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From: =?utf-8?Q?G=C4=B3s_Hillenius?= <gijs@hillenius.net>
To: David Rogers <davidandrewrogers@gmail.com>
Cc: Gnus list <ding@gnus.org>
Subject: Re: I want to expire some even if unread
Organization: Using Emacs' Org Mode
References: <s0ebllnkdio.fsf@gmail.com>
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Date: Sat, 13 Jun 2020 09:19:11 +0200
In-Reply-To: <s0ebllnkdio.fsf@gmail.com> (David Rogers's message of "Fri, 12
	Jun 2020 17:36:31 -0700")
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On 12 June 2020 17:36 David Rogers, wrote:

> Hello all
>
> I'm looking for a way, just on certain groups, to expire messages
> based ONLY on the fact that they're old, regardless of whether 
> they're read or not. I won't remember to activate a special switch
> every x weeks or whatever, so I'm looking for something I can "set 
> and forget". Perhaps this type of setup is considered too likely to
> cause unexpected data loss, but if I lose these particular groups by
> accident it won't really matter.
>
> Automatic catch-up to a certain point, maybe? I'm having a hard time
> finding information on this.
>
> It would be a nice bonus if ticked messages were kept, but I'd rather
> lose a few ticked messages than have no automatic expiry.

have you tried

gnus-auto-expirable-newsgroups

?