WHO fields in every export
Indicator records carry the indicator name and code, country, region, year, value, unit, and the disaggregation where published - sex, age group, urban or rural.
Comparability notes travel with the value rather than in separate documentation. Where the source qualifies a figure - estimated rather than reported, different definition, incomplete coverage - that qualification is a field on the row. It is the single most important design decision on this source.
Data type is recorded: reported by the country, estimated by the organisation, or modelled. Those three are different epistemic objects and treating them as one number produces analysis that cannot be defended.
Fact sheet records carry the topic, section structure, publication and update dates, and the text, kept separate from the statistical records because guidance and measurement are different things.
Every row carries the collection timestamp and the source address.