描述
Design storage-model and migration-safety packets for relational, document-heavy, and hybrid data systems. Use when the user needs entity ownership, constraints, indexes, multi-tenant or audit boundaries, staged schema changes, or queryable-vs- flexible field decisions across backend/fullstack products, internal ops tools, marketing/customer-data workflows, or game/live-ops systems. Route API contracts to `api-design`, auth-owned identity/session modeling to `authentication-setup`, verification to `backend-testing`, and reporting/telemetry follow-through to `looker-studio-bigquery` or `monitoring-observability`.