# Sessions API

This document outlines the API endpoints for managing user sessions in PySpur.
Sessions are used to maintain conversation history in agent spurs.
Each session is tied to a user and a spur.
For quick testing purposes, use the create test user endpoint. It also creates a default test user if doesn't exist.

## Create Session

**Description**: Creates a new session. If a session with the given external ID already exists, returns the existing session.

**URL**: `/session/`

**Method**: POST

**Request Payload**:
```python
class SessionCreate:
    user_id: str  # User ID
    workflow_id: str  # Workflow ID
    external_id: Optional[str] = None  # External identifier for the session
```

**Response Schema**:
```python
class SessionResponse:
    id: str  # Session ID
    user_id: str  # User ID
    workflow_id: str  # Workflow ID
    external_id: Optional[str]  # External identifier for the session
    created_at: datetime  # When the session was created
    updated_at: datetime  # When the session was last updated
    messages: List[MessageResponse]  # List of messages in the session
```

## List Sessions

**Description**: Lists sessions with pagination and optional user filtering.

**URL**: `/session/`

**Method**: GET

**Query Parameters**:
```python
skip: int = 0  # Number of sessions to skip (min: 0)
limit: int = 10  # Number of sessions to return (min: 1, max: 100)
user_id: Optional[str] = None  # Filter sessions by user ID
```

**Response Schema**:
```python
class SessionListResponse:
    sessions: List[SessionResponse]  # List of sessions
    total: int  # Total number of sessions
```

## Get Session

**Description**: Gets a specific session by ID, including all messages.

**URL**: `/session/{session_id}/`

**Method**: GET

**Parameters**:
```python
session_id: str  # Session ID
```

**Response Schema**:
```python
class SessionResponse:
    id: str  # Session ID
    user_id: str  # User ID
    workflow_id: str  # Workflow ID
    external_id: Optional[str]  # External identifier for the session
    created_at: datetime  # When the session was created
    updated_at: datetime  # When the session was last updated
    messages: List[MessageResponse]  # List of messages in the session
```

## Delete Session

**Description**: Deletes a session.

**URL**: `/session/{session_id}/`

**Method**: DELETE

**Parameters**:
```python
session_id: str  # Session ID
```

**Response**: 204 No Content

## Create Test Session

**Description**: Creates or reuses a test user and session. If a test user exists, it will be reused. If an empty test session exists for the same workflow, it will be reused. Otherwise, a new session will be created.

**URL**: `/session/test/`

**Method**: POST

**Query Parameters**:
```python
workflow_id: str  # Workflow ID
```

**Response Schema**:
```python
class SessionResponse:
    id: str  # Session ID
    user_id: str  # User ID
    workflow_id: str  # Workflow ID
    external_id: Optional[str]  # External identifier for the session
    created_at: datetime  # When the session was created
    updated_at: datetime  # When the session was last updated
    messages: List[MessageResponse]  # List of messages in the session
```