Constant SETUP_HINT 

pub const SETUP_HINT: &str = "Create a database with `turso db create <name>`, then set \
    TURSO_DATABASE_URL (`turso db show --url <name>`) and TURSO_AUTH_TOKEN \
    (`turso db tokens create <name>`) in .env.";

How to get a database URL and token, shown when they are missing.