[internetter]

> I just tried to use atuin... I have to login, but I don't want to

It didn't ask me to login...

> I tried to run a search locally... but I have to run a PostgreSQL server

PostgreSQL is for the server? You don't need a server. It uses sqlite, verifiable by running

$ sqlite3 ~/.local/share/atuin/history.db $ SELECT * FROM history LIMIT 10;

Did you actually try it? I don't know where you got all this from.