The data viewers/grids are automatically synched with the local table, you only need to update the local table or if you rather prefer update the data Viewer/grid rows directly.
I was talking about the data in my backend.
the app can be used in different devices also.
The data are accessible based on the device so if different users used the same device I will need make sure that the data are for the good user right ?
If you clear the data in the local table whenever the app starts then you should not worry about user specific data because the data that will show in the Data Viewer List/Grid will be the data you extracted from the external source regardless of the device used.