# OpenSpec Change: enterprise-dedup

- **Change ID**: enterprise-dedup
- **Package**: `@suaveplan/dedup`
- **Category**: universal
- **Target path**: `universal/data/dedup`
- **Status**: PROPOSED
- **Date**: 2026-04-19
- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/dedup.md`

## Summary
Greenfield rebuild of `@suaveplan/dedup` — an entity deduplication engine with pluggable match keys, scoring rules, and merge strategies (latest-wins, manual, scored-merge). Computes similarity via Jaro-Winkler and Levenshtein.

## Current-state audit (genesis)
Package does not exist yet — fresh build.

## Dependencies
- Workspace: none (leaf)
- External (via catalog): `zod`, `tslib`, `@opentelemetry/api`
- Dev (via catalog): `vitest`, `@vitest/coverage-istanbul`, `fast-check`, `mitata`

## Preserved public surface
- `DedupEngine` — `detect(entities, config)`, `merge(group, strategy)`.
- Merge strategies: `latestWinsStrategy`, `manualStrategy`, `scoredMergeStrategy`.
- Similarity: `computeSimilarity`, `exactMatch`, `jaroWinklerSimilarity`, `levenshteinDistance`.
- Types: `DedupConfig`, `DuplicateGroup`, `MatchKey`, `MergeResult`, `MergeStrategy`, `ScoringRule`.

## New genesis additions
- Codes: `DEDUP.INVALID_CONFIG`, `DEDUP.STRATEGY_ERROR`.
- Zod schemas for `DedupConfig`, `ScoringRule`, `MatchKey`.
- OTel counter `dedup.groups.total`, histogram `dedup.detect.duration_ms`.
- Property tests: grouping is reflexive (`detect([x]).length === 0 duplicates`), symmetric, and scoring-rule weights in `[0, 1]`.

## Impact
- Adds one new package: `universal/data/dedup`
- Adds one new spec capability: `dedup`