Vishnu Narayanan fefa0a6966 perf: add composite index for account-scoped conversation created_at sort (#15360)
## Description

Adds a composite index `(account_id, status, created_at)` on
`conversations`.

Sorting an account's conversation list by `created_at` ("newest first")
across all inboxes has no supporting index today, so Postgres falls back
to a backward scan of the global `index_conversations_on_created_at`
filtered by `account_id`. On large databases the planner estimates a
very deep scan and the query can exceed the statement timeout. The
composite index lets the ordered limit be served directly from the
`account_id`/`status` prefix. The default `last_activity_at` sort and
inbox-filtered views are unaffected (already indexed).

The index is created with `algorithm: :concurrently` (no table lock). On
very large installations, create it out-of-band concurrently before
deploying so the migration doesn't run a long build.

Fixes https://linear.app/chatwoot/issue/CW-7888

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
2026-08-13 18:34:12 +05:30
2019-08-14 15:18:44 +05:30
2026-01-15 20:28:13 -08:00
2023-05-06 10:44:52 +05:30
2026-08-10 12:07:39 -07:00
2019-10-20 14:17:26 +05:30
2026-07-17 13:56:39 -07:00
2024-10-02 00:36:30 -07:00
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2024-10-02 00:36:30 -07:00
2025-01-16 10:59:33 -08:00
2026-07-27 15:42:11 +05:30

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