feat: Implement comprehensive course analytics, RBAC with roles and authentication, and dynamic passing thresholds.

services/cms-service/migrations/20231222000002_add_roles.sql

@@ -0,0 +1,8 @@
+-- Add role column to users table for RBAC
+ALTER TABLE users ADD COLUMN IF NOT EXISTS role TEXT NOT NULL DEFAULT 'instructor';
+
+-- Add check constraint to ensure only valid roles are used
+ALTER TABLE users ADD CONSTRAINT check_valid_role CHECK (role IN ('admin', 'instructor', 'student'));
+
+-- Note: In the Studio (CMS), we'll typically have admins and instructors.
+-- In the Experience (LMS), we'll have students, but also need to sync roles.