SBOM lineage ledger

Overview

• Tracks immutable SBOM versions per artifact reference.
• Exposes history, temporal queries, and deterministic diffs.
• Emits lineage edges to support graph joins and audit trails.

Endpoints

• GET /sbom/ledger/history?artifact=<ref>&limit=50&cursor=0
• GET /sbom/ledger/point?artifact=<ref>&at=<iso8601>
• GET /sbom/ledger/range?artifact=<ref>&start=<iso8601>&end=<iso8601>
• GET /sbom/ledger/diff?before=<versionId>&after=<versionId>
• GET /sbom/ledger/lineage?artifact=<ref>

Lineage relationships

• parent: explicit parent version link (supplied at ingest).
• build: versions emitted from the same CI build ID (from upload provenance).

Example lineage response

{
  "artifactRef": "example.com/app:1.2.3",
  "nodes": [{ "versionId": "v1", "sequenceNumber": 1, "digest": "sha256:..." }],
  "edges": [{ "fromVersionId": "v1", "toVersionId": "v2", "relationship": "build" }]
}

Notes

• Ledger storage is in-memory until PostgreSQL-backed persistence is wired.
• Ordering is deterministic by sequence number, then timestamp.