Alright, let's kick things off by setting up user roles. These roles will help us manage who gets to do what in your Xano app.

1. Head over to the Database section in Xano.
2. Create a new table and call it Roles.
3. Add columns to define the roles, like role_id and role_name.

Next, we need to link these roles to your users. This way, we can control their access levels.

1. In the Database section, find the Users table.
2. Add a new column named role_id to connect each user to a role.
3. Fill this column with the right role IDs for each user.

Now, let's create an Access Control List (ACL) table. This table will define what each role can do.

1. Go to the Database section.
2. Create a new table named ACL.
3. Add columns like acl_id, role_id, resource, and permission.

Time to fill up the ACL table with permissions for different roles and resources.

1. Insert records that specify which role has permission for which resource.
2. Each record should include a role_id, resource, and permission (like read, write, delete).

Let's make sure our API endpoints respect these permissions.

1. Go to the API section and pick the endpoint you want to secure.
2. In the endpoint settings, add a precondition step to check the user's role and permissions from the ACL table.
3. Use Xano’s query functions to get the user's role_id and see if they have the right permissions for the requested resource.

Now, let's test everything to make sure it works.

1. Test the API endpoints with users who have different roles.
2. Check that each user can only access the resources they're allowed to.
3. Make any necessary adjustments to the roles and permissions in the ACL table.

Finally, keep an eye on your permissions and update them as needed.

1. Regularly audit the roles and permissions to keep up with changing business needs.
2. Adjust the ACL definitions based on any new resources or access patterns.