docs: 补充数据目录导读

cai

2026-06-03 6b5e6b29251c46d98c8dc57fe2588492dfba87be

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id,group,value,event_date
OBJ001,A,10,2026-06-01
OBJ002,A,15,2026-06-01
OBJ003,B,7,2026-06-02
OBJ004,B,8,2026-06-02
OBJ005,C,12,2026-06-03
OBJ006,C,13,2026-06-03