- Add pykrx-openapi dependency
- New krx_client.py wrapper module
- ETFCollector: Open API bulk fetch + pykrx fallback
- ETFPriceCollector: Open API date-based bulk + pykrx fallback
- StockCollector: Open API base_info + daily_trade + pykrx fallback
- PriceCollector: Open API date-based bulk + pykrx fallback
- ValuationCollector: pykrx retained (Open API has no PER/PBR)
- generate_snapshots.py: Open API + pykrx fallback
- Auto-switch based on KRX_OPENAPI_KEY env var
- All 278 tests passing
- Remove hardcoded database_url/jwt_secret defaults, require env vars
- Add DB indexes for stocks.market, market_cap, backtests.user_id
- Optimize backtest engine: preload all prices, move stock_names out of loop
- Fix backtest API auth: filter by user_id at query level (6 endpoints)
- Add manual transaction entry modal on portfolio detail page
- Replace console.error with toast.error in signals, backtest, data explorer
- Add backtest delete button with confirmation dialog
- Replace simulated sine chart with real snapshot data
- Add strategy-to-portfolio apply flow with dialog
- Add DC pension risk asset ratio >70% warning on rebalance page
- Add backtest comparison page with metrics table and overlay chart
