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I made a mistake of using set() instead of update and it overwrote the entire collection.

2

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  1. Programmatically, no. There is also no manual process you can control by default. You would have to establish a backup process ahead of time, and restore from the backup.

    See also:

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  2. firebaser here

    As Doug said, there is no API to restore data that you overwrite or deleted.

    If you accidentally overwrite data in the Realtime Database, immediately reach out to Firebase support for personalized help in troubleshooting. They may be able to help restore the data from a backup.

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