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Timeline Indexer Service

Module

Timeline

Status

IMPLEMENTED

Description

Dedicated service for ingesting, indexing, and querying timeline events across all platform modules, with Postgres-backed storage (RLS), REST APIs for event retrieval, and evidence linkage to correlate events with attestation artifacts.

Implementation Details

  • TimelineQueryService: src/Timeline/__Libraries/StellaOps.Timeline.Core/TimelineQueryService.cs -- central query service: GetByCorrelationIdAsync (HLC range, service/kind filters, limit/offset pagination, cursor-based paging via HLC sortable strings), GetCriticalPathAsync (builds stage list from consecutive event pairs, sorts by duration descending), GetByServiceAsync (service-scoped queries with HLC cursor)
  • ITimelineQueryService: src/Timeline/__Libraries/StellaOps.Timeline.Core/ITimelineQueryService.cs -- query interface
  • ITimelineEventStore: referenced from StellaOps.Eventing.Storage -- PostgreSQL-backed event store: GetByCorrelationIdAsync, GetByHlcRangeAsync, GetByServiceAsync, CountByCorrelationIdAsync; append-only with RLS for tenant isolation
  • TimelineEndpoints: src/Timeline/StellaOps.Timeline.WebService/Endpoints/TimelineEndpoints.cs -- REST API: GET /api/v1/timeline/{correlationId} (with fromHlc, toHlc, services, kinds, limit, offset query parameters; returns events, totalCount, hasMore, nextCursor), GET /{correlationId}/critical-path
  • ExportEndpoints: src/Timeline/StellaOps.Timeline.WebService/Endpoints/ExportEndpoints.cs -- export API: POST /{correlationId}/export (NDJSON/JSON format, optional DSSE signing), GET /export/{exportId} (status), GET /export/{exportId}/download (bundle download)
  • TimelineBundleBuilder: src/Timeline/__Libraries/StellaOps.Timeline.Core/Export/TimelineBundleBuilder.cs -- asynchronous bundle building with progress tracking, NDJSON/JSON serialization, optional DSSE signing via IEventSigner
  • ServiceCollectionExtensions: src/Timeline/__Libraries/StellaOps.Timeline.Core/ServiceCollectionExtensions.cs -- DI registration for timeline services
  • TimelineMetrics: src/Timeline/__Libraries/StellaOps.Timeline.Core/Telemetry/TimelineMetrics.cs -- OpenTelemetry metrics: replay and export operation tracking
  • Tests: src/Timeline/__Tests/StellaOps.Timeline.Core.Tests/TimelineQueryServiceTests.cs, src/Timeline/__Tests/StellaOps.Timeline.WebService.Tests/TimelineApiIntegrationTests.cs
  • Source: SPRINT_0165_0001_0001_timelineindexer.md

E2E Test Plan

  • Verify GET /api/v1/timeline/{correlationId} returns indexed events with correct HLC ordering
  • Test service and kind filters narrow indexed results
  • Verify HLC range queries (fromHlc/toHlc) return correct event subsets
  • Test cursor-based pagination produces consistent results across pages
  • Verify critical path endpoint computes stage durations and percentages correctly
  • Test export API: initiate -> check status -> download bundle
  • Verify NDJSON export includes all event fields (event_id, t_hlc, ts_wall, service, kind, payload_digest, engine_version)
  • Test evidence linkage: events with attestation references are queryable by correlation