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Date: Mon, 25 Sep 2023 21:02:21 +0000
From: Eric Wong <e@80x24.org>
To: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Cc: meta@public-inbox.org
Subject: Re: pop3: does uuid need to be unique for all mailboxes?
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References: <20230925-wagon-affidavit-2f2df1@meerkat>
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Konstantin Ryabitsev <konstantin@linuxfoundation.org> wrote:
> Hopefully an easy question:
> 
> If I'm subscribing to two different mailboxes via pop3, does the uuid part
> need to be unique for each mailbox?

Nope, you can reuse UUID across different mailboxes.

> For example, will the following cause any
> problems because the uuid is the same?
> 
> - 2db99975-4977-4866-8819-d7fbbf0f9cb4@org.kernel.vger.netdev?initial_limit=10
> - 2db99975-4977-4866-8819-d7fbbf0f9cb4@org.kernel.vger.bpf?initial_limit=10

No problems, it's totally fine to recommend that since it saves
small amount of storage and will speed up expiry[1]

FWIW, the DB schema is in the create_state_tables() sub of
lib/PublicInbox/POP3D.pm and hopefully easily understandable
even to non-Perl hackers.


[1] of course, there's hardly any users, so I'm not sure it matters