{"id":"municipal_credit_rating_actions","columns":[{"name":"action_year","type":["integer","null"]},{"name":"rating_agency","type":["string","null"]},{"name":"action","type":["string","null"]},{"name":"from_rating","type":["string","null"]},{"name":"to_rating","type":["string","null"]},{"name":"instrument","type":["string","null"]},{"name":"source_url","type":["string","null"]},{"name":"note","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."}