I've started defining the bits necessary for storing push subscriptions: see https://github.com/cyrusimap/cyrus-imapd/commit/7144a747267cb968c90128d0d6b4c24199

I've started defining the bits necessary for storing push subscriptions: see https://github.com/cyrusimap/cyrus-imapd/commit/7144a747267cb968c90128d0d6b4c24199c0ca2e https://github.com/cyrusimap/cyrus-imapd/commit/7144a747267c... But it's rudimentary - it will need sql_db and dblookup components to make it fast enough to integrate with an mboxevent reading component to do the actual pushes. At least - that's how we'll probably implement it at Fastmail, and there's a plan to extract the key parts of our non-blocking push daemon and lift them up into the Cyrus project.