Leonid Pershin
f14daa3df1
- Introduced a new error, `CannotRemoveLastAdmin`, to handle attempts to downgrade the last admin user in the system. - Updated `RoleService` to check the number of admin users before allowing a role change that would remove the last admin. - Enhanced unit tests to verify the new behavior, ensuring that attempts to downgrade the last admin correctly propagate the failure. - Updated API documentation to reflect the new validation logic and its implications for role management.