I came across that ‘data_previous’ and ‘data_timestamp’ values of a DataTable are not assigned unless the user edits DataTable explicitly. If the DataTable is edited by a callback, it’s ‘data_previous’ and 'data_timestamp ’ remain the same. I understood from the documentation that these properties should change if the data is modified by a callback.
My original table is created inside a callback. I have also tried to set data_previous explicitly when the table is created, but it didn’t help either.
I’m using a bit obsolete setup though, is this changed in the recent versions?