-- Links a spelling quiz question row to the selected catalog item at tile load.

CREATE TABLE IF NOT EXISTS spelling_question_links (
  question_id       UUID PRIMARY KEY REFERENCES questions (id) ON DELETE CASCADE,
  firebase_uid      TEXT NOT NULL REFERENCES users (firebase_uid) ON DELETE CASCADE,
  spelling_item_id  UUID NOT NULL REFERENCES spelling_items (id) ON DELETE CASCADE,
  linked_at         TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS spelling_question_links_uid_idx
  ON spelling_question_links (firebase_uid);

CREATE INDEX IF NOT EXISTS spelling_question_links_item_idx
  ON spelling_question_links (spelling_item_id);