> ## Documentation Index > Fetch the complete documentation index at: https://docs.arcuserp.com/llms.txt > Use this file to discover all available pages before exploring further. # Initiate RDS snapshot for cutover > Initiates an RDS point-in-time snapshot of the entity's database instance. Returns HTTP 202 immediately; snapshot creation is async (typically 5-20 min). Operator polls GET .../status or receives migration.snapshot_taken webhook when done. Requires migration:admin + migration:write scopes. In dev env: returns a stub snapshot (no real AWS call). ## OpenAPI ````yaml /openapi.yaml post /entities/{entity_id}/migration/cutover/snapshot openapi: 3.1.0 info: title: Arcus ERP Public API version: 1.0.0 description: > Arcus ERP public REST API. Designed for external integrations and data migration. **Authentication.** Bearer token (API key) via the `Authorization` header. Format: `Authorization: Bearer ark_live_ent__` (or `ark_test_*` for sandbox). API keys are issued per-entity in **Settings > Developers > API Keys**. **Entity scoping.** The entity is encoded in the API key prefix; routes are flat (e.g. `/v1/accounts`, `/v1/orders`, `/v1/products`). A small set of platform endpoints (migration, reconciliation, events, webhook endpoints, API keys) use the `/v1/entities/{entity_id}/...` form -- those are noted in their tags. **Key capabilities.** - Related-resource hydration via `?expand[]=` (see `x-arcus-expand` on each resource). - Cursor-based pagination (`starting_after` / `ending_before` / `limit`). - Idempotency via the `Idempotency-Key` header. - Webhook events for asynchronous notification. - Conditional requests / ETag for cache validation. servers: - url: https://api.arcuserp.com/v1 description: Arcus ERP API (accepts both live `ark_live_*` and test `ark_test_*` keys) - url: https://dev-api.arcuserp.com/v1 description: >- Dev sandbox API (test-only data, accepts `ark_test_*` keys against dev RDS) security: [] paths: /entities/{entity_id}/migration/cutover/snapshot: post: tags: - Migration - Cutover summary: Initiate RDS snapshot for cutover description: > Initiates an RDS point-in-time snapshot of the entity's database instance. Returns HTTP 202 immediately; snapshot creation is async (typically 5-20 min). Operator polls GET .../status or receives migration.snapshot_taken webhook when done. Requires migration:admin + migration:write scopes. In dev env: returns a stub snapshot (no real AWS call). operationId: postCutoverSnapshot parameters: - name: entity_id in: path required: true schema: type: string format: uuid requestBody: required: true content: application/json: schema: type: object required: - freeze_token properties: freeze_token: type: string format: uuid description: >- The freeze_token returned by POST .../freeze (confirms entity is frozen). description: type: string description: Optional human note stored in the cutover log. responses: '202': description: Snapshot initiated content: application/json: schema: $ref: '#/components/schemas/RDSSnapshot' '401': $ref: '#/components/responses/Error' '403': $ref: '#/components/responses/Error' '422': $ref: '#/components/responses/Error' security: - ApiKeyAuth: [] components: schemas: RDSSnapshot: type: object description: RDS snapshot initiated by cutover/snapshot endpoint. properties: object: type: string enum: - rds_snapshot entity_id: type: string format: uuid snapshot_id: type: string description: e.g. arcus-db-prod-cutover-wsspr-20260712-2202-a1b2c3d4 db_instance_id: type: string status: type: string enum: - creating - available - failed percent_progress: type: integer minimum: 0 maximum: 100 started_at: type: string format: date-time estimated_completion_at: type: string format: date-time env: type: string enum: - dev - staging - prod dev_stub: type: boolean description: True in dev env (no real AWS call made). cutover_log_id: type: string format: uuid ErrorEnvelope: type: object description: | Canonical error response envelope. All API errors use this shape. required: - error - code properties: error: type: string description: Machine-readable error key example: not_found code: type: string description: Machine-readable error code (often same as error) example: not_found type: type: string enum: - validation_error - permission_error - not_found - conflict - rate_limit - internal - expand_error - not_implemented example: not_found hint: type: string description: Human-readable one-sentence explanation (English) example: >- The requested order does not exist or does not belong to this entity. param: type: string description: The parameter that caused the error, if applicable example: expand[0] required: type: string description: The scope required (only on insufficient_scope errors) example: accounts:read request_id: type: string description: >- Unique request ID for support tracing (maps to CloudWatch log stream) example: req_abc123 responses: Error: description: Error response (400/401/403/404/409/422/429/500) content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' securitySchemes: ApiKeyAuth: type: http scheme: bearer description: | API key issued per entity via Settings > Developers > API Keys. Each key carries scopes (e.g. orders:read, products:write). Bearer token format: Authorization: Bearer ark_live_ent__ Test keys use ark_test_ent__. Both are issued per entity via Settings > Developers > API Keys. ````