Legacy CMS Data stores datasets whose shapes come from a separate legacy Model file. It remains for old projects; use typed Content for new work.
Property: Identity · Current behavior: untyped file below cms/data/
Property: Visibility · Current behavior: hidden and unavailable for current UI creation
Property: Workspace · Current behavior: legacy dataset/row editor
Property: Features · Current behavior: dataset add/delete; row add/edit/reorder/delete
Property: MCP · Current behavior: get-cms, legacy dataset and row operations
Property: Status · Current behavior: compatibility only
The referenced Model file and model ID must exist for rows to resolve. Dataset definitions and values persist; content changes can be offered to Preview through Update rather than forcibly resetting every current session.
Do not create new legacy data or rewrite rows into a guessed modern schema. Plan and verify any migration together with its Model definitions.