feat: Add security hardening, agentic coding infrastructure, and test framework

- Add SECRET_KEY and ENCRYPTION_KEY validation on startup - Implement security headers middleware (X-Frame-Options, CSP, HSTS) - Add CSRF protection middleware - Create comprehensive GitHub issue templates and PR template - Add Makefile with common development tasks - Configure pre-commit hooks (black, ruff, mypy, bandit, detect-secrets) - Create docs/CODING_PATTERNS.md with best practices - Create docs/ERRORS.md documenting all error codes - Add Architecture Decision Records (ADR) for Celery and Fernet encryption - Create CHANGELOG.md for version tracking - Set up pytest test infrastructure with fixtures and factories - Add sample unit tests for security and config validation - Create CI/CD workflows (test, lint, security) - Add comprehensive TODO.md with milestones and progress tracking Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
2026-02-06 22:01:11 +00:00
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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- GitHub issue templates (bug report, feature request, test needed)
+- Pull request template with comprehensive checklist
+- `docs/CODING_PATTERNS.md` with development best practices
+- `docs/ERRORS.md` documenting all error codes
+- `docs/adr/` directory with Architecture Decision Records
+- `Makefile` with common development tasks
+- `.pre-commit-config.yaml` for code quality enforcement
+- `CHANGELOG.md` for version tracking
+- Security validation for SECRET_KEY and ENCRYPTION_KEY on startup
+- CSRF protection middleware
+- Security headers middleware (X-Frame-Options, CSP, HSTS)
+- Rate limiting per user/tier
+- Comprehensive test infrastructure setup
+- CI/CD pipeline for testing and security scanning
+
+### Changed
+- Reorganized documentation into `docs/` directory
+- Improved error handling with specific exception types
+- Updated datetime usage to timezone-aware
+- Enhanced logging with structured context
+
+### Fixed
+- Bare exception handlers replaced with specific types
+- Open redirect vulnerability in OAuth redirect_uri
+- Default encryption keys security issue
+
+### Security
+- All dependencies updated to patched versions
+- Security headers added to all API responses
+- Input validation improved for all endpoints
+- Credential handling audited and improved
+
+## [1.0.0] - 2026-02-01
+
+### Added
+- Multi-tenant SaaS backend with FastAPI
+- JWT and OAuth2 (Google Sign-In) authentication
+- Encrypted credential storage with Fernet
+- Subscription management with Stripe integration
+- PostgreSQL database with SQLAlchemy ORM
+- Redis for caching and session management
+- Celery for background task processing
+- Apprise for multi-channel notifications
+- Docker and docker-compose support
+- Comprehensive API documentation with OpenAPI
+- Extensive documentation (README, ARCHITECTURE, SECURITY_REPORT, etc.)
+
+### Changed
+- Upgraded from single-user script to multi-tenant platform
+
+## [0.1.0] - 2025-12-15 (Legacy Version)
+
+### Added
+- Initial release of single-user pop3_forwarder.py script
+- Docker support with docker-compose
+- Multiple POP3 account support
+- Gmail forwarding via SMTP
+- Rate limiting and throttling
+- Error notifications via Postmarkapp
+- Environment-based configuration
+- Basic logging
+
+---
+
+## Version History
+
+- **[Unreleased]** - Current development (agentic coding improvements, security hardening)
+- **[1.0.0]** - Multi-tenant SaaS platform (2026-02-01)
+- **[0.1.0]** - Legacy single-user script (2025-12-15)
+
+---
+
+## How to Update This Changelog
+
+### Categories
+
+Use these standard categories:
+- **Added** - New features
+- **Changed** - Changes in existing functionality
+- **Deprecated** - Soon-to-be removed features
+- **Removed** - Removed features
+- **Fixed** - Bug fixes
+- **Security** - Vulnerability fixes
+
+### Format
+
+```markdown
+## [Version] - YYYY-MM-DD
+
+### Added
+- New feature description (#issue-number)
+
+### Fixed
+- Bug fix description (#issue-number)
+```
+
+### Workflow
+
+1. Add unreleased changes to `[Unreleased]` section
+2. When releasing, move unreleased changes to new version section
+3. Add version number, date, and comparison link
+4. Create git tag: `git tag -a v1.0.0 -m "Release v1.0.0"`
+
+---
+
+**Maintained by**: Development Team  
+**Last Updated**: 2026-02-06