Are there any decent strategies to prevent sending the same message to the
queue twice?

Say for example it’s a money transfer … if you initiate the transfer twice
you’d transfer too much money.  If you have an algorithm that retries you
would want it to NOT enqueue the message transfer message again because
it’s already pending.

And additionally, how would this be done with delayed messages?   This is
more of a fake queue so browsing the main queue wouldn’t show the messages
in the delayed queue.

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