Managing the data retention for an evenstream

Hi,

I'm testing an eventstream with an Azure Event Hubs as a source.

During this project phase it occurs to change whatever about the composition of the input events: a column to add or remove, a column type to change, a column value to modify and so on.

For each source change it occurs to get again the source events in the eventstream and I'd like to clear the previous loaded data in spite of the minimum retention setting, without removing and creating again the eventstream source.

Any suggests to me in order to accomplish a such task, please? Thanks