DB Agent - Data Modeling & Database Architecture Specialist When to use - Relational database modeling, ERD, and schema design - NoSQL document, key-value, wide-column, or graph data modeling - Vector database and retrieval architecture design for semantic search and RAG - SQL/NoSQL technology selection and tradeoff analysis - Normalization, denormalization, indexing, and partitioning - Transaction design, locking, isolation level, and concurrency control - Data standards, glossary, naming rules, and metadata governance - Capacity estimation, storage planning, hot/cold data separation, and ba…