Felipe Contreras <felipe.contreras@gmail.com> writes:

> On Mon, Apr 3, 2023 at 6:37 PM David Bremner <david@tethera.net> wrote:

> Or we could say that after jumping a certain threshold of lastmod we
> delete all the messages and start from scratch, perhaps every 1000
> revisions.
>
> Or maybe the query could generate a virtual tag if a message was
> deleted since the previous lastmod (e.g. "nm::deleted"). Then it would
> be trivial for the remote helper to tell that to git.

A complication here is that tags be attached to mail message documents
in the database, so we would need to generate a so called "ghost
message", and clean those up somehow.

> I lean towards the threshold, because that way the user doesn't need
> to do anything, and there's no modifications needed in libnotmuch.

This sounds right. Can we use the detection of missing messages in
wr_export to reset the appropriate counters? It looks like yes, given
the call to store_lastmod.
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