docs: add session data export endpoint documentation

docs/v1/concepts/sessions.mdx

@@ -94,8 +94,66 @@ agentops.init(inherited_session_id=<id>)
 
 Both processes will now contribute data to the same session.
 
+## Session Data Export
+AgentOps provides REST endpoints to export your session data and statistics. These endpoints allow you to retrieve detailed information about your sessions programmatically.
+
+### Authentication
+All data export requests require a single header:
+- `X-Agentops-Api-Key`: Your AgentOps API key
+
+### Available Endpoints
+
+#### Get Session Statistics
+```http
+GET /v2/sessions/<session_id>/stats
+```
+
+Returns statistics for the specified session including:
+- Event counts
+- Duration
+- Costs
+- Token usage
+- Other session metrics
+
+#### Export Complete Session Data
+```http
+GET /v2/sessions/<session_id>/export
+```
+
+Returns comprehensive session data including:
+- Session metadata
+- Statistics
+- All recorded events:
+  - Actions
+  - LLM calls
+  - Tool usage
+  - Errors
+
+### Example Usage
+```python
+import requests
+
+# Your AgentOps API key
+api_key = "your-api-key"
+session_id = "your-session-id"
+
+headers = {
+    "X-Agentops-Api-Key": api_key
+}
+
+# Get session stats
+stats_url = f"https://api.agentops.ai/v2/sessions/{session_id}/stats"
+stats_response = requests.get(stats_url, headers=headers)
+stats = stats_response.json()
+
+# Export complete session data
+export_url = f"https://api.agentops.ai/v2/sessions/{session_id}/export"
+export_response = requests.get(export_url, headers=headers)
+session_data = export_response.json()
+```
+
 ## Session Analytics
-You can retrieve the analytics for a session by calling `session.get_analytics()`. 
+You can retrieve the analytics for a session by calling `session.get_analytics()`.
 
 The example below shows how to record events and retrieve analytics.
 
@@ -127,4 +185,4 @@ be applied. You can also apply different configuration options when you start a
 [Configuration](/v1/usage/sdk-reference/#configuration) object.
 
 <script type="module" src="/scripts/github_stars.js"></script>
-<script type="module" src="/scripts/adjust_api_dynamically.js"></script>
+<script type="module" src="/scripts/adjust_api_dynamically.js"></script>