Firebase : How to check if a User ID already Exist

I have made a review system so that users can post reviews about my products in my app, and I have used Firebase to store User ID.

The User ID is a bucket and it contains name and tags of differnt products, shown below


But the reviews are stored in Airtable and called from there, I am trying that 1 user must post one review, how to check if User ID already exist in firebase, or how to check the Bucket with “User ID” is already created

First grab the tags and compare with the username

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but the User Id is the bucket, it is not a tag

this screenshot will be helpful


can you try please?

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the blocks i upload. if it is in tag then also & if it in value then also you can get…

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