Delete Session

Permanently delete a closed flow session, purging its database record and all associated results or execution states. **Key Technical Details:** - **Irreversible**: Once deleted, the session and all its results are purged and cannot be recovered. - **Precondition (409 Conflict)**: The session must be closed/ended. If the session is still active, it will reject the request with `409 Conflict` (`session_not_closed`). You can check the current status using [Get Session State](api:GET/es-public-administration/v1/manager/{session_id}). - **Concurrency Lock (504)**: Acquires an exclusive database lock on the session. If the lock cannot be acquired within a reasonable time, it returns `504 Gateway Timeout`. > This endpoint needs to be executed with an app secret, so should always be used in server side without exposing the secret to customers.