-- The bus seat's holder answers for the mesh's bus, not for a wire protocol (novox/hq ADR 0131).
--
-- The row said `amqp`, which is the protocol the old broker spoke, and so only that broker could hold
-- the seat that names the mesh's bus — while the module that will carry the bus could not. The seat
-- delivers `mesh-bus`; whichever module provides that may hold it, and today that is one module.
--
-- Safe under the current holder: the control plane composes its own bus address through the seat by
-- name, and the overview derives holders by name. Only registration and provision-to-seat resolution
-- read this column. So the row changes, the current holder keeps holding by derivation, the next one
-- can register its claim, and the handover (0039) moves the seat when both are running. What must
-- not happen in between is re-registering the current holder — registration would now refuse it.
update seat set delivers = 'mesh-bus' where name = 'mesh-broker' and delivers = 'amqp';