-- +goose Up
-- Dual-path VRRP + Gateway-Tracking für Split-Brain-Schutz.
-- hb_* = zweite VRRP-Instanz (VI_HB) auf dediziertem Heartbeat-Interface.
-- gw_check_ip = Gateway-IP die von chk_gateway angepingt wird (weight -110).
ALTER TABLE cluster_settings
  ADD COLUMN IF NOT EXISTS hb_interface  VARCHAR,
  ADD COLUMN IF NOT EXISTS hb_src_ip     VARCHAR,
  ADD COLUMN IF NOT EXISTS hb_peer_ip    VARCHAR,
  ADD COLUMN IF NOT EXISTS hb_router_id  INTEGER NOT NULL DEFAULT 52,
  ADD COLUMN IF NOT EXISTS gw_check_ip   VARCHAR;

-- +goose Down
ALTER TABLE cluster_settings
  DROP COLUMN IF EXISTS hb_interface,
  DROP COLUMN IF EXISTS hb_src_ip,
  DROP COLUMN IF EXISTS hb_peer_ip,
  DROP COLUMN IF EXISTS hb_router_id,
  DROP COLUMN IF EXISTS gw_check_ip;