-- Add draft/published state to chapters and lessons.
-- Existing content is published immediately so nothing goes dark on deploy.
-- New lessons created via the admin API default to is_published = false (draft).

ALTER TABLE lessons  ADD COLUMN IF NOT EXISTS is_published BOOLEAN NOT NULL DEFAULT false;
ALTER TABLE chapters ADD COLUMN IF NOT EXISTS is_published BOOLEAN NOT NULL DEFAULT false;

UPDATE lessons  SET is_published = true;
UPDATE chapters SET is_published = true;