How do I configure idempotency with Redis backend in aws_lambda_powertools?

[sudsali]

Looking for guidance on using @idempotent with Redis as the persistence layer.

Specifically:

1. What's the recommended Redis cluster mode (standalone vs cluster)?
2. Where do I configure the connection string?
3. Are there examples in the docs?

Pointer to relevant docs/examples would be great. Thanks!

[github-actions]

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