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DynamoDB does not provide the ability to ROLLBACK
a transaction like you would do on a relational system. However, it does provide Transactional API's which allow for ACID compliance. You can submit batches of up to 100 items as a single request and ensure that wither all requests succeed or none at all.
For your use-case you may be able to make use of version control: https://aws.amazon.com/blogs/database/implementing-version-control-using-amazon-dynamodb/
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