[Issues Board Sorting] Wrong relative position calculation

Only exists in master (1 day)

We calculate relative position based on a random number between two terminating positions. This algorithm is not going to work because maximum value will be gotten pretty fast: 16-25 iterations(for 4 bytes integer) If we used float (8 bytes is default for ruby and postgresql) that would be 40-45 iterations. So it's not a matter of size, the algorithm is just wrong.

To prove that I wrote a little script:

max = 2147483647
min = 0

resulted_value = nil

20000.times do |i|
  resulted_value ||= min

  resulted_value = rand(resulted_value..max)

  puts resulted_value

  if resulted_value == max
    raise "got max value after #{i} iterations"
  end
end

puts "Result: #{resulted_value}"

/cc @DouweM @smcgivern