- Move FRED credential registration to FastAPI lifespan (was fragile
import-order-dependent side-effect)
- Add noqa E402 annotations for imports after curl_cffi patch
- Fix all return type hints: bare dict -> dict[str, Any]
- Move yfinance import to module level (was inline in functions)
- Fix datetime.now() -> datetime.now(tz=timezone.utc) in openbb_service
- Add try/except error handling to Group B service functions
- Fix dict mutation in relative_rotation (immutable pattern)
- Extract _classify_rrg_quadrant helper function
- Fix type builtin shadow in routes_economy (type -> gdp_type)
- Fix falsy int guard (if year: -> if year is not None:)
- Remove user input echo from error messages
- Accept comma-separated symbols query param instead of single path param
- Move endpoint from /stock/{symbol}/technical/relative-rotation to
/technical/relative-rotation?symbols=AAPL,MSFT,GOOGL&benchmark=SPY
- Fetch all symbols + benchmark in single obb.equity.price.historical call
- Add RRG quadrant classification (Leading/Weakening/Lagging/Improving)
- Support study parameter (price/volume/volatility)
