- ETFCollector: retry once on JSONDecodeError/ConnectionError with 3s delay
- ValuationCollector: fallback to previous 3 business days on KeyError/empty data
- Both: graceful skip on persistent failure, never delete existing DB data
- Add test_collector_resilience.py (9 tests)
- Add WalkForwardResult model with train/test window metrics
- Create WalkForwardEngine that reuses existing BacktestEngine
with rolling train/test window splits
- Add POST/GET /api/backtest/{id}/walkforward endpoints
- Add Walk-forward tab to backtest detail page with parameter
controls, cumulative return chart, and window results table
- Add Alembic migration for walkforward_results table
- Add 8 unit tests for window generation logic (100 total passed)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Port make-quant-py's FnGuide scraping logic into galaxy-po's
BaseCollector pattern. Collects annual and quarterly financial
statements (revenue, net income, total assets, etc.) and maps
Korean account names to English keys for FactorCalculator.
Scheduled weekly on Monday 19:00 KST since data updates quarterly.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
