# Changelog of Dataset Deduplicator (`automation-lab/dataset-dedup`) Actor

- **URL**: https://apify.com/automation-lab/dataset-dedup/changelog.md
- **Full Actor documentation**: https://apify.com/automation-lab/dataset-dedup.md

## Changelog

### 2026-09-30

*Fixes*

- Prefilled source datasets with a public sample so the default input runs successfully without changing required customer dataset selection.

### 2026-09-19

*Fixes*

- Prevented composite-key collisions between field boundaries and preserved value types during exact matching.
- Runs now fail clearly when a requested source cannot be read or none of the selected fields exists, avoiding silent partial or collapsed output.

*Features*

- Added nested dot-path fields, per-field coverage, source completion, output destination, and truncation details to run stats.
- Improved source-dataset selection and made arbitrary passthrough records visible in the Dataset tab.

*Performance*

- Uploads Map values in bounded batches without creating a second full output array.

### 2026-03-22

*Features*

- Introduced Dataset Deduplicator for removing duplicate records across one or more Apify datasets using configurable field keys, comparison options, and first-or-last occurrence selection.