# Reset impact estimations for a pipeline

**POST** `/v1/pipelines/{pipelineId}/exceptions/impact-estimation-reset`

**Operation ID**: `resetImpactEstimation`
**Summary**: Reset impact estimations for a pipeline
Clears the cached impact percentage and last-updated timestamp on estimation rows in the pipeline's scope. The hourly impact-estimation cycle picks up the cleared rows on its next tick; fresh values appear on a later poll. Rows currently being processed by an active estimation job are skipped and retain their values until that job completes. Returns the number of rows cleared; zero indicates a no-op (no opted-in sink datasets, or no estimation-capable source integrations).

## Tags
- Pipeline Exceptions
## Parameters

- **pipelineId** (required) - path
  - Pipeline ID to reset estimations for
  - Type: string

## Responses

### 200

Reset complete

- **Content-Type**: `application/json` / `ResetImpactEstimationResponse`
### 401

Unauthorized

### 404

Not Found - Pipeline not found.