Live Supabase chat rooms + password reset flow

supabase/migration_v7_chat.sql

@@ -0,0 +1,57 @@
+-- Chat room membership RLS + DM room helper
+
+CREATE INDEX IF NOT EXISTS idx_rooms_spot ON public.chat_rooms (spot_id);
+
+DROP POLICY IF EXISTS "Members viewable by authenticated" ON public.chat_room_members;
+CREATE POLICY "Members viewable by authenticated"
+  ON public.chat_room_members FOR SELECT
+  USING (auth.role() = 'authenticated');
+
+DROP POLICY IF EXISTS "Users can join rooms" ON public.chat_room_members;
+CREATE POLICY "Users can join rooms"
+  ON public.chat_room_members FOR INSERT
+  WITH CHECK (auth.uid() = user_id);
+
+CREATE OR REPLACE FUNCTION public.get_or_create_dm_room(p_user_a UUID, p_user_b UUID)
+RETURNS UUID AS $$
+DECLARE
+  v_room_id UUID;
+  v_low UUID;
+  v_high UUID;
+BEGIN
+  IF p_user_a IS NULL OR p_user_b IS NULL OR p_user_a = p_user_b THEN
+    RAISE EXCEPTION 'Invalid DM participants';
+  END IF;
+
+  IF p_user_a < p_user_b THEN
+    v_low := p_user_a;
+    v_high := p_user_b;
+  ELSE
+    v_low := p_user_b;
+    v_high := p_user_a;
+  END IF;
+
+  SELECT cr.id INTO v_room_id
+  FROM public.chat_rooms cr
+  JOIN public.chat_room_members m1 ON m1.room_id = cr.id AND m1.user_id = v_low
+  JOIN public.chat_room_members m2 ON m2.room_id = cr.id AND m2.user_id = v_high
+  WHERE cr.type = 'dm'
+  LIMIT 1;
+
+  IF v_room_id IS NOT NULL THEN
+    RETURN v_room_id;
+  END IF;
+
+  INSERT INTO public.chat_rooms (name, type, created_by)
+  VALUES ('Private Chat', 'dm', p_user_a)
+  RETURNING id INTO v_room_id;
+
+  INSERT INTO public.chat_room_members (room_id, user_id)
+  VALUES (v_room_id, v_low), (v_room_id, v_high)
+  ON CONFLICT DO NOTHING;
+
+  RETURN v_room_id;
+END;
+$$ LANGUAGE plpgsql SECURITY DEFINER SET search_path = public;
+
+GRANT EXECUTE ON FUNCTION public.get_or_create_dm_room(UUID, UUID) TO authenticated;