Deleting a workspace is supported nativley in LangSmith Self-Hosted v0.10. View instructions for deleting a workspace.Follow the guide below for Self-Hosted versions before v0.10.
The LangSmith UI does not currently support the deletion of an individual workspace from an organization. This, however, can be accomplished by directly removing all traces from all materialized views in ClickHouse (except the runs_history views) and the runs and feedbacks tables and then removing the Workspace from the Postgres tenants table. This command using the Workspace ID as an argument.

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Prerequisites

Ensure you have the following tools/items ready.
  1. kubectl
  2. PostgreSQL client
  3. PostgreSQL database connection:
    • Host
    • Port
    • Username
      • If using the bundled version, this is postgres
    • Password
      • If using the bundled version, this is postgres
    • Database name
      • If using the bundled version, this is postgres
  4. Clickhouse database credentials
    • Host
    • Port
    • Username
      • If using the bundled version, this is default
    • Password
      • If using the bundled version, this is password
    • Database name
      • If using the bundled version, this is default
  5. Connectivity to the PostgreSQL database from the machine you will be running the migration script on.
    • If you are using the bundled version, you may need to port forward the postgresql service to your local machine.
    • Run kubectl port-forward svc/langsmith-postgres 5432:5432 to port forward the postgresql service to your local machine.
  6. Connectivity to the Clickhouse database from the machine you will be running the migration script on.
    • If you are using the bundled version, you may need to port forward the clickhouse service to your local machine.
      • Run kubectl port-forward svc/langsmith-clickhouse 8123:8123 to port forward the clickhouse service to your local machine.
    • If you are using Clickhouse Cloud you will want to specify the —ssl flag and use port 8443
  7. The script to delete a workspace
    • You can download the script from here

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Running the deletion script for a single workspace

Run the following command to run the workspace removal script: 
sh delete_workspace.sh <postgres_url> <clickhouse_url> --workspace_id <workspace_id>
For example, if you are using the bundled version with port-forwarding, the command would look like: 
sh delete_workspace.sh "postgres://postgres:postgres@localhost:5432/postgres" "clickhouse://default:password@localhost:8123/default" --workspace_id 4ec70ec7-0808-416a-b836-7100aeec934b
If you visit the Langsmith UI, you should now see workspace is deleted.