- Add eventify_id CharField (unique, indexed, editable=False) to User - Auto-generate on save() with charset excluding I/O/0/1 for clarity - Migration 0012: add field nullable, backfill all existing users, make non-null - Sync migration 0011 (allowed_modules) pulled from server - Expose eventify_id in accounts/api.py, partner/api.py serializers - Expose eventify_id in mobile_api login response (populates localStorage)