feat(web/converse): Import repository r/2440

Imports the converse forum software I wrote a few years ago. I want to
clean this up a bit and try using Hotwire with it.

Note: The original repository was AGPL-3.0 licensed. I'm the copyright
holder and have relicensed it to GPL-3.0 in the commit that is being
merged.

Imported from: https://github.com/tazjin/converse

git-subtree-dir: web/converse
git-subtree-mainline: 386afdc794eefd5bcbc47a3fd7b898a07f69f978
git-subtree-split: 09168021e7405f6b83798d0b43aa6e69e744ae87
Change-Id: Ia8b587db5174ef5b3c52910d3d027199150c58e0

1 files changed, 21 insertions, 0 deletions

diff --git a/web/converse/migrations/2018-04-14-153202_add_stickies_improve_index/up.sql b/web/converse/migrations/2018-04-14-153202_add_stickies_improve_index/up.sql
new file mode 100644
index 000000000000..74a559e35d00
--- /dev/null
+++ b/web/converse/migrations/2018-04-14-153202_add_stickies_improve_index/up.sql
@@ -0,0 +1,21 @@
+-- Add support for stickies in threads
+ALTER TABLE threads ADD COLUMN sticky BOOLEAN NOT NULL DEFAULT FALSE;
+
+-- CREATE a simple view that returns the list of threads ordered by
+-- the last post that occured in the thread.
+CREATE VIEW thread_index AS
+  SELECT t.id AS thread_id,
+         t.title AS title,
+         t.author_name AS thread_author,
+         t.posted AS created,
+         t.sticky AS sticky,
+         p.id AS post_id,
+         p.author_name AS post_author,
+         p.posted AS posted
+    FROM threads t
+    JOIN (SELECT DISTINCT ON (thread_id)
+           id, thread_id, author_name, posted
+          FROM posts
+          ORDER BY thread_id, id DESC) AS p
+    ON t.id = p.thread_id
+    ORDER BY t.sticky DESC, p.id DESC;