# Documentation Updates Summary - 2026-03-19

## 🎯 Purpose
This document summarizes all documentation updates made to reflect the backend security hardening and dependency updates completed on 2026-03-19.

## 📋 Updates Completed

### 1. CHANGELOG.md
- ✅ Added comprehensive "Backend Security & Dependency Updates (2026-03-19)" section
- ✅ Documented all 52 vulnerabilities fixed (27 high + 20 moderate + 5 low)
- ✅ Listed major package upgrades: Elasticsearch 9.3.4, Nodemailer 8.0.3, UUID 13.0.0, @types/node 25.5.0
- ✅ Documented Jest configuration updates for UUID v13 compatibility
- ✅ Added package management status (0 vulnerabilities)

### 2. README.md
- ✅ Updated project status to "UAT Ready, Security Hardened (2026-03-19)"
- ✅ Updated backend status to show "0 Vulnerabilities"
- ✅ Updated technology stack section with Elasticsearch 9.3.4 and Nodemailer 8.0.3
- ✅ Added security status line in backend tech stack
- ✅ Updated Version 1.8.1 section to include security hardening achievements
- ✅ Added "Security Hardening (2026-03-19)" subsection with vulnerability details

### 3. CONTRIBUTING.md
- ✅ Added security labels example in issue creation section
- ✅ Updated document history template to include security status
- ✅ Added security status line: "Security: 0 vulnerabilities (backend)"
- ✅ Updated version to 1.8.1 and date to 2026-03-19

### 4. AGENTS.md
- ✅ Updated project status to "UAT Ready, Security Hardened (2026-03-19)"
- ✅ Updated Elasticsearch version from 8.11 to 9.3.4
- ✅ Added security status: "0 vulnerabilities (as of 2026-03-19)"
- ✅ Updated backend status to show "0 Vulnerabilities"

### 5. Security Operations Spec (specs/04-Infrastructure-OPS/04-06-security-operations.md)
- ✅ Updated version from 1.8.0 to 1.8.1
- ✅ Updated last updated date to 2026-03-19
- ✅ Added comprehensive security status section
- ✅ Documented vulnerability resolution details
- ✅ Listed major security updates applied

### 6. Backend Guidelines (specs/05-Engineering-Guidelines/05-02-backend-guidelines.md)
- ✅ Updated version from 1.5.0 to 1.8.1
- ✅ Updated last updated date to 2026-03-19
- ✅ Added "Zero Vulnerabilities" principle to guidelines
- ✅ Documented dependency maintenance commitment

## 📊 Key Changes Highlighted

### Security Achievements
- **52 vulnerabilities resolved** (27 high + 20 moderate + 5 low)
- **0 known vulnerabilities** current status
- **Major package updates** for security
- **Security overrides implemented** via pnpm audit

### Technology Stack Updates
- **Elasticsearch**: 8.19.1 → 9.3.4
- **Nodemailer**: 7.0.11 → 8.0.3
- **UUID**: 11.1.0 → 13.0.0
- **@types/node**: 22.19.1 → 25.5.0

### Process Improvements
- **Jest configuration** updated for UUID v13 ES modules
- **Build verification** completed successfully
- **Test compatibility** maintained
- **Package management** streamlined

## 🎯 Impact

### Documentation Accuracy
- All documentation now reflects current security status
- Technology stack versions are up-to-date
- Security achievements are properly documented
- Process improvements are captured for future reference

### Stakeholder Communication
- Clear security status reporting
- Transparent vulnerability management process
- Updated project readiness indicators
- Enhanced trust through documented security practices

### Development Team Benefits
- Clear guidelines for dependency management
- Updated security principles in engineering guidelines
- Accurate technology stack information
- Documented best practices for maintenance

## ✅ Validation Checklist

- [x] All files updated with correct version (1.8.1)
- [x] All dates updated to 2026-03-19
- [x] Security status accurately reflected (0 vulnerabilities)
- [x] Technology stack versions updated
- [x] Process improvements documented
- [x] Consistent formatting maintained
- [x] Internal links verified
- [x] Thai language consistency maintained

---

**Document Status**: Complete
**Last Updated**: 2026-03-19
**Next Review**: After next dependency update cycle
