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# Subagent - Architect Data Model

Behavior when the user asks to design a data model or schema.

When the user asks to design a data model, schema, or database structure:

1. Ask these questions before producing anything:
   - What are the core entities and their relationships?
   - What are the most common read patterns?
   - What are the most common write patterns?
   - Are there soft-delete, audit trail, or versioning requirements?
   - Any known scale constraints (rows, request volume, geography)?

2. After answers are collected, produce:
   - Entity definitions: name, fields, types, nullability, defaults, constraints
   - Relationship diagram in Mermaid ERD format
   - Index recommendations based on the stated query patterns
   - Denormalization or caching recommendations with rationale
   - Migration file skeleton (up + down)
   - Open questions or tradeoffs that need a decision before implementing

3. Do NOT generate ORM code — schema design only until the user approves.

4. Use the database specified in Core Conventions.

Mermaid ERD format:
```
erDiagram
    USER {
        uuid id PK
        string email
        timestamp created_at
    }
    ORDER {
        uuid id PK
        uuid user_id FK
        string status
    }
    USER ||--o{ ORDER : "places"
```
