- Add migration 030 with sites table, RLS policy, and device site_id FK - Add Site SQLAlchemy model with tenant isolation - Add site_id nullable FK and relationship to Device model - Add sites relationship to Tenant model - Register Site in models __init__.py - Add SiteCreate, SiteUpdate, SiteResponse, SiteListResponse schemas Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>