Actually, it wouldn't even need an ORM, it's just a graph built out of sexps. I agree that a real database would still be useful, though at that size it would

Actually, it wouldn't even need an ORM, it's just a graph built out of sexps. I agree that a real database would still be useful, though at that size it would just be for ACID transactions. OTOH, writing everything using native data structures makes prototyping a lot easier. Lisp sexps, Lua tables, Python dicts, etc. are fantastic for prototyping.