Create a free project at supabase.com, then open the SQL Editor and run this SQL:

CREATE TABLE IF NOT EXISTS players (
  id bigint generated always as identity primary key,
  created_at timestamptz default now(),
  first text not null,
  last text not null,
  phone text not null,
  gender text not null,
  dupr numeric not null,
  dupr_id text,
  categories text[],
  notes text
);
ALTER TABLE players ENABLE ROW LEVEL SECURITY;
CREATE POLICY "read" ON players FOR SELECT USING (true);
CREATE POLICY "insert" ON players FOR INSERT WITH CHECK (true);
CREATE POLICY "delete" ON players FOR DELETE USING (true);

CREATE TABLE IF NOT EXISTS tournament (
  id int primary key default 1,
  name text, start_date date, end_date date,
  location text, categories text[]
);
INSERT INTO tournament(id) VALUES(1) ON CONFLICT DO NOTHING;
ALTER TABLE tournament ENABLE ROW LEVEL SECURITY;
CREATE POLICY "read t" ON tournament FOR SELECT USING (true);
CREATE POLICY "update t" ON tournament FOR UPDATE USING (true);

Go to Project Settings → API. Copy your Project URL and anon public key and paste below, then click Connect.