thrillwiki_django_no_react/memory-bank/decisions/migration-progress.md

Foreign Key Constraint Resolution - 2025-02-09 (Updated)

Revision Note

Corrected migration sequence conflict:

• Original 0002 migration conflicted with existing 0002 file
• Created new migration as 0012_cleanup_invalid_designers.py
• Deleted conflicting 0002_cleanup_invalid_designers.py

Updated Resolution Steps

1. Created conflict-free migration 0012
2. Verified migration dependencies:

   dependencies = [
       ('rides', '0011_merge_20250209_1143'),
       ('designers', '0001_initial'),
   ]
   

3. New migration command:

   python manage.py migrate rides 0012_cleanup_invalid_designers
   

PGHistory Migration Fix - 2025-02-09

Foreign key constraint violation during pghistory migration:

1. Issue: rides_ride_designer_id_172b997d_fk_designers_designer_id constraint violation during 0010_rideevent migration
2. Resolution:
   • Created new cleanup migration (0009_cleanup_invalid_designers_pre_events.py) to run before event table creation
   • Updated migration dependencies to ensure proper sequencing:

     # 0009_cleanup_invalid_designers_pre_events.py
     dependencies = [
         ('rides', '0008_historicalride_post_closing_status_and_more'),
         ('designers', '0001_initial'),
     ]
     

   • Created merge migration (0013_merge_20250209_1214.py) to resolve multiple leaf nodes
3. Final Migration Sequence:
   • Base migrations up to 0008
   • Cleanup migration (0009_cleanup_invalid_designers_pre_events)
   • Event table creation (0010_rideevent_ridemodelevent_and_more)
   • Merge migrations (0011, 0012, 0013)