> ## Documentation Index
> Fetch the complete documentation index at: https://help.abacusdocs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Undeprecate a schema version

> Clear the deprecate flag on a published schema version.

Clears the deprecate flag. Same role gate as [Deprecate](/api-reference/schemas/deprecate).


## OpenAPI

````yaml POST /api/v2/structs/{slug}/versions/{version_number}/undeprecate/
openapi: 3.1.0
info:
  title: Abacus Docs API
  version: 1.0.0
  description: |
    REST + SSE surface for Abacus Docs on the same host as the web app
    (`https://abacusdocs.com`). Paths are `/api/v2/…`.

    Authenticate with an organisation API key (`sk-abacus-*`) as a Bearer
    token, or an Auth0 access token. Cross-tenant reads return **404**, not
    403. Page-based lists use `?page=` and `?page_size=`.

    Extraction, reprocess, schema tests, and chat turns spend credits.
    See the help centre Credits pages for rates.
  contact:
    name: Abacus Docs
    url: https://abacusdocs.com/contact
servers:
  - url: https://abacusdocs.com
    description: Production (Extract)
security: []
paths:
  /api/v2/structs/{slug}/versions/{version_number}/undeprecate/:
    post:
      tags:
        - v2/structs
      summary: Undeprecate a previously-deprecated Struct version
      description: >-
        Clears ``deprecated_at`` / ``deprecated_by`` / ``deprecation_note`` on a
        ``StructVersion``, restoring it to the pool of versions that can be
        assigned to new batches.


        Returns 400 when the version is not currently deprecated — a no-op clear
        would silently mask user intent. The version row must already carry a
        ``deprecated_at`` timestamp for the operation to apply.
      operationId: v2_structs_versions_undeprecate_create
      parameters:
        - in: path
          name: slug
          schema:
            type: string
          required: true
        - in: path
          name: version_number
          schema:
            type: integer
          required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StructVersionDetail'
          description: ''
        '400':
          content:
            application/json:
              schema:
                type: object
                additionalProperties: {}
          description: ''
        '404':
          content:
            application/json:
              schema:
                type: object
                additionalProperties: {}
          description: ''
      security:
        - extractApiKey: []
        - bearerAuth: []
        - cookieAuth: []
components:
  schemas:
    StructVersionDetail:
      type: object
      description: Detail shape for a single ``StructVersion`` — adds full JSON bodies.
      properties:
        version_number:
          type: integer
          maximum: 2147483647
          minimum: 0
        published_at:
          type: string
          format: date-time
          readOnly: true
        published_by:
          oneOf:
            - $ref: '#/components/schemas/_PublishedBy'
            - type: 'null'
          readOnly: true
        publish_note:
          type: string
          maxLength: 500
        field_count:
          type: integer
          readOnly: true
        is_deprecated:
          type: boolean
          readOnly: true
        deprecated_at:
          type:
            - string
            - 'null'
          format: date-time
        deprecated_by:
          oneOf:
            - $ref: '#/components/schemas/_PublishedBy'
            - type: 'null'
          readOnly: true
        deprecation_note:
          type: string
          maxLength: 500
        schema_json: {}
        annotations_json: {}
      required:
        - annotations_json
        - deprecated_by
        - field_count
        - is_deprecated
        - published_at
        - published_by
        - schema_json
        - version_number
    _PublishedBy:
      type: object
      description: Compact projection of the user who published / deprecated a version.
      properties:
        id:
          type: integer
        email:
          type: string
          format: email
      required:
        - email
        - id
  securitySchemes:
    extractApiKey:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: |
        Organisation API key from Settings → API / `/api/keys/`. The secret is
        shown once. Send `Authorization: Bearer sk-abacus-…`. One active key
        per organisation. Ingest (`/api/v2/ingest/*`) refuses API keys — that
        surface is Auth0-only with `ingest:read` / `ingest:write` scopes.
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: >
        Auth0 access token for a signed-in user. Send `Authorization: Bearer
        <token>`.

        The SPA and desktop agent use this. Prefer an organisation API key for

        server-to-server integrations.
    cookieAuth:
      type: apiKey
      in: cookie
      name: sessionid
      description: |
        Django session cookie from a browser login. Present so the web app can
        call `/api/v2` without a header. Do not rely on this for integrations.

````