-- name: CountOutboxByStatus :one
-- Operator overview "System" panel: the health of the integration delivery
-- queue in one round trip.
--
-- The three buckets mean different things to an operator and are therefore
-- reported separately rather than summed:
--   pending     — enqueued, not yet attempted or waiting on next_attempt_at.
--                 A steady non-zero value is normal.
--   failed      — attempted and errored, still inside max_attempts, so the
--                 poller will retry. In-flight, not lost.
--   dead_letter — exhausted its retries. Nothing will move this without an
--                 operator, so it is the only bucket that warrants an alarm.
--
-- Enqueue-side writes go through integration.Enqueue (internal/integration/
-- outbox.go); this is a read-only health probe over the same table.
SELECT
    COUNT(*) FILTER (WHERE status = 'pending')     AS pending_count,
    COUNT(*) FILTER (WHERE status = 'failed')      AS failed_count,
    COUNT(*) FILTER (WHERE status = 'dead_letter') AS dead_letter_count
FROM core.outbox;