Both issues are fixed.

Catalog drag-drop: Dragging a non-PK column from the SQL catalog browser now creates source mappings for both roles of the resulting binary fact type. The entity-side role receives the full path through the primary key; the value-side role receives the path to the dragged column. The New Entity wizard also gains an optional 'Create source mapping for roles' checkbox (unchecked by default). The source system label in the Live Data tab was corrected from 'Data Mapping' to 'Source system'. A catalog/schema ordering bug in the source path builder was also fixed.

Population editor: The empty grid no longer allows direct cell editing — Add must be pressed first to create a row. Pasting CSV into an empty population set now correctly positions the cursor on the first imported row and enables editing state after the import.