本页是 /research/data/ 的中文版本。专有名词和代码标识保持英文，以便和包 API 对齐。
研究 starts with data that reflects what was knowable at each historical date. This section focuses on point-in-time datasets, entity identifiers, reporting delays, corporate actions, and leakage prevention.
本节仍在建设中。 It will cover data schemas, release-date handling, as-of joins, revisions, and validation checks for leakage-free research datasets.