\c dcntrlized;

-- 004_drop_auto_stop.sql — remove the auto-stop window.
--
-- Contract decision (2026-10-18, user ruling): an alert is active from trigger
-- until the owner disarms it. There is no clock-based expiry: "if an owner
-- triggers it and then loses their phone, the alarm should go off until the
-- client dismisses it, with no autostop". A subscriber's ringing ends when that
-- subscriber dismisses locally; the server does not expire the event, and the
-- server-side state does not depend on any client's cooperation.
--
-- Consequence, accepted and documented in API.md: an alert that is never
-- disarmed stays active forever, and only the owner's admin token can end it.
--
-- `alerts.auto_stop_seconds` and its CHECK constraint
-- (alerts_auto_stop_seconds_range) have no remaining reader: `active` is simply
-- `status = 'triggered'` now. `001_alarm_schema.sql` is already applied and is
-- never edited in place, so the column is dropped here; a fresh database creates
-- it in 001 and drops it in this file, keeping the history append-only.
--
-- Idempotent: guarded on the schema existing and DROP COLUMN IF EXISTS, so a
-- re-apply of the whole sequence is a clean no-op (same pattern as 002/003).

-- The fan-out trigger reads the alert row when it builds its pg_notify payload,
-- so it is replaced BEFORE the column goes: leaving the old body behind would
-- make every event INSERT fail with "column auto_stop_seconds does not exist"
-- once the column is gone. The payload is the WS frame's transport form; with no
-- auto-stop it carries alertId/eventId/action/message/createdAtMs and nothing
-- else. CREATE OR REPLACE is idempotent.
CREATE OR REPLACE FUNCTION alarm.notify_alarm_event()
RETURNS TRIGGER AS $$
BEGIN
    PERFORM pg_notify('alarm_events', json_build_object(
        'alertId', NEW.alert_id::text,
        'eventId', NEW.id::text,
        'action', NEW.kind::text,
        'message', COALESCE(NEW.message, ''),
        'createdAtMs', (EXTRACT(EPOCH FROM NEW.created_at) * 1000)::bigint
    )::text);

    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM pg_namespace WHERE nspname = 'alarm') THEN
        ALTER TABLE alarm.alerts DROP COLUMN IF EXISTS auto_stop_seconds;
    END IF;
END
$$;