Query a twitter-to-sqlite database and find the "deepest" tweets in a reply thread, adapted from https://gist.github.com/robinhouston/f689a4b833dc027a3fd97e3de855927b

deepest.sql

with recursive thread as (
    select id, in_reply_to_status_id, 0 as depth
        from tweets
        where in_reply_to_status_id is null
    union
        select tweets.id, tweets.in_reply_to_status_id, 1 + thread.depth as depth
        from thread join tweets on tweets.in_reply_to_status_id = thread.id)
select * from thread order by depth desc

Variant using a suggestion from Matthew Somerville which adds the concatenated hierarchy of tweet IDs:

with recursive thread as (
    select id, in_reply_to_status_id, 0 as depth, id as ids
        from tweets
        where in_reply_to_status_id is null
    union
        select tweets.id, tweets.in_reply_to_status_id, 1 + thread.depth as depth, thread.ids || ',' || tweets.id as ids
        from thread join tweets on tweets.in_reply_to_status_id = thread.id)
select * from thread where depth > 1 order by depth asc

Similar solution from Piers Cawley: https://twitter.com/pdcawley/status/1180898024832327680

WITH RECURSIVE threads(id, thread, depth) AS (
  SELECT tw.id, tw.id, 1 FROM tweets tw WHERE in_reply_to_status_id IS NULL
UNION
  SELECT tw.id, tw.id || ', ' || th.thread, th.depth + 1
    FROM threads th
    JOIN tweets tw ON th.id = tw.in_reply_to_status_id
)
select id, thread, depth from threads order by depth desc limit 10;