I'd guess that you're getting complaints about starts_at(5i) and ends_at(5i) and that you have both starts_at and ends_at defined as datetimes or timestamps. I'd also guess that you're coming from SQLite. SQLite has a very loose type system, PostgreSQL's is quite strict; if you try to put '06:00:00' into a PostgreSQL timestamp column, PostgreSQL will complain because timestamps require both the date and time of day components.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.