-- 20260510000000_demo_config.sql
--
-- Kill switch for the demo chat endpoint. Backs the budget-alert Cloud Function
-- that flips demo_enabled to 'false' when GCP spend crosses 90% of the daily
-- budget threshold. The web tier polls this table with a 60s TTL cache so the
-- demo is disabled within one minute of a budget alert firing.
--
-- Service-role bypasses RLS. Public anon has no access (policy USING (false)).

CREATE TABLE IF NOT EXISTS public.demo_config (
    key        text         PRIMARY KEY,
    value      text         NOT NULL,
    updated_at timestamptz  DEFAULT now()
);

ALTER TABLE public.demo_config ENABLE ROW LEVEL SECURITY;

CREATE POLICY "service only" ON public.demo_config USING (false);

-- Seed the kill switch as enabled
INSERT INTO public.demo_config (key, value) VALUES ('demo_enabled', 'true')
    ON CONFLICT (key) DO NOTHING;
