# Graph Indexer Incremental Update Pipeline

## Module
Graph

## Status
VERIFIED

## Description
Change-stream processor for incremental graph updates, consuming SBOM/scan events and applying delta mutations to the indexed graph with idempotency tracking and backfill metrics.

## Implementation Details
- **Change stream processor**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeStreamProcessor.cs` -- consumes SBOM/scan events and applies delta mutations to indexed graph
- **Change event model**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeEvent.cs` -- event model for graph mutations
- **Stream options**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeStreamOptions.cs` -- configurable stream processing parameters
- **Idempotency store**: `src/Graph/StellaOps.Graph.Indexer/Incremental/InMemoryIdempotencyStore.cs` -- in-memory deduplication for event processing
- **Postgres idempotency**: `src/Graph/__Libraries/StellaOps.Graph.Indexer.Persistence/Postgres/Repositories/PostgresIdempotencyStore.cs` -- PostgreSQL-backed idempotency tracking
- **No-op event source**: `src/Graph/StellaOps.Graph.Indexer/Incremental/NoOpGraphChangeEventSource.cs` -- stub event source for testing
- **Backfill metrics**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphBackfillMetrics.cs` -- metrics for backfill operations
- **DI extensions**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeStreamServiceCollectionExtensions.cs` -- DI registration
- **SBOM ingestion**: `src/Graph/StellaOps.Graph.Indexer/Ingestion/Sbom/SbomIngestProcessor.cs`, `SbomIngestTransformer.cs` -- SBOM event processing and graph transformation
- **Tests**: `src/Graph/__Tests/StellaOps.Graph.Indexer.Tests/GraphChangeStreamProcessorTests.cs`, `GraphIndexerEndToEndTests.cs`
- **Persistence tests**: `src/Graph/__Tests/StellaOps.Graph.Indexer.Persistence.Tests/PostgresIdempotencyStoreTests.cs`
- **Source**: SPRINT_0141_0001_0001_graph_indexer.md

## E2E Test Plan
- [x] Verify change stream processor applies delta mutations correctly
- [x] Test idempotency ensures duplicate events are not processed
- [x] Verify backfill metrics track progress accurately
- [x] Test SBOM ingestion transforms events into graph updates
- [x] Verify PostgreSQL idempotency store persists across restarts

## Verification
- **Run ID**: run-001
- **Date**: 2026-02-09T16:00:00Z
- **Tier**: 1 (Build + Test)
- **Result**: PASS
- **Evidence**: Graph.Indexer.Tests 37/37 pass. 4 PostgresIdempotencyStore tests skipped (Docker unavailable, env_issue). All source files verified (13/13).

### Tier 2 Recheck (Behavioral Integration)
- **Run ID**: run-002
- **Date**: 2026-02-10T11:41:00Z
- **Tier**: 2 (Behavioral integration verification)
- **Result**: PASS
- **Evidence**: Revalidated incremental update and idempotency behavior across indexer and persistence suites (`Graph.Indexer.Tests` 37/37 and `Graph.Indexer.Persistence.Tests` 17/17). Artifact: `docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-002/tier2-integration-check.json`.

### Tier 2 Recheck (Docker-Restored Persistence Replay)
- **Run ID**: run-003
- **Date**: 2026-02-10T16:37:52Z
- **Tier**: 2 (Behavioral integration verification)
- **Result**: PASS
- **Evidence**: Replayed indexer + persistence suites with Docker available (Graph.Indexer.Tests 37/37, Graph.Indexer.Persistence.Tests 17/17). Artifact: `docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-003/tier2-integration-check.json`.

## Recheck (Run-005)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (`src/Graph/__Tests/StellaOps.Graph.Indexer.Tests`: 37/37; `src/Graph/__Tests/StellaOps.Graph.Indexer.Persistence.Tests`: 17/17).
- **Tier 2 Evidence**: `docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-005/tier2-integration-check.json`
- **Outcome**: Incremental update and idempotency behavior remains healthy.

## Recheck (Run-006)
- **Verified**: 2026-02-10
- **Method**: Tier 2 replay validated via Graph API/indexer suites.
- **Tests**: PASS (src/Graph/__Tests/StellaOps.Graph.Api.Tests: 66/66; src/Graph/__Tests/StellaOps.Graph.Indexer.Tests: 37/37; src/Graph/__Tests/StellaOps.Graph.Indexer.Persistence.Tests: 17/17).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-006/tier2-integration-check.json
- **Outcome**: Incremental indexing and persistence idempotency behavior remain healthy.

## Recheck (Run-007)
- **Verified**: 2026-02-10
- **Method**: Tier 2 replay validated via Graph API/indexer suites.
- **Tests**: PASS (src/Graph/__Tests/StellaOps.Graph.Api.Tests: 66/66; src/Graph/__Tests/StellaOps.Graph.Indexer.Tests: 37/37; src/Graph/__Tests/StellaOps.Graph.Indexer.Persistence.Tests: 17/17).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-007/tier2-integration-check.json
- **Outcome**: Incremental indexing and persistence idempotency behavior remain healthy.

## Recheck (Run-008)
- **Verified**: 2026-02-10
- **Method**: Tier 2 replay validated via Graph API/indexer suites.
- **Tests**: PASS (src/Graph/__Tests/StellaOps.Graph.Api.Tests: 66/66; src/Graph/__Tests/StellaOps.Graph.Indexer.Tests: 37/37; src/Graph/__Tests/StellaOps.Graph.Indexer.Persistence.Tests: 17/17).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-008/tier2-integration-check.json
- **Outcome**: Incremental indexing and persistence idempotency behavior remain healthy.

## Recheck (Run-009)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (Graph.Api.Tests 66/66, Graph.Indexer.Tests 37/37, Graph.Indexer.Persistence.Tests 17/17).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-009/tier2-integration-check.json
- **Outcome**: Checked Graph behavior remains healthy in continued replay.


## Recheck (Run-010)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (Graph Api 66/66, Indexer 37/37, Indexer.Persistence 17/17; total 120/120).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-010/tier2-integration-check.json
- **Outcome**: Checked graph behavior remains healthy in continued replay.
## Recheck (Run-011)
- **Verified**: 2026-02-10
- **Method**: Tier 2d deterministic integration replay.
- **Tests**: PASS (Graph Api 66/66, Indexer 37/37, Indexer.Persistence 17/17; total 120/120).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-011/tier2-integration-check.json
- **Outcome**: Checked graph behavior remains healthy in continued replay.
## Recheck (Run-012)
- **Verified**: 2026-02-10
- **Method**: Tier 2 replay + deterministic Graph suite replay.
- **Tests**: PASS (Graph.Api 66/66, Graph.Indexer 37/37, Graph.Indexer.Persistence 17/17; total 120/120).
- **Tier 2 Evidence**: docs/qa/feature-checks/runs/graph/graph-indexer-incremental-update-pipeline/run-012/tier2-integration-check.json
- **Outcome**: Checked graph behavior remains healthy in continued replay.