---
title: "Trigger concept lookback backfill (Admin)"
method: POST
path: "/api/admin/concepts/{id}/trigger_lookback"
tags: ["concepts", "admin"]
---

# Trigger concept lookback backfill (Admin)

`POST /api/admin/concepts/{id}/trigger_lookback`

Trigger a background backfill worker to scan historical articles published in the last `N` days and evaluate them against this concept.

## Path parameters

- `id` integer, required

## Request body

- object
  - `days` integer, required

## Response `200`

successful

## Changes

> 59 revisions in range; 8 could not be searched.

- **2026-07-13** (v1) `189b62b952ea` — 1 info
  - endpoint added
- **2026-07-13** (v1) `7db6ba099285` — 1 info
  - endpoint added
- **2023-01-10** (v1) `754f8b25f815` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/forem/apis/forem-api-v1/changes/api/admin/concepts/:id/trigger_lookback/post.md)

---

[API](https://skmtc.dev/forem/apis/forem-api-v1.md) · [All operations](https://skmtc.dev/forem/apis/forem-api-v1/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/forem/forem-api-v1/revisions/1f64f71fc2a7/schema)