# Module: credentials

## Purpose

Simple data holder for user authentication credentials (email + password).

## Public Interface

### Classes

#### `Credentials` (cdef class)

| Attribute | Type | Visibility |
|-----------|------|------------|
| email     | str  | public     |
| password  | str  | public     |

| Method         | Signature                                    | Description                        |
|----------------|----------------------------------------------|------------------------------------|
| `__init__`     | `(self, str email, str password)`            | Constructor                        |
| `__str__`      | `(self) -> str`                              | Returns `"email: password"` format |

## Internal Logic

No logic — pure data class.

## Dependencies

- **Internal**: none (leaf module)
- **External**: none

## Consumers

- `security` — `get_api_encryption_key` takes `Credentials` as parameter
- `api_client` — holds a `Credentials` instance, uses `.email` and `.password` for login and key derivation

## Data Models

The `Credentials` class itself is the data model.

## Configuration

None.

## External Integrations

None.

## Security

Stores plaintext password in memory. No encryption at rest.

## Tests

No tests found.