pub async fn fetch_one<DB: DbMarker>(self, storage: &mut Connection<'_, DB>) -> DalResult<O> {
        let (conn, tags) = storage.conn_and_tags();
        self.data.fetch(tags, self.query.fetch_one(conn)).await
    }
Fetches a single row using this query.
core/lib/db_connection/src/instrument.rs