Zero rows in production — this is a schema-only migration in practice.
team_id kept for app code compatibility. Drop deferred to later cleanup.
Backfill: team_id → team admin user → account_id; fallback: created_by.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Introduces the TargetList model (team-scoped JSONB target arrays),
Pydantic schemas, and full CRUD REST API at /target-lists/.
Includes Alembic migration and 5 integration tests (TDD).
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>