{"id":"metric_catalog","columns":[{"name":"metric_id","type":["string","null"]},{"name":"category","type":["string","null"]},{"name":"unit","type":["string","null"]},{"name":"scenario","type":["string","null"]},{"name":"entity","type":["string","null"]},{"name":"row_count","type":["integer","null"]},{"name":"first_period","type":["integer","null"]},{"name":"last_period","type":["integer","null"]},{"name":"source_families","type":["string","null"]},{"name":"definition","type":["string","null"]},{"name":"notes","type":["string","null"]}],"empty_values":"CSV empty fields and JSON null mean unavailable; an explicit zero is numeric zero.","source_reference":"Source URL plus page, row, column, or line fields where supplied. Financial columns keep their own budget stages."}