MIGRATION_SUMMARY.md

Data Migration Summary for New Chat

🎯 Current Situation

• Repository has been cleaned up from ~450 files to ~90 files (production ready)
• Database has OLD tables with data and NEW enhanced tables without data
• Table structures are DIFFERENT - cannot do simple data copy
• Need to migrate data preserving relationships and enhancing structure

📊 Database State Analysis

Tables WITH Data (OLD - need to migrate FROM these):

1. course_prereqs

   • Structure: course_id, prereq_course_id (simple mapping)
   • Has prerequisite relationship data

2. courses_with_lp (likely a VIEW)

   • Has Learning Perspective assignments for courses
   • Structure unknown - needs inspection

Tables WITHOUT Data (NEW - need to migrate TO these):

1. course_prerequisites

   • Enhanced structure: id, course_id, prerequisite_course_id, is_required, prerequisite_type, notes, created_at, updated_at

2. course_learning_perspectives

   • Junction table: id, course_id, learning_perspective_code, is_primary, fulfillment_strength, notes, created_at, updated_at

Safe to Delete:

• lp_requirements - no data in either old or new

🚀 Required Actions

Step 1: Inspect Table Structures

-- Check exact structure of old tables
SELECT column_name, data_type FROM information_schema.columns WHERE table_name = 'course_prereqs';
SELECT column_name, data_type FROM information_schema.columns WHERE table_name = 'courses_with_lp';

Step 2: Create Structure-Aware Migration

• Map old course_prereqs columns to new course_prerequisites enhanced structure
• Map old courses_with_lp columns to new course_learning_perspectives junction table
• Handle data type conversions and default values

Step 3: Execute Migration + Verification

• Migrate data with proper structure mapping
• Verify record counts match
• Test that application code works with new tables

Step 4: Cleanup

• Delete old tables: course_prereqs, courses_with_lp, lp_requirements
• Add optimized indexes

🎯 Goal

Convert from old simple tables to new enhanced relational structure while preserving all existing course and prerequisite data.

📁 Current Repository State

• ✅ Code updated to use new table names
• ✅ Repository cleaned up (production ready)
• ✅ New database schema created
• ⏳ NEED: Data migration from old to new tables
• ⏳ THEN: Import 83 scraped course programs