BEGIN;

ALTER TABLE hardware_agent_device_binding
    ADD COLUMN minimum_sdk_version varchar(80);

ALTER TABLE hardware_agent_session
    ADD COLUMN sdk_version varchar(80) NOT NULL DEFAULT 'unknown',
    ADD COLUMN capability_snapshot jsonb NOT NULL DEFAULT '{}'::jsonb,
    ADD COLUMN provider_connection_ref varchar(200),
    ADD COLUMN dynamic_config_applied_at timestamptz;

COMMENT ON COLUMN hardware_agent_device_binding.minimum_sdk_version IS
    'Minimum Volcengine hardware-agent SDK version accepted for new sessions.';
COMMENT ON COLUMN hardware_agent_session.capability_snapshot IS
    'Immutable device capability declaration used for privacy and runtime admission decisions.';

COMMIT;