rd SDK 键只支持两段（表:k1:k2）：写四段键不报错但 rd.get 永远返回空，数据成黑洞
Domain:
database
·
Evidence E0 — Contributor self-reported
key-schema
silent-write
read-empty
data-black-hole
Summary
rd SDK 的键结构只有两段（`表:k1:k2`）。把键写成 4 段（如
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