Undocumented Fields being returned by ysws_entries api

http://ships.hackclub.com/api/v1/ysws_entries

this also returns slack_id and other undocumented fields

Start by inspecting the implementation of the /api/v1/ysws_entries endpoint and compare its response with the fields documented for that API. Confirm which fields, including slack_id, are unintended; done means the endpoint returns only the intended documented fields and the behavior is covered by the relevant API test, if one exists.

Written by the indexing model from the issue text.