automatical deletion of persistence history file

[Pythonaire]

If i'm right, uploading the data to the EVE app/homekit is triggered by the user action.
Using persistent storing in parallel can produce large files. I would like to delete these persistent storage files after uploading the containing data to the homekit automatically.
How can i see in the code: "ok, all data are uploaded, the persistent data file is no longer needed."?
I tried "this.currentEntry > this.lastEntry" as a trigger to call the remove function, but without luck.

Thx