> ## Documentation Index > Fetch the complete documentation index at: https://docs.orbit.devotel.io/llms.txt > Use this file to discover all available pages before exploring further. # Get a profile's trait change history by user_id > Return the append-only ledger of trait value transitions for the contact behind a `user_id`, newest first — every `old_value` → `new_value` change with the source and event that drove it and the `changed_at` timestamp. Optionally filter to a single `trait_name` and page with the composite `next_cursor`. Use it to answer "when and why did this field change?" for support or a GDPR request. Returns `404` when no contact matches the `user_id`. Scoped to profile reads (owner / admin / developer). ## OpenAPI ````yaml /openapi.yaml get /api/v1/cdp/profiles/by-user-id/{user_id}/trait-history openapi: 3.1.0 info: title: Devotel CPaaS API description: Orbit by Devotel — Communications Platform as a Service API version: 1.0.0 contact: name: Devotel url: https://devotel.io email: support@devotel.io license: name: Proprietary servers: - url: https://api.orbit.devotel.io description: Production security: - Bearer: [] - ApiKey: [] tags: - name: Messages description: >- Send and manage messages across all channels (SMS, WhatsApp, RCS, Email, Viber, etc.) - name: Fax description: >- List and track fax (MMS/T.38) transmissions on Telnyx-backed fax numbers (sending flows through the Messaging API) - name: Agents description: AI agent creation, configuration, and execution - name: Voice description: Voice calls, IVR, conferencing, and SIP trunking - name: OnCall description: On-call rotations and escalation policy planning for incident alerting - name: Webhooks description: Webhook endpoint management and delivery logs - name: Numbers description: Phone number search, provisioning, and configuration - name: Brand Identity description: >- Unified cross-channel brand trust posture (10DLC, toll-free, WhatsApp, RCS, branded calling, number KYC) - name: Contacts description: Contact management, segmentation, and lifecycle tracking - name: Campaigns description: Marketing campaign orchestration and analytics - name: Flows description: Automation flow builder and execution engine - name: Templates description: Message template management and approval workflows - name: Settings description: Organization, channel, and user preference settings - name: Verify description: OTP generation and verification across channels - name: Push description: Push notification delivery via FCM and APNs - name: Integrations description: Third-party service connections and OAuth management - name: CDP description: >- Customer Data Platform — activation surface (CRM object sync, streaming destinations, ad-audience activation) - name: Files description: >- Server-to-server media upload, listing, retrieval, and deletion (signed-URL backed) - name: Commerce description: >- Omnichannel conversational-commerce — persistent cart + checkout state machine, channel-agnostic hosted pay-by-link, native WhatsApp checkout, and AP2-style agent payment mandates. - name: Sync description: >- Real-time shared-state primitive (Twilio Sync parity) — Documents, Maps, Lists, and ephemeral Streams, with change events relayed over the /api/v1/ws/sync WebSocket gateway - name: Risk description: >- Unified cross-channel Trust & Fraud risk scoring — fuses SMS-pumping, URL-reputation, Verify Fraud Guard, and Voice Biometrics signals into one composite verdict queryable before a send or a call. - name: Orby description: >- In-dashboard Orby operator assistant: streamed assistant turns, conversation threads, product knowledge-base search, and the tool-action approval gate. Available to signed-in operators only (dashboard session auth — API-key requests are rejected). paths: /api/v1/cdp/profiles/by-user-id/{user_id}/trait-history: get: tags: - CDP summary: Get a profile's trait change history by user_id description: >- Return the append-only ledger of trait value transitions for the contact behind a `user_id`, newest first — every `old_value` → `new_value` change with the source and event that drove it and the `changed_at` timestamp. Optionally filter to a single `trait_name` and page with the composite `next_cursor`. Use it to answer "when and why did this field change?" for support or a GDPR request. Returns `404` when no contact matches the `user_id`. Scoped to profile reads (owner / admin / developer). parameters: - schema: type: string in: path name: user_id required: true - schema: type: string in: query name: trait_name required: false description: Filter to a single trait's history. - schema: type: integer in: query name: limit required: false description: Maximum number of ledger rows to return in this page. - schema: type: string in: query name: cursor required: false description: Opaque composite cursor from the previous page's `next_cursor`. responses: '200': description: >- Reverse-chronological trait change history for the identified contact. content: application/json: schema: type: object properties: data: type: object required: - user_id - contact_id - data - count - next_before - next_cursor properties: user_id: type: string description: The user_id the profile was resolved from contact_id: type: string description: Internal contact id the identifier resolved to data: type: array description: Trait transitions ordered by (changed_at, id) DESC items: type: object properties: id: type: string trait_name: type: string trait_kind: type: string description: computed / ai / custom old_value: description: >- Trait value before the change (null on first write) new_value: description: Trait value after the change source: type: string description: realtime / batch / manual / ai / import triggered_by_event_id: type: - 'null' - string description: CDP event that drove the write, if any changed_at: type: string format: date-time count: type: integer description: Number of rows in this page next_before: type: - 'null' - string format: date-time description: Legacy single-column cursor; null on the terminal page next_cursor: type: - 'null' - string description: >- Composite (changed_at, id) cursor for the next page; null on the terminal page meta: $ref: '#/components/schemas/ResponseMeta' '404': description: No contact matches that user_id under the tenant's identity rules. components: schemas: ResponseMeta: type: object required: - request_id - timestamp additionalProperties: false properties: request_id: type: string description: Unique request identifier (also returned as X-Request-Id header) timestamp: type: string format: date-time docs_url: type: string format: uri nullable: true securitySchemes: Bearer: type: http scheme: bearer bearerFormat: JWT description: Dashboard JWT token from Clerk ApiKey: type: apiKey name: X-API-Key in: header description: Server-to-server API key (dv_live_sk_*) ````