> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-devupd-1765394015-eccef47.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Data purging for compliance

This guide covers the various features available after data reaches LangSmith Cloud servers to help you achieve your privacy goals.

## Data retention

LangSmith provides automatic data retention capabilities to help with compliance and storage management. Data retention policies can be configured at the organization and project levels.

For detailed information about data retention configuration and management, please refer to the [Data Retention concepts](/langsmith/administration-overview#data-retention) documentation.

## Trace deletes

You can use the API to complete trace deletes. The API supports two methods for deleting traces:

1. **By trace IDs and session ID**: Delete specific traces by providing a list of trace IDs and their corresponding session ID (up to 1000 traces per request)
2. **By metadata**: Delete traces across a workspace that match any of the specified metadata key-value pairs

For more details, refer to the [API spec](https://api.smith.langchain.com/redoc#tag/run/operation/delete_runs_api_v1_runs_delete_post).

<Warning>
  All trace deletions will delete related entities like feedbacks, aggregations, and stats across all data storages.
</Warning>

### Deletion timeline

Trace deletions are processed during non-peak usage times and are not instant. LangChain runs the delete job on the weekend. There is no confirmation of deletion - you'll need to query the data again to verify it has been removed.

### Delete specific traces

To delete specific traces by their trace IDs from a single session:

<Note>
  The `session_id` is the project ID for the trace you are trying to delete. You can find it on the tracing project page in the LangSmith UI.
</Note>

```bash theme={null}
curl -X POST "https://api.smith.langchain.com/api/v1/runs/delete" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "trace_ids": ["trace-id-1", "trace-id-2", "trace-id-3"],
    "session_id": "session-id-1"
  }'
```

### Delete by metadata

When deleting by metadata:

* Accepts a `metadata` object of key/value pairs. KV pair matching uses an **or** condition. A trace will match if it has **any** of the key-value pairs specified in metadata (not all)
* You don't need to specify a session id when deleting by metadata. Deletes will apply across the workspace.

To delete traces based on metadata across a workspace (matches **any** of the metadata key-value pairs):

```bash theme={null}
curl -X POST "https://api.smith.langchain.com/api/v1/runs/delete" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "metadata": {
      "user_id": "user123",
      "environment": "staging"
    }
  }'
```

This will delete traces that have either `user_id: "user123"` **or** `environment: "staging"` in their metadata.

<Warning>
  Remember that you can only schedule up to 1000 traces per session per request. For larger deletions, you'll need to make multiple requests.
</Warning>

## Example deletes

You can delete dataset examples self-serve via our API, which supports both soft and hard deletion methods depending on your data retention needs.

<Warning>
  Hard deletes will permanently remove inputs, outputs, and metadata from ALL versions of the specified examples across the entire dataset history.
</Warning>

### Deleting examples is a two-step process

For bulk operations, example deletion follows a two-step process:

#### 1. Search for examples by metadata

Find all examples with matching metadata across all datasets in a workspace.

[GET /examples](https://api.smith.langchain.com/redoc#tag/examples/operation/read_examples_api_v1_examples_get)

* `as_of` must be explicitly specified as a timestamp. Only examples created before the `as_of` date will be returned

```bash theme={null}
curl -X GET "https://api.smith.langchain.com/api/v1/examples?as_of=2024-01-01T00:00:00Z" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "metadata": {
      "user_id": "user123",
      "environment": "staging"
    }
  }'
```

This will return examples that have either `user_id: "user123"` **or** `environment: "staging"` in their metadata across all datasets in your workspace.

#### 2. Hard delete examples

Once you have the example IDs, send a delete request. This will zero-out the inputs, outputs, and metadata from all versions of the dataset for that example.

[DELETE /examples](https://api.smith.langchain.com/redoc#tag/examples/operation/delete_examples_api_v1_examples_delete)

* Specify example IDs and add `"hard_delete": true` to the query params of the request

```bash theme={null}
curl -X DELETE "https://api.smith.langchain.com/api/v1/examples?hard_delete=true" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "example_ids": ["example-id-1", "example-id-2", "example-id-3"]
  }'
```

### Deletion types

#### Soft delete (default)

* Creates tombstoned entries with NULL inputs/outputs in the dataset
* Preserves historical data and maintains dataset versioning
* Only affects the current version of the dataset

#### Hard delete

* Permanently removes inputs, outputs, and metadata from ALL dataset versions
* Complete data removal when compliance requires zero-out across all versions
* Add `"hard_delete": true` to the query parameters

For more details, refer to the [API spec](https://api.smith.langchain.com/redoc#tag/examples/operation/delete_examples_api_v1_examples_delete).

***

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