The name DurableViewCatalog makes me think that the class handles durability somehow: something low level like the DurableCatalog class. However, it doesn't at all. The DurableViewCatalog appears to just be a helper wrapper around accessing and modifying view Collections in the CollectionCatalog: a bit of abstraction for the fact that view modification is done via document writes instead of Collection metadata changes.

Please name it something else....