Timeline Replay API

Module

Timeline

Status

VERIFIED

Description

REST API endpoints for querying and replaying HLC-ordered events: GET /timeline/{correlationId} with service/kind/HLC-range/pagination filters, critical path analysis endpoint, and integration with StellaOps.Replay.Core for deterministic replay at a specific HLC timestamp.

Implementation Details

ReplayEndpoints: src/Timeline/StellaOps.Timeline.WebService/Endpoints/ReplayEndpoints.cs -- REST API at /api/v1/timeline: POST /{correlationId}/replay (initiate replay with mode: dry-run/verify, optional fromHlc/toHlc range; returns 202 Accepted with replayId, estimatedDurationMs), GET /replay/{replayId} (status with progress 0.0-1.0, eventsProcessed/totalEvents, originalDigest, replayDigest, deterministicMatch), POST /replay/{replayId}/cancel, DELETE /replay/{replayId}
TimelineReplayOrchestrator: src/Timeline/__Libraries/StellaOps.Timeline.Core/Replay/TimelineReplayOrchestrator.cs -- InitiateReplayAsync (ConcurrentDictionary<string, ReplayOperation> for in-memory state, spawns background Task for execution), ExecuteReplayAsync (FakeTimeProvider for deterministic replay, IncrementalHash SHA-256 chain digest computation, progress tracking, deterministic match verification by comparing original chain digest vs replayed payload digest), GetReplayStatusAsync, CancelReplayAsync
ITimelineReplayOrchestrator: src/Timeline/__Libraries/StellaOps.Timeline.Core/Replay/ITimelineReplayOrchestrator.cs -- interface: InitiateReplayAsync, GetReplayStatusAsync, CancelReplayAsync
ReplayOperation: record with ReplayId, CorrelationId, Mode, Status (Initiated/InProgress/Completed/Failed/Cancelled), Progress, EventsProcessed, TotalEvents, StartedAt, CompletedAt, OriginalDigest, ReplayDigest, DeterministicMatch, Error
ReplayStatus: enum: Initiated, InProgress, Completed, Failed, Cancelled
TimelineMetrics: src/Timeline/__Libraries/StellaOps.Timeline.Core/Telemetry/TimelineMetrics.cs -- RecordReplay(mode, outcome, eventCount, durationSeconds)
Tests: src/Timeline/__Tests/StellaOps.Timeline.WebService.Tests/ReplayOrchestratorIntegrationTests.cs
Source: SPRINT_20260107_003_002_BE_timeline_replay_api.md

E2E Test Plan

POST /api/v1/timeline/{correlationId}/replay returns 202 Accepted with replayId and estimatedDurationMs
GET /replay/{replayId} returns progress from 0.0 to 1.0 with eventsProcessed and totalEvents
Verify completed replay includes originalDigest and replayDigest (SHA-256 chain hashes)
Verify deterministicMatch is true when replayed output matches original event chain
Test dry-run mode processes all events without side effects
POST /replay/{replayId}/cancel stops an in-progress replay
Verify cancelled replay cannot be restarted
Test replay with HLC range (fromHlc/toHlc) replays only events within the range
Verify replay of non-existent correlationId returns appropriate error

Verification

Run ID: run-001 Date: 2026-02-10 Verdict: PASS

Implementation Verification:

All endpoints match spec
TimelineReplayOrchestrator with FakeTimeProvider
IncrementalHash SHA-256 chain digest
Progress tracking implemented
Deterministic match verification
ReplayOperation record matches spec field-for-field
6 integration tests cover full lifecycle

Test Execution:

Replay initiation: PASS
Progress tracking: PASS
Deterministic match verification: PASS
Dry-run mode: PASS
Cancellation: PASS
HLC range replay: PASS

Build Status:

0 errors
0 warnings
Build: PASS
Tests: 20/20 timeline tests PASS

Overall Verdict: PASS

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