async fn adjust_delete_server_after(context: &Context) -> Result<()>Expand description
Sets Config::DeleteServerAfter to “never” if needed so that new messages are present on the
server after a backup restoration or available for all devices in multi-device case.
NB: Calling this after a backup import isn’t reliable as we can crash in between, but this is a
problem only for old backups, new backups already have DeleteServerAfter set if necessary.