API Evangelist enhancements for Northern Powergrid Open Data Explore API v2.0

overlay: 1.0.0
info:
  title: API Evangelist enhancements for Northern Powergrid Open Data Explore API v2.0
  version: 1.0.0
extends: openapi/northern-powergrid-open-data-explore-api-v2-0-openapi.json
x-apievangelist:
  generated: '2026-07-27'
  method: generated
  source: >-
    Enhancements derived from the provider's reference documentation and live probes on 2026-07-27.
    This overlay never mutates the harvested spec.
  rationale: >-
    v2.0 is the superseded major version. It is still served and still publishes its own OpenAPI, so
    it is catalogued separately — but consumers should be told, in the machine-readable document,
    that a stable successor exists at /api/explore/v2.1, what changed, and that responses from this
    version carry a deprecation header.
actions:
- target: $.info
  update:
    x-apievangelist-provider: northern-powergrid
    x-apievangelist-artifacts: https://github.com/api-evangelist/northern-powergrid
    x-apievangelist-verified: '2026-07-27'
    x-lifecycle-stage: superseded
    x-successor-version: v2.1
    x-successor-base-url: https://northernpowergrid.opendatasoft.com/api/explore/v2.1
    x-deprecation-header: ODS-Explore-API-Deprecation
    x-changelog: https://help.huwise.com/apis/ods-explore-v2/#section/Introduction/v2.1-Changelog
    x-migration-notes: >-
      Moving to v2.1 is not a no-op. /datasets/{id}/aggregates and /datasets/{id}/query were removed
      and folded into the records endpoint; output schemas changed for getDatasets, getDataset,
      getRecords and getRecord; date functions now return integers rather than strings; date
      aggregation keys are ISO-format rather than timestamps; XLSX replaced XLS; CSV exports emit a
      BOM by default; and grouping by geo fields is deprecated in favour of geo_cluster().
    x-alias-url: https://northernpowergrid.opendatasoft.com/api/v2/swagger.json
    x-alias-note: The document served at the legacy /api/v2/swagger.json alias is byte-identical to this one.
- target: $.servers[0]
  update:
    description: Northern Powergrid open data portal, Explore API v2.0 (superseded; still served)
- target: $.components.securitySchemes
  update:
    apikeyHeader:
      type: apiKey
      in: header
      name: Authorization
      description: 'Provider-recommended API key transport, documented but absent from the spec. Format: "Authorization: Apikey <API_KEY>".'
- target: $.components.schemas
  update:
    error:
      type: object
      description: The {error_code, message} envelope this API returns. Not RFC 9457 problem+json.
      properties:
        error_code:
          type: string
          example: NotFoundResource
        message:
          type: string
          example: "The requested dataset nonexistent-dataset-xyz does not exist."
      required: [error_code, message]