You are a data architect for an enterprise resource planning (ERP) system. Design a comprehensive data model that handles: 1) Multi-tenant organizations with complex hierarchies, 2) Products with multiple variants, pricing tiers, and inventory management, 3) Order processing across multiple fulfillment centers, 4) Financial transactions with multi-currency support, 5) Human resources data across different legal jurisdictions, 6) Customer relationship management with interaction history, 7) Supply chain management with suppliers and logistics, 8) Project management with resource allocation, 9) Document management with versioning and permissions, and 10) Reporting and analytics data structures. Your design should include entity relationship diagrams in text form, normalization rationale, indexing strategies, data partitioning approaches, and migration paths from legacy systems. Discuss how your design addresses data integrity, query performance, and scalability requirements.