Securing HANA database is important and unfortunately, there are very few resources available on the internet. Here is an interesting article that provides tips & recommendations on securing HANA DB. Click Here.
If you are designing HANA Roles & Privileges, you should read this interesting article - "A Right Approach for Building SAP HANA Privilege Based Roles". Read through it and appreciate your feedback. https://togglenow.com/resources/blogs/sap-hana-privilege-based-roles/