Bu5hm4nn 27ade507cd feat(backtest): async job queue for non-blocking backtest execution ...

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

2026-04-01 09:31:53 +02:00

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