exists
Returns true when a row already exists for the (eventId, consumerGroup) pair. Primarily useful for diagnostics — the ProcessedEventGuard relies on the UNIQUE-constraint violation from insert for the race-free idempotency check.
Returns true when a row already exists for the (eventId, consumerGroup) pair. Primarily useful for diagnostics — the ProcessedEventGuard relies on the UNIQUE-constraint violation from insert for the race-free idempotency check.