I currently have roles of users stored in my psql table now I want to use spiceDB, so should I duplicate my roles data to spiceDB or just move my data to spiceDB and then query spice DB whenever I need to get roles of some user(s)?

The answer is it depends. Most likely you also store additional metadata about the roles that SpiceDB won't be able to store, thus making it unpractical to become the source of truth. The alternative is to make SpiceDB a "copy" or denormalization of the source of truth in your pSQL.

i have one more question here is my schema definition user { relation belongs_to: organization permission delete = belongs_to->delete_user permission make_admin = belongs_to->make_admin permission make_member = belongs_to->make_member } definition organization { relation member: user relation admin: user permission delete_user = admin permission make_admin = admin permission make_member = admin } currently only admin can delete any user but i want that user can also delete itself only, how to make that happen?

You'd add a

self

relation, and write a relationship from the user to itself. See an example: https://play.authzed.com/s/oMY6CUnMhVut/schema