You can use a database. Practically, most systems will keep a record of each mes... | Hacker News

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		jongjong on March 2, 2023 \| parent \| context \| favorite \| on: You cannot have exactly-once delivery (2015) You can use a database. Practically, most systems will keep a record of each message on disk in any case (at least they will have some logs) so it's not that outrageous. Safe to assume that the receiver can discard non-authenticated messages to avoid spam.

datadata on March 4, 2023 [–]

It depends entirely on volume of messages vs available memory (ram or disk) how outrageous it is

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