Define range of AccessRoles as -inf-50

Annotate reserved role ranges
Document Access Roles in README.md

README.md

@@ -28,4 +28,42 @@ user-specific configuration.
 ### Messagebus
 These schemas define messages sent on the messagebus. Historically, messagebus
 events have not used any validation, so there is greater risk of Message objects
-failing validation than other schemas defined here. 
+failing validation than other schemas defined here.
+
+## Access Roles
+This module defines `AccessRoles` for use with Role-Based Access Control (RBAC).
+The `AccessRoles` enum defines some specific roles and is structured such that
+roles correspond to an integer value in the range of `-inf`-`50`.
+
+Roles are structured such that `0` corresponds to no permissions and `50` is
+reserved for unlimited permissions. A role will always include the permissions
+available to any role with a smaller positive number. For example, an `ADMIN`
+role with a value of `30` will have access to everything a `USER` with value `20`
+does, and possibly more.
+
+A role is defined per service, so a user may have greater access to some 
+resources than others. For example, a user may have unlimited access to manage
+LLM deployments, but only read access to the DIANA backend.
+
+### Service Roles
+Roles with a value <0 are intended for use by non-user service accounts. These
+roles contain specific access that is limited to the requirements of a specific 
+program or service.
+
+For example, the `AccessRoles.NODE` role is used by a node device making
+API requests.
+
+### Guest Role
+The `AccessRoles.GUEST` role is used by a guest user, which is usually implemented
+as a single account with public credentials.
+
+### User Role
+The `AccessRoles.USER` role is used by a registered user. It should NOT be 
+assumed that a registered user has been verified or validated in any way.
+
+### Admin Role
+The `AccessRoles.ADMIN` role is assigned to a user who is responsible to 
+administration of a resource.
+
+### Owner Role
+The `AccessRoles.OWNER` role is assigned to a user who owns a resource.

neon_data_models/enum.py

@@ -36,13 +36,18 @@ class AccessRoles(IntEnum):
     admins, and owners.
     """
     NONE = 0
-    GUEST = 1
-    USER = 2
-    # 3-5 Reserved for "premium users"
-    ADMIN = 6
-    # 7-8 Reserved for "restricted owners"
-    OWNER = 9
-    # 10 Reserved for "unlimited access"
+    # 1-9 reserved for unauthenticated connections
+    GUEST = 10
+    # 11-19 reserved for unverified user roles
+    USER = 20
+    # 21-29 Reserved for "premium users"
+    ADMIN = 30
+    # 31-39 Reserved for "restricted owners"
+    OWNER = 40
+    # 41-49 Reserved for "escalated owners"
+
+    # 50 Reserved for "unlimited access"
+
     NODE = -1