Hi Andreas,
Iām sorry to hear about the trouble youāre experiencing. Can you confirm if this file is from Clay and whether it includes the ācreated atā or āupdated atā column?
If not already done, please try uploading the file to Google Sheets, re-exporting it as a CSV, and then uploading it to Clay.
If that doesnāt resolve the issue, could you share the Google Sheets Public URL with us? Iāll be happy to take a closer look. Let me know if you need further assistance!