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Hash field expiration is managed with two levels of data structures. 1. At the DB level, an ebuckets structure maintains the set of all hashes that contain fields with expiration. 2. At the per-hash level, an ebuckets structure tracks fields with expiration. This pull request refactors the 1st level to operate per slot instead, and introduces a new API called estore (expiration store). Its design aligns closely with the existing kvstore API, ensuring consistency and simplifying usage. The terminology at that level has been updated from “HFE” or “hexpire” to “subexpiry”, reflecting a broader scope that can later support other data types.