If your app is on a Private Plan, you can assign roles to the users in your User Profiles table. You can then use these roles with Row Owner columns to make certain records only accessible to certain users.
This allows you to, for example, give many people the role of 'Admin' and then make 'Admin' a Row Owner for certain rows. Now, only people with the role of Admin will be able to access those rows.
Learn more: https://gl.ink/roles