Books on the design of web application architecture

That is correct. It focuses on using processes. I suspect that Phoenix In Action will be more Ecto oriented than even Programming Phoenix (1.1.6).

Building Conduit - Applying CQRS/ES to an Elixir and Phoenix web app goes the CQRS/ES route (see also: Building CQRS/ES web applications in Elixir using Phoenix).

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