Complete Enhanced Entity-Relationship diagram for a multi-role donation and volunteer management platform with User inheritance (Admin, Donor, Volunteer), Drive coordination, Task allocation, and Beneficiary tracking. The schema enforces referential integrity through foreign keys, role-based access control via ENUM fields, and data validation constraints like CHECK amount>0 on donations. Relationships flow from Users through Drives and Donations to Beneficiaries via an Allocation associative entity, enabling complex queries on donor contributions, volunteer hours, and fund distribution. This normalized design supports real-world nonprofit operations: admins create drives, donors contribute funds, volunteers execute tasks, and allocations ensure transparent beneficiary support. Fork this diagram on Diagrams.so to customize entity attributes, add audit tables, or extend with payment processing and reporting views. The ISA (inheritance) pattern elegantly models role-specific data while maintaining a unified user authentication layer.