Same issue here. n8n v.221.2 & postgres-ha.
My n8n has hundreds of thousands of executions per day. I believe what @MutedJam said was the cause, that n8n logs the ‘error’ whenever an execution occurs and write to an existing row, instead of doing something like ‘increment if exists’.
I can’t tell if my n8n’s performance is affected, but the log file is getting quite crazy lol. It’d be great if you guys could find a solution to this. Thank you for the hard work!