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* [MM-71476] Compute thread reply stats in one query to avoid full index scan on reply delete Deleting the last live reply in a thread could time out on large Posts tables: the MAX-only LastReplyAt subquery let Postgres use a backward scan of idx_posts_create_at, which walks the entire index when no live reply remains. Selecting COUNT and MAX together prevents that rewrite, so the query reads the thread through idx_posts_root_id_delete_at. Also return the thread cleanup error before updating the root post's UpdateAt, and return an error from that update instead of only logging it, so the real cause is no longer masked by "driver: bad connection". Co-authored-by: mattermost-code <matty-code@mattermost.com> * Address PR feedback: 0 answered, 1 resolved, 0 declined Add a Postgres EXPLAIN test for the thread reply stats query, rendered from a shared threadReplyStatsQuery helper, with a MAX-only control case. * Address PR feedback: 0 answered, 1 resolved, 0 declined --------- Co-authored-by: Cursor Agent <cursoragent@cursor.com> Co-authored-by: mattermost-code <matty-code@mattermost.com>
Mattermost is an open core, self-hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
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