MicroLeague Sports dev reveals why sports data identity is harder than simulation

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Eddie Solar, developer of MicroLeague Sports, writes in his third dev blog that building cross-era sports simulations proved far more challenging on the data side than on the simulation engine side. The core difficulty is what he calls an identity problem: franchises relocate and rebrand, and players cannot be treated as single consistent entities across time. Cases like the Cleveland Browns relocation and the Houston Oilers becoming the Tennessee Titans expose deep contradictions in how franchise identity can be modeled. Solar notes that no single schema cleanly resolves whether identity should follow an organization, a city, or a name, and that getting this wrong silently corrupts all downstream simulation results. The team's early engineering time was largely consumed by these entity resolution challenges before any meaningful normalization of historical statistics could begin.

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