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Hi Cell2749,
Thanks for reaching out. For your question, I would recommend you to use a standard sql alias, such as "item-id" or "id". Also, you can use AWS IoT DynamoDBv2 Action to write all or part of an MQTT message to a DynamoDB table. Each attribute in the payload is written to a separate column in the DynamoDB database. Reference (https://docs.aws.amazon.com/iot/latest/developerguide/iot-rule-actions.html#dynamodb-v2-rule)
I am interested in learning a bit more about your use cases for including hyphen as a requirement as well.
Hope this helps!
Thanks,
Ningwei
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