From 9b52865d8ee09c6aeeaaba293b324fb9d75b34eb Mon Sep 17 00:00:00 2001
From: Hampton Lintorn-Catlin <hampton@squareup.com>
Date: Tue, 24 Feb 2026 14:32:50 -0600
Subject: [PATCH] Switch UUID generation from v4 to v7

Use SecureRandom.uuid_v7 (Ruby 3.4+) instead of SecureRandom.uuid (v4).
UUIDv7 (RFC 9562) embeds a 48-bit unix timestamp, so primary keys
naturally sort chronologically. This fixes comment reply ordering and
improves B-tree index locality.

Amp-Thread-ID: https://ampcode.com/threads/T-019c9157-b075-7443-9d10-f4aa772fec8f
Co-authored-by: Amp <amp@ampcode.com>
---
 app/models/application_record.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index 828ef2d8..37ddd999 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -6,6 +6,6 @@ class ApplicationRecord < ActiveRecord::Base
   private
 
   def assign_uuid
-    self.id = SecureRandom.uuid
+    self.id = SecureRandom.uuid_v7
   end
 end