The previous implementation redirected sys.stderr to /dev/null using a
context manager. This is not thread-safe: 8 concurrent scanner threads each
mutate sys.stderr, and when one thread's context manager closes the devnull
file, another thread that captured devnull as its saved stderr attempts to
write to the closed fd and raises "I/O operation on closed file".
This corrupted sys.stderr state caused _fetch_batch_prices to fail and
all per-ticker get_stock_price fallback calls to return None, resulting in
every candidate being dropped with "no data available".
Fix by suppressing at the Python logging level instead of redirecting
sys.stderr. Logger.setLevel() is protected by internal locks and is safe
to call from concurrent threads.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The same-day mover filter used abs() to check intraday movement, which
filtered both gap-ups AND gap-downs. On volatile/crash days (e.g. 2026-04-07)
all stocks dropped >10% from open, causing every candidate to be filtered and
leaving zero recommendations.
The filter's purpose is to avoid chasing stocks that already ran up. A stock
down 20% intraday is not "stale" — it should be evaluated on its merits.
Changed threshold check from abs(pct) >= threshold to pct >= threshold so only
upside movers are filtered.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Major additions:
- ML win probability scanner: scans ticker universe using trained
LightGBM/TabPFN model, surfaces candidates with P(WIN) above threshold
- 30-feature engineering pipeline (20 base + 10 interaction features)
computed from OHLCV data via stockstats + pandas
- Triple-barrier labeling for training data generation
- Dataset builder and training script with calibration analysis
- Discovery enrichment: confluence scoring, short interest extraction,
earnings estimates, options signal normalization, quant pre-score
- Configurable prompt logging (log_prompts_console flag)
- Enhanced ranker investment thesis (4-6 sentence reasoning)
- Typed DiscoveryConfig dataclass for all discovery settings
- Console price charts for visual ticker analysis
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Youssef Aitousarrah
Edward Sun
luohy15