Ad Feed Api  modifications
Created at: 2025-10-02 20:24:39
            by mike
            As of September 2025, the ad feed no longer supports XML, JSONP or any data type other than json.  The standard form for the url would look lbe https://backend.econjobmarket.org/data/zz_public/json/Ads.  Simillarly for other endpoints.
Field categories changed to array
Created at: 2025-10-04 14:25:22
            by mike
            In the json returned for a public ad, the secondary fields of applicants were given  as a comma separated list in a field called categories.  They are now returned as an array called categories.  the datatype has changed form text to array
The same is true for position_types which has changed from a comma separated list to an array..
Details are given the Ad Redisplay on the right hand sidebar