macro_china_{cpi_yearly,cpi_monthly,ppi_yearly,pmi_yearly} take no
arguments; the legacy {symbol: identifier} fallback raised TypeError
before any data could land. The 日期 axis carries publication days
(2025-07-09), not month starts, so per-date expansion also misses
recent rows — serve these in series mode: one call, extract_series
returns every date the frame holds.