From 9d68367a5a8f8c9aca56d6ec2701183ba19d6c71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E3=81=BF=E3=81=A6=E3=82=8B=E3=81=9E?= <miteruzo@naver.com>
Date: Tue, 27 Jan 2026 00:43:52 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20user=5Fips=20=E3=81=AE=20id=20=E3=82=92?=
 =?UTF-8?q?=E5=89=8A=E9=99=A4=EF=BC=88#231=EF=BC=89=20(#238)?=
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#231

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: https://git.miteruzo.com/miteruzo/btrc-hub/pulls/238
---
 backend/app/models/user_ip.rb                 |  2 +
 ...7000900_change_user_ips_to_composite_pk.rb | 47 +++++++++++++++++++
 backend/db/schema.rb                          |  5 +-
 3 files changed, 51 insertions(+), 3 deletions(-)
 create mode 100644 backend/db/migrate/20260127000900_change_user_ips_to_composite_pk.rb

diff --git a/backend/app/models/user_ip.rb b/backend/app/models/user_ip.rb
index 80cf47d..61d2685 100644
--- a/backend/app/models/user_ip.rb
+++ b/backend/app/models/user_ip.rb
@@ -1,4 +1,6 @@
 class UserIp < ApplicationRecord
+  self.primary_key = :user_id, :ip_address_id
+
   belongs_to :user
   belongs_to :ip_address
 
diff --git a/backend/db/migrate/20260127000900_change_user_ips_to_composite_pk.rb b/backend/db/migrate/20260127000900_change_user_ips_to_composite_pk.rb
new file mode 100644
index 0000000..be525e2
--- /dev/null
+++ b/backend/db/migrate/20260127000900_change_user_ips_to_composite_pk.rb
@@ -0,0 +1,47 @@
+class ChangeUserIpsToCompositePk < ActiveRecord::Migration[8.0]
+  def up
+    execute <<~SQL
+      ALTER TABLE
+        user_ips
+          MODIFY COLUMN id BIGINT NOT NULL
+      ;
+    SQL
+
+    execute <<~SQL
+      ALTER TABLE
+        user_ips
+          DROP PRIMARY KEY
+      ;
+    SQL
+
+    remove_column :user_ips, :id
+
+    execute <<~SQL
+      ALTER TABLE
+        user_ips
+          ADD PRIMARY KEY (user_id, ip_address_id)
+      ;
+    SQL
+
+    remove_index :user_ips, name: 'index_user_ips_on_user_id'
+  end
+
+  def down
+    execute <<~SQL
+      ALTER TABLE
+        user_ips
+          DROP PRIMARY KEY
+      ;
+    SQL
+
+    execute <<~SQL
+      ALTER TABLE
+        user_ips
+          ADD COLUMN id BIGINT NOT NULL AUTO_INCREMENT FIRST
+        , ADD PRIMARY KEY (id)
+      ;
+    SQL
+
+    add_index :user_ips, :user_id, name: 'index_user_ips_on_user_id'
+  end
+end
diff --git a/backend/db/schema.rb b/backend/db/schema.rb
index 180735e..7ae8e2e 100644
--- a/backend/db/schema.rb
+++ b/backend/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_01_26_124100) do
+ActiveRecord::Schema[8.0].define(version: 2026_01_27_000900) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -144,13 +144,12 @@ ActiveRecord::Schema[8.0].define(version: 2026_01_26_124100) do
     t.index ["tag_name_id"], name: "index_tags_on_tag_name_id", unique: true
   end
 
-  create_table "user_ips", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+  create_table "user_ips", primary_key: ["user_id", "ip_address_id"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "user_id", null: false
     t.bigint "ip_address_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["ip_address_id"], name: "index_user_ips_on_ip_address_id"
-    t.index ["user_id"], name: "index_user_ips_on_user_id"
   end
 
   create_table "user_post_views", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|