-- +goose Up
-- A per-seat snapshot of the player's display name, captured when the seat is taken:
-- the human's then-current display name, or a disguised robot's freshly composed
-- per-game name. Storing the name on the seat (rather than always reading the account)
-- freezes what the opponent sees for the life of the game — a later rename no longer
-- rewrites past games — and lets the small robot pool present an ever-changing crowd of
-- differently named opponents. An empty value means "no snapshot": the reader falls back
-- to the account's current display name (legacy rows / pre-migration games). See
-- docs/ARCHITECTURE.md §7.
SET search_path = backend, pg_catalog;

ALTER TABLE game_players ADD COLUMN display_name text NOT NULL DEFAULT '';

-- +goose Down
SET search_path = backend, pg_catalog;
ALTER TABLE game_players DROP COLUMN display_name;