Test::PgMonger, which you should probably not use
JMAP is a protocol that is meant to replace IMAP, CalDAV, CardDAV, SMTP, ACAP (ha ha), and probably some other protocols that aren’t springing to mind. Like IMAP, it’s meant to make it easy to synchronize offline work with an authoritative server. It does this by dividing up the data model into collections of discrete types, with each collection in a known and addressable state.