I somehow figured it out and my recipe is not downloading any article twice any more.
There is only one more thing:
I have set remove_empty_feeds = True in order to not send old articles again.
Now, given there are no new articles in the feed, this setting raises an error: ValueError: No articles found, aborting
This is not particular severe, since following tasks are still evaluated. However, is there any way to suppress the error message?
Thank you and sorry for anoying.
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