public static bool IsOpponentOnCooldown(this UserArenaData data, ArenaOpponent opponent, long userId, int userLevel) => default;
public static ArenaLeagueId CalcLeagueId(this UserArenaData data, long userId, int userLevel) => default;
public static UserArenaData AddArenaPoints(this UserArenaData data, long arenaPoints) => default;
// Extension methods public static ArenaOpponent FindOpponent(this UserArenaData data, long userId, bool rated) => default;