Fix the problem of abnormal values of item key and created at in item attributes #4421
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Fix the problem that when importing items via csv, the value of item_key is -1 and the value of created_at is null, make sure the item_key is unique, when it is -1, no abnormality is found in the process of using it to avoid unknown problems, fix it.
When copying an item, the item_key and created_at of the newly generated item still use the attributes of the copied item.