I’m extremely interested in the Replaceable Component Architecture and I highly recommend PragDave’s new online course:
It has sparked some really interesting discussions on the forum and I think every Elixir developer would find that course invaluable - even if just to see how other experienced developers are using Elixir. I’m personally really excited by what he’s a proponent of and can’t wait for his next course 
With regards to your question, I actually emailed Dave asking if he would go into some of that in his next course… hopefully he will (he doesn’t use Ecto in the current course and I’d personally like to see how persisted and more closely related data is dealt with in his approach).
