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mobile/lib/infrastructure/README.md

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+# Infrastructure Layer
+
+This directory contains the infrastructure layer of Immich. The infrastructure layer is responsible for the implementation details of the app. It includes data sources, APIs, and other external dependencies.
+
+## Structure
+
+- **[Entities](./entities/)**: These are the classes that define the database schema for the domain models.
+- **[Repositories](./repositories/)**: These are the actual implementation of the domain interfaces. A single interface might have multiple implementations.
+- **[Utils](./utils/)**: These are utility classes and functions specific to infrastructure implementations.
+
+```
+infrastructure/
+├── entities/
+│   └── user.entity.dart
+├── repositories/
+│   └── user.repository.dart
+└── utils/
+    └── database_utils.dart
+```
+
+## Usage
+
+The infrastructure layer provides concrete implementations of repository interfaces defined in the domain layer. These implementations are exposed through Riverpod providers in the root `providers` directory.
+
+```dart
+// In domain/services/user.service.dart
+final userRepository = ref.watch(userRepositoryProvider);
+final user = await userRepository.getUser(userId);
+```
+
+The domain layer should never directly instantiate repository implementations, but instead receive them through dependency injection.