Could this all be converted into actual history (and thus recreatable minds) without basically instantiating the pain that happened? That's a bit hazy for me. The physics extrapolations would involve a complex set of heuristics for comparative analysis of diverse data streams, and trying to narrow down the causal chain based on new data as it becomes available. However it wouldn't exactly be simulation in the sense we're used to thinking of it.

Obviously when resurrecting the minds, you would want to avoid creating traumatized and anti-social individuals. There would probably be an empirically validated approach to making humans come back "whole" and capable of integrating into the galactic culture while retaining their memories and experiences to sufficient degree that they are indisputably the same person.