Oh geez. Yes, i did change the data type to try to shrink the size. I saw i believe one post with >400 edits, but all other posts were in the single digit edit range. I figured it was a glitch and that truncating it to 256/255 edits wouldn't cause an issue. I guess phpbb checks the values it writes.
Of course the oddball had to be yours!
Rather than take the database down for another 30 minutes, i just reset your post count to 3. Give that a try.
We can repeat this fix in 5 years
Restoring a single old post might take a few hours, and it's something i'd have to do after work.
Is it possible for you to fix it in less time?