Version history, sharing & collaboration

Every study keeps a revision timeline you can snapshot and diff (with a CSV export of exactly what changed across nodes), plus sharing with teammates, a notification feed for shares/edits/locks, and live WebSocket co-editing — change control and teamwork layered over the worksheet.

• Documenting what changed between two points in a study's life for a management-of-change record.
• Multiple engineers need to work the same study at the same time without overwriting each other.
• Handing a study to a colleague or a reviewer and tracking who has access.

Diffing two snapshots walks every node's payload and reports field-level changes; live co-editing broadcasts row-level changes over a WebSocket connection so concurrent editors see each other's edits without a manual refresh.