281b7e30ba
Two root causes in the logs: 1. fetch_forward_curves() tried 5 offsets × 8 commodities = 40 individual yfinance requests for monthly contracts (CLN26, GCQ26, etc.) that Yahoo Finance does not support — generating ERROR storm and triggering hard rate limiting that cascades onto front-month CL=F/GC=F calls used by the main cycle. 2. Ticker format lacked exchange suffix (.NYM/.CMX/.CBT). Fix: replace the per-ticker loop with two batch yfinance.download() calls (one for all 8 front-months, one for all deferred candidates). Failed deferred lookups are logged at DEBUG level and reported as structure='unknown' rather than ERROR, since Yahoo Finance does not expose monthly commodity contracts reliably. Added 1s sleep between batches to avoid rate spiking. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>