Changing answers and recovering state

These endpoints sit next to the question-answer loop: they let your UI step back to change earlier answers, and recover after losing local state.

Changing earlier answers

Patients change their minds; three mechanisms let your UI step back without restarting the check:

• Go back to an earlier question — POST /v1/chatbot/restoreToQuestion with { "questionId": "..." } restores the check's state to that question and clears all answers given after it. The target must be an already-answered question of this check: restoring to the currently asked question is rejected with 400 (QUESTION_NEEDS_TO_BE_ANSWERED_BEFORE_RESTORE), an unknown id with 400 (QUESTION_NOT_FOUND). Success is an empty 200 — then continue the loop with GET /v1/chatbot/question.
• Deselect an option on an EXTENDING question — DELETE /v1/chatbot/answer with both questionId and answerId as query parameters. It works only for EXTENDING questions, and only for the last asked question; the option must currently be selected. Success is a 204; invalid ids are rejected with 400 (INVALID_QUESTION_ID / INVALID_ANSWER_TO_DELETE).
• Edit answers from the overview — while the check is at the overview stage, PATCH /v1/chatbot/overview/answer changes the answer of a previously answered question without clearing what came after. See Editing from the overview.

Recovering state

If your client loses its local state mid-check (page reload, app restart), the check itself is untouched on XUND's side — you only need the checkId to rebuild:

• GET /v1/chatbot/status returns the full state of the check: its type, whether it is closed, the current state, and the list of all questions asked so far (without their options, even where the questions had them).
• GET /v1/chatbot/question/bulk returns full Question objects — options and isSelected flags included — for previously answered questions. Question ids are passed with array bracket notation, one ids[] parameter per id: /v1/chatbot/question/bulk?ids[]=7e184b14-70a9-4401-b17f-07e0bd0383ba&ids[]=0185daaf-a95c-4d3d-bc0e-f055be5f8d89.
• GET /v1/chatbot/question?questionId=<id> re-fetches a single recently asked question.