Phase 24.3: Complete planning documentation for advanced database features

[Copilot]

Summary

Located Phase 24.3 requirements in PHASE24.2_IMPLEMENTATION_SUMMARY.md and created comprehensive planning documentation for 7 advanced database features: MFA sessions, state sync, backup/recovery, replication/HA, InfluxDB metrics, testing, and CMake integration.

Details

• Bug fix
• New feature
• Performance improvement
• Documentation / tooling

What changed?

5 planning documents created (2,986 lines, 84.8 KB):

• PHASE24.3_INDEX.md (426 lines) - Navigation and document relationships
• PHASE24.3_SUMMARY.md (283 lines) - Executive overview, stakeholder guide
• PHASE24.3_QUICK_REFERENCE.md (282 lines) - Developer quick reference, code examples, commands
• PHASE24.3_PLANNING.md (1,076 lines) - Technical specifications, API designs, schema extensions
• PHASE24.3_ROADMAP.md (919 lines) - Day-by-day implementation guide (22 days/4 weeks)

Planning scope:

1. Session Management + MFA (TOTP RFC 6238, device fingerprinting)
2. Real-time State Synchronization (pub/sub, conflict resolution, <100ms latency)
3. Backup & Recovery (PITR, encryption, retention policies)
4. Replication & HA (PostgreSQL streaming, Redis Sentinel, <30s failover)
5. InfluxDB Metrics (time-series, dashboards, alerting)
6. Testing (Google Test, >80% coverage, perf/security tests)
7. CMake Build Integration (vcpkg deps, test targets)

Key artifacts:

• 3 new database migrations (session/MFA, backup history, replication status)
• API designs for all components with code examples
• Performance targets (1K+ ops/sec sessions, 10K+ metrics/sec)
• Security requirements (zero SQL injection, encrypted backups)
• Risk assessment and mitigation strategies
• Week-by-week task breakdown with deliverables

Rationale

Phase 24.2 delivered foundational database layer. Phase 24.3 explicitly identified in PHASE24.2_IMPLEMENTATION_SUMMARY.md as "Remaining Work (Phase 24.3 Optional)" requiring planning before implementation. Comprehensive planning ensures:

• Clear technical specifications prevent scope creep
• Day-by-day roadmap enables tracking and estimation
• Security/performance requirements defined upfront
• Testing strategy integrated from start
• Risk mitigation addressed before code written

Aligns with RootStream goals: detailed planning maintains simplicity by avoiding over-engineering, performance targets ensure low latency, comprehensive testing ensures reliability.

Testing

N/A - Documentation only. All markdown files validated for proper formatting.

Notes

• Follow-up: Implementation begins Week 1 Day 1 per PHASE24.3_ROADMAP.md
• Resource impact: None (planning docs only)
• Dependencies: PostgreSQL 12+, Redis 6+, InfluxDB 2.0+, CMake 3.15+, vcpkg packages (libpqxx, hiredis, nlohmann-json, influxdb-cxx, gtest, openssl)

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