database.md

Database setup (Supabase)

The site uses Supabase to store P(doom) submissions.

1. Create a Supabase project

1. Go to supabase.com and create a free project.
2. Copy the Project URL and anon public key from Settings > API.
3. Paste them into _data/supabase.yml:

url: "https://YOUR_PROJECT.supabase.co"
anon_key: "YOUR_ANON_KEY"

2. Create the submissions table

Open the SQL Editor in the Supabase dashboard and run:

CREATE TABLE submissions (
  id bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  submitted_at timestamptz NOT NULL DEFAULT now(),
  factors jsonb,
  summary jsonb,
  quiz_flow_id text,
  quiz_answers jsonb
);

3. Grant Data API access

As of May 30, 2026, new Supabase projects no longer expose public tables to the Data API by default. Grant access explicitly so the anon key (used by supabase-js) can reach the table:

GRANT SELECT, INSERT ON submissions TO anon;

Without this, PostgREST returns a 42501 error.

4. Enable Row Level Security (RLS)

RLS is required for the anon key to work. Enable it on the table, then add policies for anonymous insert and read access:

ALTER TABLE submissions ENABLE ROW LEVEL SECURITY;

-- Allow anyone to submit predictions
CREATE POLICY "Allow anonymous inserts"
  ON submissions FOR INSERT TO anon
  WITH CHECK (true);

-- Allow anyone to read submissions (needed for the stats page)
CREATE POLICY "Allow anonymous reads"
  ON submissions FOR SELECT TO anon
  USING (true);

Column reference

Column	Type	Description
id	bigint	Auto-incrementing primary key
submitted_at	timestamptz	When the prediction was registered
factors	jsonb	Array of {key, label, lower, upper, midpoint, spread} per stage
summary	jsonb	{lower, upper, midpoint, p10, p90} — the combined P(doom) result
quiz_flow_id	text	Which quiz path was taken: decide, beginner, medium, expert, or null if skipped
quiz_answers	jsonb	Array of {question_id, type, value/values} — the user's quiz selections