Inside C:\Users/{YOUR USERNAME}\AppData\Local\BraveSoftware is where Brave stores this data locally.
Perhaps it’s time to consider making backups in the future.
Remember, backups are your friend. Keep backups local on a usb-drive in a safe place. DON’T UPLOAD IT TO A CLOUD.
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NOTE *
Perhaps @Mattches can help you get it back, however. I am not an employee here. Just a friendly bystander.
Hopefully this assisted you.
-AASB