Data retention and privacy

How Four Echelon handles API metadata, uploaded CAD files, and model outputs. Use this page when answering security questionnaires or designing customer data flows.

Retention summary

API request metadataBilling period + audit window

Request ids, route, token counts, and status codes for metering and support.

Uploaded CAD filesProcessing only

Single extractions are processed in memory. Batch uploads are staged in storage only until their item finishes (or the batch expires), then deleted.

Batch extraction results24 hours

Per-item extraction JSON for /api/v1/cad/extract/batch is retained until the batch's expires_at, then deleted by a scheduled cleanup.

Model outputsCustomer responsibility

Store reasoning_scene and extraction JSON in your systems if you need history.

Training dataNot customer uploads by default

Production inference does not use customer CAD uploads for model training unless a separate agreement says otherwise.