As far as I'm aware any existing rows at the point the column was added will have a value of 0. Any new rows added from that point on will have a consecutive incrementing value. I wouldn't recommend anything that edits this table outside of the product though.
No, there are no zeros, they added a sequentially numbered column to the audit trail, retroactively for all existing rows. I just wanted to know how they sorted it, to confirm whether it matches up with how my code does it.
I don't add anything to the table, I just read it and create my own rowId numbers (in another table) and then do my parsing from there. In the earlier versions this was the only reliable way that my "business time" calculations could determine how long tickets spent "with customer." I noticed this column had appeared, and I would like to discard all of my "auxiliary" objects and just use this column, but I wanted to know how they performed the sort when they added the sequential numbers.