When CaseTalk transforms a model (grouping, lexicalising, or reducing fact types), column-to-source mappings defined on roles can become stale or lost.

These mappings are used to link model elements to source systems — for example, to generate dbt source definitions or data lineage documentation. If the model is restructured and the mapping metadata is not updated accordingly, the catalog connection is silently broken: generated outputs will reference roles that no longer exist, or miss roles that have been moved or merged.

CaseTalk should keep catalog mappings in sync during all model transformations, including:

• When a role is moved to another fact type
• When a role is removed during reduction
• When roles are merged or substituted during grouping or lexicalising

This ensures that source system references remain accurate after GLR processing, and that downstream artifacts (such as dbt sources or data lineage exports) continue to reflect the actual model structure.