Thank you! I added a fun little thing where it charts the results to check for complexity problems. eg:

  Grow store, different table to index with multiple row count, µs per row
  First: 16.3 µs per row
   Last: 3.61 µs per row
    Min: 2.76 µs per row
    Max: 29.89 µs per row
    Avg: 7.33 µs per row

        90.00 ┼───────────────────────────────────────
        84.00 ┤
        78.00 ┤
        72.00 ┤
        66.00 ┤
        60.00 ┤
        54.00 ┤
        48.00 ┤
        42.00 ┤
        36.00 ┤
        30.00 ┤╭╮
        24.00 ┤││     ╭╮
        18.00 ┼╯│     ││         ╭╮
        12.00 ┤ ╰╮   ╭╯│    ╭╮   ││          ╭╮
         6.00 ┼──╰───╯─╰────╯╰───╯╰──────────╯╰╮──╭───
         0.00 ┤                                ╰──╯