// The deck a presentation actually is.
//
// Markdown stays the readable artifact — it is what Word renders and what a
// text edit edits — but it cannot express a two-column comparison, a callout, or
// a figure placed beside its bullets, so a deck round-tripped through markdown
// loses the layout the model chose. Storing the deck keeps those choices, and
// the markdown is serialised from it.
//
// Null for an article, and for every presentation written before this existed;
// those still render from their markdown.

exports.up = pgm => pgm.sql(`
  ALTER TABLE user_resources ADD COLUMN IF NOT EXISTS deck JSONB;
`);

exports.down = pgm => pgm.sql(`
  ALTER TABLE user_resources DROP COLUMN IF EXISTS deck;
`);