1. Mass position deletion (portfolio.py): remove_position now rejects
empty position_id — previously position_id="" matched all positions
and deleted every holding for a ticker across ALL accounts.
2. Path traversal in get_recommendation (portfolio.py): added ticker/date
validation (no ".." or path separators) + resolved-path check against
RECOMMENDATIONS_DIR to prevent ../../etc/passwd attacks.
3. Path traversal in get_report_content (main.py): same ticker/date
validation + resolved-path check against get_results_dir().
4. china_data import stub (interface.py + new china_data.py): the actual
akshare implementation lives in web_dashboard/backend/china_data.py
(different package); tradingagents/dataflows/china_data.py was missing
entirely, so _china_data_available was always False. Added stub file
and AttributeError to the import exception handler so the module
gracefully degrades instead of silently hiding the missing vendor.
Magic numbers also extracted to named constants:
- MAX_RETRY_COUNT, RETRY_BASE_DELAY_SECS (main.py)
- MAX_CONCURRENT_YFINANCE_REQUESTS (portfolio.py)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
陈少杰