PostgreSQL and RDS are quite a bit more than just a log-structured data store, and are not prima facie the correct solution for this problem domain, regardless of how much arrogant ignorance you bring to bear on the debate.
You broke the site guidelines badly in more than one place in this thread. I realize you're trying to defend someone's work against what you feel is unfair criticism, but breaking the site guidelines yourself, with swipes and name-calling and flamewar, is exactly the wrong way to do this.
Would you please stop posting flamewar comments and breaking the site guidelines? You've been doing that repeatedly and badly in this thread. We end up having to ban such accounts, and I don't want to ban you.
Fortunately it doesn't look from your recent comments that you've been in the habit of posting this way, so it should be easy to fix.
PostgreSQL and RDS are quite a bit more than just a log-structured data store, and are not prima facie the correct solution for this problem domain, regardless of how much arrogant ignorance you bring to bear on the debate.