How to avoid re-execution

Hi, I want to create a KNIME workflow where I import monthly data, process it, and then append the results to a CSV file. However, if the workflow is accidentally executed again, I need to prevent duplicate entries if the workflow is executed more than once. Is there a way to achieve this in KNIME?
Thank you.

You can try the Duplicate Row Filter depending on what your data looks like.

Duplicate Row Filter – KNIME Community Hub.

Or use the Joiner node

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