[rossydefi]

Summary

This PR implements four critical operational features to enhance production stability and security:

• Incident Triage Runbook (Utix: Build operational runbook for incident triage and emergency rollback #89): Comprehensive incident management system with automated procedures, timeline tracking, and emergency rollback planning
• Signed Webhook Verification (Utix: Implement signed webhook verification and replay-window enforcement #88): HMAC-based webhook signature verification with replay attack protection and configurable time windows
• Privacy-Preserving Analytics (Utix: Add privacy-preserving analytics aggregation for maintainer insights #87): Event tracking with automatic PII redaction, identifier hashing, and aggregated maintainer insights
• Cross-Device Session Management (Utix: Implement cross-device session continuity and conflict handling #86): Multi-device session continuity with configurable conflict resolution and state synchronization

What's Included

Incident Runbook (core/incident/)

• Incident lifecycle management (create, investigate, mitigate, resolve)
• Registered procedures for common scenarios (database loss, error spikes, webhook failures)
• Timeline tracking and mitigation step management
• Automated rollback planning with validation steps

Webhook Verification (core/webhooks/)

• HMAC-SHA256/512 signature generation and verification
• Replay attack protection via nonce deduplication
• Configurable time windows and clock skew tolerances
• Subscriber management with delivery attempt tracking
• Automatic disabling of failed subscribers

Analytics Aggregation (core/analytics/)

• Privacy-by-default event tracking with automatic PII redaction
• Identifier hashing using SHA-256/512
• Configurable sampling and retention policies
• Automated insight generation (usage trends, error spikes, performance degradation, feature adoption)
• Multi-level aggregation (minute, hour, day, week)

Cross-Device Sessions (core/sessions/)

• Multi-device session management with primary device election
• Configurable conflict resolution strategies (last-write-wins, device-priority, manual)
• State synchronization with change tracking
• Automatic conflict detection and resolution
• Device status monitoring and cleanup

Testing

All modules include comprehensive test suites covering:

• Core functionality and edge cases
• Conflict detection and resolution
• Privacy controls and data redaction
• State synchronization across devices
• Signature verification and replay protection

Run tests with:

npm test

Integration Notes

• All modules are independent and can be used standalone
• Each module exposes clean TypeScript interfaces for type safety
• Error handling and logging are integrated with existing infrastructure
• No breaking changes to existing APIs

Closes #89
Closes #88
Closes #87
Closes #86

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