Hey Christian! Let me explain how the deduping behavior works since this is pretty important to get right.
The system will actually keep the first values that come into the table - not the ones lower down in your view. So even though you've got it sorted by create date with newest at the top, that's just affecting how you're seeing the data, not how the deduping works.
If you want to remove the oldest entries, here's a better way to do it:
1. Create a formula to number your rows
2. Set up a filter to catch rows that were created before others and have a number greater than 1
Let me know how it goes!
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