Expand description
agents enqueue — fire-and-forget into the queue.
Bypasses the lock race and spawn child entirely (that’s agents message); writes one row into message_queue against the
target. With --key, db::message_queue::enqueue_with_content
replaces any prior active row scoped to the same (target, key)
pair before insert, so re-issuing with the same key reliably
replaces the prior payload. Refs have no queue identity — error.
Tags need NOT exist yet: the row is parked against the tag NAME
whether or not the tag is registered, and the queue’s two-rule read
predicate resolves it once the tag binds to an agent that reads
(park-now, deliver-on-bind). A tag that never binds simply leaves
the row unconsumed.