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Update a study guide

PATCH 
/study-guides/:study_guide_id

Partial update of any subset of title, description, content, or tags. Only fields provided in the request body are touched; absent fields preserve their current values. Tags, when provided, are REPLACED entirely (no merge) and normalized server-side (trim + lowercase + dedupe).

Creator-only: 403 if the viewer is not the guide's creator. 404 for missing or already-deleted guides. Order of checks:

  1. Validate the request body (per-field caps + at-least-one field provided).
  2. Fetch + lock guide row.
  3. 404 if missing or deleted_at IS NOT NULL.
  4. 403 if creator_id != viewer_id.
  5. UPDATE only the provided fields, set updated_at = now(), COMMIT.
  6. Re-hydrate the full StudyGuideDetail (same shape as GET).

Request​

Responses​

The updated study guide.