# Core Utilities

Fundamental components including database connections, configuration, exceptions, and utility functions.

```{toctree}
:caption: 'Core Components:'
:maxdepth: 2

database
config
exceptions
utils
decorators
logging_utils
metrics
notification_service
operation_types
queue_discovery
settings_manager
```

## Overview

Core utilities provide the foundation for the data transfer system:

**Database**

: Database connection and ORM models.

**Configuration**

: System configuration management and settings.

**Exceptions**

: Custom exception classes for error handling.

**Utilities**

: Common utility functions and helpers.

**Decorators**

: Reusable decorators for common patterns.

**Logging Utils**

: Logging configuration and utilities.

**Metrics**

: Performance metrics and monitoring.

**Notification Service**

: System notifications and alerts.

**Operation Types**

: Data models for operation types and states.

**Queue Discovery**

: Celery queue discovery and management.

**Settings Manager**

: Dynamic settings management.

## Core Architecture

These components provide the foundation that all managers and services build upon:

- Database connectivity and data models
- Configuration management
- Error handling and logging
- Performance monitoring
- System notifications

For understanding how these components fit into the larger system:

- {doc}`../../concepts` - Core concepts and data model
- {doc}`../../philosophy` - System design principles