Save only changed value when editing datatable

Is it possible to send data with only id and changed column value in editable datatable, not the whole row?

Yes. You can change the $save key in the data scheme.

I would be interested to learn more. How do I know what cell changed?

Maksim provided this direction:
https://forum.webix.com/discussion/2606/editable-datatable-the-simplest-way-to-submit-changed-value-only

Hello @klompenrunner,

How do I know what cell changed?

The onAfterEditStop takes 3 parameters: state, editor, ignoreUpdate.The editor parameter stores information about the current row/column of the cell that is being changed:
https://snippet.webix.com/2vihvyn3