- Fix BacktestPageRunResult serialization in jobs.py to correctly access
nested fields from scenario and run_result objects
- Add test_backtest_job.py with comprehensive tests for job execution
- Add conftest_playwright.py with ServerManager that starts FastAPI server
for Playwright tests using uvicorn
- Add test_playwright_server.py with E2E tests using the server fixture
The job serialization bug was causing backtest results to fail silently
because it was trying to access non-existent fields on BacktestPageRunResult.
BREAKING CHANGE: Complete redesign of backtest execution
- Add BacktestJob system with progress stages (validating, fetching_prices, calculating)
- Run backtests in background threads, UI polls for status
- Show progress label with current stage during execution
- Remove synchronous Databento API calls from page load
- Use static default entry spot for initial render (defers API call)
- Make refresh_workspace_seeded_units async with run.io_bound
This fixes:
- 'Connection lost' WebSocket timeout errors
- Slow page load (30s initial load)
- Backtest never completing
The job system provides:
- Non-blocking execution
- Progress tracking with stages
- Error handling with user-friendly messages
- Result caching for retrieval after completion
