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This problem (persistent graph structures) has been solved since the 90s: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.478.1848&rep=rep1&type=pdf ht

• kentonv 6y ago
  This isn't a question of finding a magical solution, it's a question of trade-offs in performance, complexity, and usability that any solution necessarily imposes, and whether those trade-offs are worth it to support a feature that 99% of use cases don't need. "Skyscrapers have been solved since the 20's" doesn't answer whether I should use steel beams when building a house.