Three issues from when the fixture was created before schema evolved:
- Game and Platform lacked created_at (auto_now_add bypassed by loaddata)
- Purchase lacked created_at/updated_at
- Purchase used 'game' FK that no longer exists; field is now the M2M
'games', serialized as a list
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>