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javascript - how to Retrieve firebase database start from bottom to up?

I have a set of items in firebase realtime, when i Retrieve data the old data appears at the first. Already i tried

    Firebase.database().ref().child('chains').orderByKey().startAt();
  • but the data didn't appear

I want upload new item and it appear at the first how do i do this?

this my code:

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this my database

enter image description here

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