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Migration 035: tenants table with 'Schaeffler' default seed. Migration 036: tenant_id FK on all tables, RLS policies, backfill. New domains/tenants/ with CRUD router (admin only). All domain models extended with tenant_id FK. core/database.py: get_db_for_tenant with RLS context setter. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>