feat: Introduce multi-tenancy support with organization-specific data, add interactive transcript functionality, and enhance lesson/course schemas.

services/lms-service/migrations/20260115000008_fix_enrollment_constraints.sql

@@ -0,0 +1,9 @@
+-- Migration: Add unique constraint to enrollments table
+-- Required for fn_enroll_student ON CONFLICT logic
+
+DO $$ 
+BEGIN 
+    IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'enrollments_user_id_course_id_key') THEN
+        ALTER TABLE enrollments ADD CONSTRAINT enrollments_user_id_course_id_key UNIQUE (user_id, course_id);
+    END IF;
+END $$;