Validates trading day count, benchmark coverage, per-date ticker
density, and date gaps before running simulation. Logs warnings for
holdings with missing prices during execution.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- VirtualPortfolio for portfolio simulation
- BacktestEngine for strategy backtesting
- Worker for async background execution
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>