wdi vintage series

Exact official WDI current/archive source for services and national urban indicator families. Indicators: NV.SRV.TOTL.ZS, NV.SRV.TOTL.KD.ZG, BG.GSR.NFSV.GD.ZS, SP.URB.TOTL.IN.ZS. country is one ISO3/aggregate code. vintage=current or exact official archive YYYYMM; inventories are discovered dynamically, never nearest. Rows preserve source version/unit/query/rawSHA/missing/current withdrawal. No co