-- The "Эрудит" no-repeat-words rule: a word laid on the board cannot be laid again. It is pinned
-- per game rather than derived from the variant, because a game is replayed from its journal on
-- every open — a rule applied retroactively would make an already-played repeat illegal (voiding
-- the game) and would rescore a play whose cross-word repeats an earlier word. Every existing game
-- therefore keeps the unrestricted rule (DEFAULT false, no backfill) and only new erudit_ru games
-- are created with it on. Additive column — applies forward via goose with no data rewrite (no
-- contour wipe); an image rollback ignores the column.
-- +goose Up

ALTER TABLE backend.games ADD COLUMN no_repeat_words boolean NOT NULL DEFAULT false;

-- +goose Down

ALTER TABLE backend.games DROP COLUMN no_repeat_words;