Get inserted_at value from first inserted item

[SimonLab]

When retrieving item (with the functions get or all for example) the inserted_at and updated_at value will always be the same as a new item is inserted on update.

So the inserted_at doesn't represent the value of the first inserted item. Should we update this value to match the first inserted_at item?

@Danwhy @nelsonic any thought on this?