Trim the Tree

Normal sudoku and fog rules apply. Cells a chess knight's move apart must contain different digits. All lines in the puzzle, regardless of color, are modular. (Any set of three contiguous digits along the line contains one each of {147}, {258}, {369}.) Digits on either side of a red baubles are in a 1:3 ratio. Digits on either side of gold baubles are in a 1:2 ratio. Not all possible baubles are shown.