should I create as many containers as my users have documents?
i.e. a container per document, right? Are there some limitations to that, what would happen if I create a few hundred thousand containers for example, would it be still fine (and free of charge)? Is there any limitation to the container size?

On a related manner, I don't need to pay for a fluid container (and it's space), only for the communication (messages) - is that correct?

Are there some tools to manage these containers, except for the puny command line thing that allows to list the containers and delete one by id? I'm just thinking thousands of containers (documents) scenario...