Function execute_loopback_thread 

pub async fn execute_loopback_thread(
    pool: &DbPool,
    node_id: i64,
    root_tweet_id: &str,
    url: &str,
    child_tweet_ids: Vec<String>,
) -> LoopBackResult

Execute provenance-driven loop-back for a thread.

Like execute_loopback, but builds a thread-typed entry with child_tweet_ids and thread_url populated.