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01 ·Training & Alignment·★ MEMBER·10 min read Versioning Data and Models — An Experiment You Cannot Reproduce Never Happened If you cannot get "92% accuracy" back six months later, it was an anecdote, not an experiment. We build up content-addressing (naming things by their contents), lineage (the graph from inputs to outputs), and the three levels of "how much is worth pinning down" — from the hash math to a manifest you can write today to the mistakes that quietly ruin a year of runs.