# Phase 1 — Data Model: Graph Contracts Registry Completeness

## Summary

This feature introduces **no new database entities** and does not modify any existing schema.

## Affected “Entities” (Configuration-only)

Although no database model changes occur, the feature affects the following configuration concepts:

- **Graph Contract Type**: A named entry in `config/graph_contracts.php` representing a Microsoft Graph resource.
- **Graph Contract Subresource**: A named sub-path template belonging to a contract type (used to model nested resources).

## Ownership & Scope

- **Ownership**: Workspace scope.
- **Persistence**: Configuration only; no new tables/records.

## Validation Rules

- Contract type identifiers must be stable and used consistently in code.
- Resource paths must be representable via the registry and reusable by call sites.