Run this SQL in your Supabase dashboard → SQL Editor to create the storage table:

-- Run once in Supabase SQL Editor
CREATE TABLE IF NOT EXISTS public.circulars (
  id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  circular_name text NOT NULL,
  total_jobs integer NOT NULL,
  chunk_index integer NOT NULL DEFAULT 0,
  total_chunks integer NOT NULL DEFAULT 1,
  jobs_json jsonb NOT NULL,
  saved_at timestamptz DEFAULT now()
);

-- Allow anyone to read (public app)
ALTER TABLE public.circulars ENABLE ROW LEVEL SECURITY;
CREATE POLICY "public read" ON public.circulars FOR SELECT USING (true);
CREATE POLICY "public insert" ON public.circulars FOR INSERT WITH CHECK (true);
CREATE POLICY "public delete" ON public.circulars FOR DELETE USING (true);