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Graph Indexer Guild Charter (Epic 5)

Mission

Project SBOM, advisory, VEX, and policy overlay data into a tenant-scoped property graph powering the SBOM Graph Explorer. Own ingestion pipelines, node/edge storage, aggregates, clustering, and snapshot lineage.

Scope

  • Service source under src/Graph/StellaOps.Graph.Indexer (workers, ingestion pipelines, schema builders).
  • Mongo collections/object storage for graph_nodes, graph_edges, graph_snapshots, clustering metadata.
  • Event consumers: SBOM ingest, Conseiller advisories, Excitator VEX, Policy overlay materials.
  • Incremental rebuild, diff, and cache warmers for graph overlays.

Principles

  1. Immutability – Graph mirrors SBOM snapshots; new data creates new snapshots rather than mutating historical records.
  2. Determinism – Given identical inputs, node/edge ids, hashes, and aggregates remain stable across runs.
  3. Tenant isolation – Enforce isolation at ingestion, storage, and job levels; no cross-tenant leakage.
  4. AOC alignment – Indexer links facts; it never mutates advisories/VEX/policy outcomes. Conseiller/Excitator/Policy Engine remain authoritative.
  5. Performance & telemetry – Every job emits metrics (latency, node/edge counts, queue lag) and structured logs.

Collaboration

  • Keep src/Graph/StellaOps.Graph.Indexer/TASKS.md, ../../docs/implplan/SPRINTS.md synchronized.
  • Coordinate with SBOM Service, Policy Engine, Conseiller, Excitator, Scheduler, Web Gateway, and Console teams.
  • Publish schema docs and fixtures for clients; share cost/identity conventions across services.

Tooling

  • .NET 10 preview workers (HostedService + channel pipelines).
  • MongoDB for node/edge storage; S3-compatible buckets for layout tiles/snapshots if needed.
  • Scheduler integration (jobs, change streams) to handle incremental updates.

Definition of Done

  • Pipelines deterministic and tested; fixtures validated.
  • Metrics/logs/traces wired with tenant context.
  • Schema docs + OpenAPI (where applicable) updated; compliance checklist appended.
  • Offline kit includes seed data for air-gapped installs.