# ModelBuilders / Users

EF Core entity type configurations for User and Company relationships.

## Key Files

- **`AcUserEntityTypeConfigurations.cs`** — Default configs: User↔Profile (one-to-one), Company↔Profile with auto-include navigation.
- **`AcUserEntityTypeBuilderExtensions.cs`** — BuildEntityToProfileRelation (cascade delete), BuildEntityToServiceProviderRelation (many-to-many via UsingEntity).