I was able to complete all the required assessments. I had two issues, about which I'll tell further.
Firstly, I had an issue with PostgreSQL version:
I was able to fix it with the correct version and connect to AWS RDS:
Error with code from Andrew source:
I fixed it with determined params as in Andrews videos.
Then, I implemented creating activities with Andrew, but there is a missed error with no-passing right handle
I was not able to fix it yet. I guess I need to take it from jwt somehow.