Yes, I have been reading the conversation. That was so much to learn. I did not know that `SELECT ... FOR UPDATE` is "sort of" a write. I googled and found out

Yes, I have been reading the conversation. That was so much to learn. I did not know that `SELECT ... FOR UPDATE` is "sort of" a write. I googled and found out this SO link: https://stackoverflow.com/questions/18879584/postgres-select-for-update-in-functions https://stackoverflow.com/questions/18879584/postgres-select... that corroborates what you have said.