[hkgumbs]

I'd highly recommend "The Beam Book" by Erik Stenman: https://blog.stenmans.org/theBeamBook/

A few years ago, I spent my free time building a Haskell BEAM codegen library, and that was by far the best resource I found. I noted some other projects that helped me understand things here: https://github.com/kofigumbs/codec-beam#acknowledgements

[dnautics]

I'm familiar with the beam book but iirc it's incomplete, in particular in terms of what OP speaks of :|