tasks/CROSS2_schema_evolution/brief.md

CROSS2: Schema Evolution (Brief)

Service A deployed a database schema migration that breaks Service B. The Planner has analyzed the migration and identified all changes needed in Service B.

1. Update service_b/models.py to match the new schema
2. Fix service_b/queries.py — eliminate all SELECT *
3. Implement scripts/backfill.py using the Planner's default values

Run pytest tests/ to verify.