=== COMPREHENSIVE COURSE ANALYSIS ===

1. COURSES STATUS:
   Total courses (with trashed): 990
   Courses with category_id: 990
   Courses with NULL category_id: 0

2. CATEGORIES:
   Total categories: 736

3. COURSE-CATEGORY RELATIONSHIPS:
   Courses with VALID category_id: 990
   Courses with INVALID category_id: 0
   Courses with NULL category_id: 0

4. MATH CHECK:
   Valid + Invalid + NULL = 990 (should equal 990)

5. COURSES REACHABLE BY CATEGORY RELATIONSHIPS:
   Courses found via category relationships: 990

=== SUMMARY ===
✓ Courses with valid categories: 990
✗ Courses with invalid categories (orphaned): 0
✗ Courses with NULL category: 0
Total orphaned + NULL: 0