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openspec/archive/2026-04-19-enterprise-dedup/proposal.md

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+# 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`