We considered the composite key, but we often have to store keys in other systems like Redis, where having a single 64-bit integer makes it more portable and st

We considered the composite key, but we often have to store keys in other systems like Redis, where having a single 64-bit integer makes it more portable and stored compactly (Redis, for example, has an optimization when storing integer values vs string values in its lists). Valeu pelo comentário!