Add CHANGELOG.md documenting v1.4.1 fixes and testing

- Complete changelog with version history
- Documented all bugs fixed today
- Test results for 14 portfolio endpoints
- Known issues and future improvements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: rainerstudios

CHANGELOG.md

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+# Changelog
+
+All notable changes to the CS2 Float API will be documented in this file.
+
+## [1.4.1] - 2025-11-01
+
+### Fixed
+- **Steam Inventory Sync**: Fixed item names saving incorrectly
+  - Changed from `item.name` to `item.market_name`
+  - Items now save as "AK-47 | Redline (Field-Tested)" instead of just "AK-47"
+  - Location: `index.js:4119`
+
+- **Steam Inventory Sync**: Fixed price fetching from cache
+  - Changed from `cachedPrice?.price` to `cachedPrice?.lowestPrice`
+  - Prices now properly retrieved from cache structure
+  - Location: `index.js:4107`
+
+- **Manual Portfolio Add**: Added missing user_steam_id field
+  - Items added manually now properly associated with Steam ID
+  - Fixes issue where manually added items wouldn't appear in portfolio
+  - Location: `index.js:1266-1280`
+
+- **Batch Portfolio Add**: Added missing user_steam_id field
+  - Batch added items now properly associated with Steam ID
+  - Location: `index.js:2141-2167`
+
+### Added
+- **Testing Suite**: Complete test coverage for all portfolio endpoints
+  - `test-portfolio-api.js`: Tests 14 portfolio endpoints
+  - `test-steam-endpoints.js`: Tests Steam inventory endpoints
+  - All tests passing ✅
+
+- **Feature Roadmap**: Comprehensive roadmap with 18 major features
+  - `ROADMAP.md`: Based on analysis of CS2SkinTracker and similar projects
+  - Organized by priority (P0-P3) and timeline (Q1-Q4 2025)
+  - Includes: Price alerts, analytics dashboard, CSV export, leaderboards, and more
+
+### Improved
+- **Steam Inventory Sync**: Added duplicate detection
+  - Prevents adding items that already exist in portfolio
+  - Auto-skips non-weapon items without wear values
+
+- **Error Logging**: Enhanced logging for inventory sync operations
+  - Better visibility into sync process
+  - Detailed error messages for failed items
+
+## [1.4.0] - 2025-10-XX
+
+### Added
+- Investment scoring algorithm
+- Float rarity detection
+- Pattern detection (Blue Gems, etc.)
+- Better Auth + Steam OAuth integration
+- Multi-market pricing (Buff163, Skinport, CSFloat, Steam)
+
+## [1.3.0] - 2025-09-XX
+
+### Added
+- Steam inventory integration
+- Inventory value calculation
+- Portfolio snapshots and history
+- CSV/JSON export
+
+## [1.2.0] - 2025-08-XX
+
+### Added
+- Better Auth integration
+- Realized vs unrealized profit tracking
+- Record sales (full and partial)
+- Batch operations
+
+## [1.1.0] - 2025-07-XX
+
+### Added
+- Float inspection (single and bulk)
+- Float ranking (top 1000)
+- Ownership history tracking
+- Sticker detection
+
+## [1.0.0] - 2025-06-XX
+
+### Added
+- Initial portfolio tracking
+- Add/Edit/Delete investments
+- Track purchase price, quantity, marketplace
+- Portfolio statistics (total invested, current value, ROI)
+- Price caching (5 min TTL)
+
+---
+
+## Testing Results (2025-11-01)
+
+All 14 portfolio endpoints tested and verified working:
+
+✅ POST /api/portfolio/add
+✅ GET /api/portfolio/:userId
+✅ GET /api/portfolio/stats/:userId
+✅ POST /api/portfolio/sale
+✅ DELETE /api/portfolio/delete/:investmentId
+✅ GET /api/portfolio/allocation/:userId
+✅ GET /api/portfolio/health/:userId
+✅ POST /api/portfolio/batch/add
+✅ GET /api/portfolio/activity/:userId
+✅ GET /api/portfolio/export/:userId
+✅ POST /api/portfolio/snapshot/create/:userId
+✅ GET /api/portfolio/snapshot/history/:userId
+✅ GET /api/portfolio/chart/:userId
+✅ GET /api/portfolio/pnl/:userId
+
+---
+
+## Known Issues
+
+### Low Priority
+- Price cache is empty for most items (requires population)
+- Authentication not enforced on all endpoints (security improvement needed)
+
+### Future Improvements
+See `ROADMAP.md` for planned features and improvements.
+
+---
+
+## Versioning
+
+This project follows [Semantic Versioning](https://semver.org/):
+- **MAJOR** version for incompatible API changes
+- **MINOR** version for new functionality (backwards compatible)
+- **PATCH** version for bug fixes (backwards compatible)