> ## Documentation Index > Fetch the complete documentation index at: https://docs.go.aiinsurance.io/llms.txt > Use this file to discover all available pages before exploring further. # Rewrite stored Policy field values for a migration > Maintenance-only compare-and-swap rewrite of a Policy's complete stored history. The server maps each logical `policy.*` path across every stored policy segment version and the direct or container values in its transaction deltas, then fingerprints the canonically sorted occurrence descriptors. A `dryRun: true` request returns the current and projected fingerprints plus exact current occurrences without writing. Those reviewed fingerprints feed an applying request. A `dryRun: false` request changes data only when the current fingerprint equals `expectedPreFingerprint`. It atomically rewrites all matching values, recomputes hashes for touched segments, verifies the exact reviewed postimage, and writes one audit record. Replaying the same request after a successful migration returns `unchanged` without a mutation audit row. Any other current state returns a typed `409` with the current fingerprint and occurrences and writes nothing. This is deliberately not a general Policy update endpoint. **Required permission:** none — staff level `staff` (a staff user's own Bearer token or the platform service identity); no API key is accepted. ## OpenAPI ````yaml /openapi/generated-external-api.yaml post /api/v1/companies/{companyId}/policies/{policyId}/field-value-rewrites openapi: 3.0.3 info: title: AI Insurance External API description: External API for AI Insurance platform version: 1.0.0 contact: email: support@aiinsurance.io servers: - url: https://go.aiinsurance.io description: Production security: - ApiKeyAuth: [] paths: /api/v1/companies/{companyId}/policies/{policyId}/field-value-rewrites: post: tags: - Field Model Policy Transactions summary: Rewrite stored Policy field values for a migration description: > Maintenance-only compare-and-swap rewrite of a Policy's complete stored history. The server maps each logical `policy.*` path across every stored policy segment version and the direct or container values in its transaction deltas, then fingerprints the canonically sorted occurrence descriptors. A `dryRun: true` request returns the current and projected fingerprints plus exact current occurrences without writing. Those reviewed fingerprints feed an applying request. A `dryRun: false` request changes data only when the current fingerprint equals `expectedPreFingerprint`. It atomically rewrites all matching values, recomputes hashes for touched segments, verifies the exact reviewed postimage, and writes one audit record. Replaying the same request after a successful migration returns `unchanged` without a mutation audit row. Any other current state returns a typed `409` with the current fingerprint and occurrences and writes nothing. This is deliberately not a general Policy update endpoint. **Required permission:** none — staff level `staff` (a staff user's own Bearer token or the platform service identity); no API key is accepted. operationId: rewritePolicyFieldValues parameters: - $ref: '#/components/parameters/companyId' - $ref: '#/components/parameters/policyIdPath' requestBody: required: true content: application/json: schema: oneOf: - type: object additionalProperties: false required: - dryRun - rewrites properties: dryRun: type: boolean enum: - true rewrites: type: array minItems: 1 items: $ref: '#/components/schemas/PolicyFieldValueRewrite' - type: object additionalProperties: false required: - dryRun - expectedPreFingerprint - expectedPostFingerprint - rewrites properties: dryRun: type: boolean enum: - false expectedPreFingerprint: type: string pattern: ^[0-9a-f]{64}$ description: >- Reviewed SHA-256 fingerprint of the exact preimage occurrences. expectedPostFingerprint: type: string pattern: ^[0-9a-f]{64}$ description: >- Reviewed SHA-256 fingerprint of the exact postimage occurrences. rewrites: type: array minItems: 1 items: $ref: '#/components/schemas/PolicyFieldValueRewrite' examples: previewPercentageMigration: value: dryRun: true rewrites: - path: policy.commissionPercentage expectedValue: 25 replacementValue: 0.25 percentageMigration: value: dryRun: false expectedPreFingerprint: >- 711b836b01292b2fe6bd4e2897de598c6fa4954d023749a2866c023112a18b8d expectedPostFingerprint: >- 1da1aa47f7ab3ffca098aa966332457aceb79281532fbc8a3301b4d5a2c11f7b rewrites: - path: policy.commissionPercentage expectedValue: 25 replacementValue: 0.25 responses: '200': description: >- A read-only fingerprint preview, a changed Policy history, or an already-applied no-op. content: application/json: schema: oneOf: - type: object required: - status - currentFingerprint - projectedFingerprint - occurrences properties: status: type: string enum: - dryRun currentFingerprint: type: string pattern: ^[0-9a-f]{64}$ projectedFingerprint: type: string pattern: ^[0-9a-f]{64}$ occurrences: type: array items: oneOf: - $ref: >- #/components/schemas/PolicySegmentFieldValueOccurrence - $ref: >- #/components/schemas/PolicyTransactionDeltaFieldValueOccurrence - type: object required: - status - fingerprint - occurrences properties: status: type: string enum: - changed - unchanged fingerprint: type: string pattern: ^[0-9a-f]{64}$ occurrences: type: array items: oneOf: - $ref: >- #/components/schemas/PolicySegmentFieldValueOccurrence - $ref: >- #/components/schemas/PolicyTransactionDeltaFieldValueOccurrence examples: changed: value: status: changed fingerprint: >- 1da1aa47f7ab3ffca098aa966332457aceb79281532fbc8a3301b4d5a2c11f7b occurrences: - surface: policySegment policyVersion: 1 startDate: '2025-01-01' path: policy.commissionPercentage valuePath: /commissionPercentage value: 0.25 '400': description: The strict rewrite manifest is invalid. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': description: The live Policy does not exist in the company named by the URL. