> ## Documentation Index > Fetch the complete documentation index at: https://docs.ankra.ai/llms.txt > Use this file to discover all available pages before exploring further. # Update Application Demo Configuration > Replace the application's saved demo defaults. env and database are replaced wholesale on every PUT. The stack_profile and base_stack blocks are written only when their key is present in the body: an absent key preserves the stored designation, an explicit null clears it, so a client that predates either block cannot silently drop a demo's dependencies. Secret environment values are submitted and echoed as ${SECRET_SLOT:} sentinels. A browser session twin is mounted at the same path without the /api/v1 prefix (cookie authentication plus the X-Ankra-CSRF double-submit header). ## OpenAPI ````yaml https://platform.ankra.app/openapi.json put /api/v1/org/applications/{application_id}/demo-config openapi: 3.1.0 info: title: FastAPI version: 0.1.0 servers: - url: https://platform.ankra.app security: [] paths: /api/v1/org/applications/{application_id}/demo-config: put: tags: - Applications API summary: Update Application Demo Configuration description: >- Replace the application's saved demo defaults. env and database are replaced wholesale on every PUT. The stack_profile and base_stack blocks are written only when their key is present in the body: an absent key preserves the stored designation, an explicit null clears it, so a client that predates either block cannot silently drop a demo's dependencies. Secret environment values are submitted and echoed as ${SECRET_SLOT:} sentinels. A browser session twin is mounted at the same path without the /api/v1 prefix (cookie authentication plus the X-Ankra-CSRF double-submit header). operationId: >- update_application_demo_configuration_api_v1_org_applications__application_id__demo_config_put parameters: - in: path name: application_id required: true schema: title: Application Id type: string - in: header name: authorization required: false schema: anyOf: - type: string - type: 'null' title: Authorization - in: header name: x-ankra-organisation-id required: false schema: anyOf: - type: string - type: 'null' title: X-Ankra-Organisation-Id requestBody: content: application/json: schema: $ref: '#/components/schemas/ApplicationDemoConfiguration' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/ApplicationDemoConfiguration' description: The saved configuration after the write '400': content: application/json: schema: $ref: '#/components/schemas/DemoDetailError' description: >- Validation failure (for example "stack_profile.profile_id must be a valid UUID." or "base_stack.id must be a valid UUID.") '401': description: Unauthorized '403': content: application/json: schema: $ref: '#/components/schemas/DemoDetailError' description: '"You do not have permission to configure application demos."' '404': content: application/json: schema: $ref: '#/components/schemas/DemoDetailError' description: Not found ("Application not found") '422': content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' description: Validation Error components: schemas: ApplicationDemoConfiguration: description: >- The application's saved demo defaults, served and accepted by GET/PUT demo-config. On PUT, env and database are replaced wholesale; stack_profile, base_stack, migrate_command, and database_extensions are written only when their key is present in the body (absent preserves the stored value, explicit null/empty clears it). properties: base_stack: anyOf: - $ref: '#/components/schemas/DemoConfigurationBaseStack' - type: 'null' description: >- The shared demo base stack demos of this application depend on; null keeps demos free of shared infrastructure. database: type: boolean database_extensions: anyOf: - items: type: string type: array - type: 'null' description: >- Postgres extensions the demo database creates at initdb (plain lowercase identifiers, e.g. vector). Requires database=true. env: items: $ref: '#/components/schemas/DemoEnvironmentEntry' type: array migrate_command: anyOf: - type: string - type: 'null' description: >- The command that provisions a fresh demo database's schema; runs through sh -c in the application image after the database gate, with the demo environment. Requires database=true or a base stack. stack_profile: anyOf: - $ref: '#/components/schemas/DemoConfigurationStackProfile' - type: 'null' description: The full-stack demo designation; null keeps demos single-service. required: - env - database type: object DemoDetailError: description: >- The FastAPI-style detail envelope the demo routes use for 400/403/404/409/502 responses. properties: detail: type: string required: - detail type: object HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' title: Detail type: array title: HTTPValidationError type: object DemoConfigurationBaseStack: description: >- The base-stack reference of a demo configuration. Only id is written on PUT; name and status are denormalized onto reads. properties: id: format: uuid type: string name: description: Read-only. type: string status: description: Read-only. type: string required: - id type: object DemoEnvironmentEntry: description: >- One demo environment entry. Secret values ride as ${SECRET_SLOT:} sentinels - the persisted form, safe to echo; resolved secrets never ride this surface. properties: name: type: string secret: type: boolean value: type: string required: - name - value - secret type: object DemoConfigurationStackProfile: description: The stack-profile block of a demo configuration. properties: enabled: type: boolean parameters: description: >- Secret parameter values ride as ${SECRET_SLOT:} sentinels. Entries with an empty name are dropped on PUT. Always present on reads. items: $ref: '#/components/schemas/DemoStackParameter' type: array profile_id: format: uuid type: string profile_name: description: Denormalized onto reads only; ignored on PUT. type: string version: anyOf: - type: integer - type: 'null' description: Null tracks the profile's current version. required: - enabled - profile_id type: object ValidationError: properties: loc: items: anyOf: - type: string - type: integer title: Location type: array msg: title: Message type: string type: title: Error Type type: string required: - loc - msg - type title: ValidationError type: object DemoStackParameter: description: >- One stack-profile parameter binding. Secret values ride as ${SECRET_SLOT:} sentinels, never resolved values. properties: name: type: string value: type: string required: - name - value type: object ````