- Enhanced the `merge_column_backed_and_eav_metrics` function to ensure that when both legacy columns and EAV values are present, the legacy column takes precedence.
- Revised documentation in `ACTIVITY_PRODUCTION_ARCHITECTURE_AND_PHASES.md` and `ACTIVITY_SCALAR_KANON_TABLE.md` to reflect the new reading logic and clarify the handling of metrics.
- Updated the `activity_data_canon.py` to specify the new merge behavior, ensuring consistency in data retrieval.
- Added unit tests to validate the new logic, confirming that legacy columns are preferred when available.