Firestore is a NoSQL document store database.
One too many, though, and I’d hit the read or write limit of the plan, which sometimes could happen within an hour or two.
There is an exists test for documents, but not for document fields.
This means that if any write operation fails, then all writes fail, and the database data retains its original state.
It is better to fetch a subset of the first collection, then iterate through it document by document.

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