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '409': description: >- The current preimage or projected postimage differs from the reviewed manifest; nothing was written. content: application/json: schema: $ref: '#/components/schemas/PolicyFieldValueRewriteConflict' '500': $ref: '#/components/responses/InternalServerError' security: - BearerAuth: [] - ApiKeyAuth: [] components: parameters: companyId: name: companyId in: path required: true schema: type: string format: uuid description: Company identifier policyIdPath: name: policyId in: path required: true schema: type: string format: uuid description: Policy identifier schemas: PolicyFieldValueRewrite: type: object description: >- One exact value mapping. The same path may appear more than once when Policy history contains different raw values, but each path/expectedValue pair must be unique so one physical occurrence can match at most one mapping. additionalProperties: false required: - path - expectedValue - replacementValue properties: path: type: string pattern: ^policy(?:\.[A-Za-z0-9_-]+)+$ example: policy.commissionPercentage expectedValue: description: The exact value to replace wherever this logical path occurs. replacementValue: description: The canonical replacement value. PolicySegmentFieldValueOccurrence: type: object additionalProperties: false required: - surface - policyVersion - startDate - path - valuePath - value properties: surface: type: string enum: - policySegment policyVersion: type: integer startDate: type: string format: date path: type: string valuePath: type: string description: JSON Pointer within the bare policy segment blob. value: {} PolicyTransactionDeltaFieldValueOccurrence: type: object additionalProperties: false required: - surface - transactionId - deltaId - deltaPath - path - valuePath - value properties: surface: type: string enum: - policyTransactionDelta transactionId: type: string format: uuid deltaId: type: string format: uuid deltaPath: type: string path: type: string valuePath: type: string description: JSON Pointer within the delta value; empty for a direct delta. value: {} ErrorResponse: type: object description: Standard error response for all external API endpoints required: - error properties: error: type: object required: - code - message properties: code: type: string description: Machine-readable error code example: VALIDATION_ERROR message: type: string description: Human-readable error message example: 'submissionId: Required field is missing' userMessages: type: array description: >- Clean, verbatim-displayable messages — one entry per failure, free of error-code tags, field paths, and internal noise. Suitable for showing to end users as-is. items: type: string example: - Exposures of type 'company' require an address details: type: array description: Additional details for validation errors (field-level errors) items: type: object properties: field: type: string description: The field that caused the error example: submissionId code: type: string description: Stable problem code for this individual validation failure example: BLANK_LIST_ELEMENT reason: type: string description: Stable reason the value violates its canonical contract example: blank-list-element expected: type: string description: The expected canonical value contract example: nonblank trimmed string message: type: string description: Description of the field error example: Required field is missing PolicyFieldValueRewriteConflict: type: object required: - error properties: error: type: object required: - code - message - expectedPostFingerprint - occurrences properties: code: type: string enum: - policy-field-value-rewrite-preimage-mismatch - policy-field-value-rewrite-postimage-mismatch message: type: string userMessages: type: array items: type: string expectedPreFingerprint: type: string pattern: ^[0-9a-f]{64}$ expectedPostFingerprint: type: string pattern: ^[0-9a-f]{64}$ currentFingerprint: type: string pattern: ^[0-9a-f]{64}$ actualPostFingerprint: type: string pattern: ^[0-9a-f]{64}$ occurrences: type: array items: oneOf: - $ref: '#/components/schemas/PolicySegmentFieldValueOccurrence' - $ref: >- #/components/schemas/PolicyTransactionDeltaFieldValueOccurrence responses: Unauthorized: description: Unauthorized - Invalid or missing API key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: missingApiKey: summary: Missing API key value: error: code: AuthenticationError message: API key authentication required userMessages: - API key authentication required invalidApiKey: summary: >- Invalid API key (e.g. unknown key, or a Bearer token used instead of an API key) value: error: code: AuthenticationError message: Invalid API key userMessages: - Invalid API key Forbidden: description: Forbidden - Insufficient permissions content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: insufficientPermissions: summary: Insufficient permissions value: error: code: AuthorizationError message: User is not authorized to perform the requested action userMessages: - User is not authorized to perform the requested action companyMismatch: summary: A valid API key naming another company in the URL value: error: code: AuthorizationError message: API key is not scoped to the requested company userMessages: - API key is not scoped to the requested company InternalServerError: description: Internal Server Error - Unexpected error occurred content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: internalError: summary: Unexpected server error value: error: code: UncaughtActionError message: Uncaught error occurred in userMessages: - An unexpected error occurred. Please try again later. securitySchemes: ApiKeyAuth: type: apiKey in: header name: Authorization description: >- API key authentication. Send your raw API key as the `Authorization` header value with NO scheme prefix — `Authorization: YOUR-API-KEY`. Do NOT prefix it with `Bearer ` or `ApiKey `, and do not use an `X-API-Key` header; those are not accepted. BearerAuth: type: http scheme: bearer bearerFormat: JWT description: >- User-principal OAuth 2.0 Bearer authentication. Send a user-scoped Auth0 access token (audience = the app API audience) as `Authorization: Bearer `. The request resolves to the user's identity and is authorized by their Role on the `{companyId}` in the path — the same role-based permissions the web app enforces. This is the path the MCP connector uses to act on a user's behalf; endpoints that accept it list both `BearerAuth` and `ApiKeyAuth`. ````