- Added edge case test for `_find_col` in `tests/unit/test_ttm_analysis.py` (from PR #56).
- Enhanced `_clean_dataframe` in `tradingagents/dataflows/stockstats_utils.py` to parse dates, drop invalid rows, fill price gaps, and lowercase columns (combining PRs #58 and #60).
- Expanded the test suite in `tests/unit/test_stockstats_utils.py` to cover the new `_clean_dataframe` functionality.
Co-authored-by: aguzererler <6199053+aguzererler@users.noreply.github.com>
Added tests to verify the dataframe cleaning logic in stockstats_utils.
Tests cover lowercasing of columns, handling non-string columns, and ensuring original dataframe is not mutated.
Co-authored-by: aguzererler <6199053+aguzererler@users.noreply.github.com>