Assisted-by: Claude Opus 4.6 via Claude Code

diff --git a/Gemfile b/Gemfile
index e263aa0..db2f673 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,6 +8,7 @@ gem "phlex"
 gem "puma"
 gem "rackup"
 gem "roda"
+gem "sentry-ruby"
 gem "sequel"
 gem "sqlite3"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 13e292f..94684d1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -82,6 +82,10 @@ GEM
       prism (>= 1.2, < 2.0)
       rbs (>= 3, < 5)
     securerandom (0.4.1)
+    sentry-ruby (6.3.1)
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      logger
     sequel (5.101.0)
       bigdecimal
     sqlite3 (2.9.0-aarch64-linux-gnu)
@@ -145,6 +149,7 @@ DEPENDENCIES
   rbs-inline
   roda
   ruby-lsp
+  sentry-ruby
   sequel
   sqlite3
   steep
@@ -196,6 +201,7 @@ CHECKSUMS
   roda (3.100.0) sha256=35d36f43c68d2bd1974dc77ade8c873558265a191018e1ada88ca662f1fa8e62
   ruby-lsp (0.26.6) sha256=1f50b21cb300586d7742190fc8446c18387f488aa0e9d276cf2bc7f3684ccda2
   securerandom (0.4.1) sha256=cc5193d414a4341b6e225f0cb4446aceca8e50d5e1888743fac16987638ea0b1
+  sentry-ruby (6.3.1) sha256=b2de4e9bada1053a36f4224d75617a2b44d33157e9030b20b86a791358c2e154
   sequel (5.101.0) sha256=d2ae3fd997a7c4572e8357918e777869faf90dc19310fcd6332747122aed2b29
   sqlite3 (2.9.0-aarch64-linux-gnu) sha256=cfe1e0216f46d7483839719bf827129151e6c680317b99d7b8fc1597a3e13473
   sqlite3 (2.9.0-aarch64-linux-musl) sha256=56a35cb2d70779afc2ac191baf2c2148242285ecfed72f9b021218c5c4917913
diff --git a/config.ru b/config.ru
index efd1c58..fed2e93 100644
--- a/config.ru
+++ b/config.ru
@@ -1,7 +1,19 @@
 # frozen_string_literal: true
 
+require "sentry-ruby"
+
+Sentry.init do |config|
+  config.dsn = ENV.fetch("SENTRY_DSN")
+
+  # Add data like request headers and IP for users,
+  # see https://docs.sentry.io/platforms/ruby/data-management/data-collected/ for more info
+  config.send_default_pii = true
+end
+
 $LOAD_PATH.unshift(File.expand_path("lib", __dir__))
 
 require_relative "lib/ketchup/web"
 
+use Sentry::Rack::CaptureExceptions
+
 run Web.freeze.app