diff --git a/.github/workflows/gss2020_backend.yml b/.github/workflows/gss2020_backend.yml
deleted file mode 100644
index 3ed96d68..00000000
--- a/.github/workflows/gss2020_backend.yml
+++ /dev/null
@@ -1,60 +0,0 @@
-name: 幻水総選挙2022 バックエンド
-
-on:
-  push:
-  workflow_dispatch:
-
-jobs:
-  gss2022_backend:
-    name: 継続的インテグレーション
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        node-version: ["18.x"]
-        ruby-version: ["3.1"]
-    steps:
-    # - name: MySQL のセットアップを行う
-    #   # https://github.com/mirromutth/mysql-action
-    #   uses: mirromutth/mysql-action@v1.1
-    #   with:
-    #     host port: 3306
-    #     container port: 3306
-    #     character set server: utf8mb4
-    #     collation server: utf8mb4_unicode_ci
-    #     mysql version: '8.0'
-    #     # mysql database: some_test
-    #     mysql root password: root
-    #     # mysql user: 'developer'
-    #     # mysql password: ${{ secrets.DatabasePassword }}
-    # - name: MySQL の疎通を待つ
-    #   run: |
-    #     while ! mysqladmin ping --host=127.0.0.1 --password=root --silent; do
-    #       sleep 1
-    #     done
-    # - name: MySQL の文字コードおよびバージョンを確認する
-    #   run: |
-    #     mysql -h 127.0.0.1 --port 3306 -uroot -proot -e "show variables like 'chara%'"
-    #     mysql -h 127.0.0.1 --port 3306 -uroot -proot -e "select version()"
-    - name: コードをチェックアウトする
-      uses: actions/checkout@v3
-    - name: Ruby のセットアップを行う
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby-version }}
-        bundler-cache: true
-    # - name: Node.js のセットアップを行う
-    #   uses: actions/setup-node@v3
-    #   with:
-    #     node-version: ${{ matrix.node-version }}
-    #     cache: "yarn"
-    # - name: db:create db:migrate する
-    #   run: |
-    #     bin/rails db:create db:migrate
-    #   env:
-    #     RAILS_ENV: test
-    #     DATABASE_HOST: 127.0.0.1
-    # - name: RSpec を実行する
-    #   run: |
-    #     bundle exec rspec
-    #   env:
-    #     DATABASE_HOST: 127.0.0.1
diff --git a/.github/workflows/gss2022_backend_on_built_in_postgres.yml b/.github/workflows/gss2022_backend_on_built_in_postgres.yml
new file mode 100644
index 00000000..ce4cf348
--- /dev/null
+++ b/.github/workflows/gss2022_backend_on_built_in_postgres.yml
@@ -0,0 +1,73 @@
+name: 幻水総選挙2022 バックエンド
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  gss2022_backend:
+    name: (pg on built-in) 継続的インテグレーション
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: ["18.x"]
+        ruby-version: ["3.1"]
+    env:
+      CI: true
+      RAILS_ENV: test
+      POSTGRES_HOST_TEST: localhost
+      POSTGRES_PORT_TEST: 5432
+      POSTGRES_USERNAME_TEST: postgres_user
+      POSTGRES_PASSWORD_TEST: postgres_password
+    steps:
+    # https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-Readme.md
+    - name: PostgreSQL を起動する
+      run: |
+        sudo systemctl start postgresql.service
+    - name: PostgreSQL の起動待ち（ヘルスチェック）をする
+      run: |
+        until : > /dev/tcp/localhost/5432; do
+          echo -n .
+          sleep 1
+        done
+
+        echo 'PostgreSQL の起動が確認できました'
+    - name: PostgreSQL のユーザー（ロール）のセットアップを行う
+      # NOTE: バージョン番号が埋め込みになっているのが良くない
+      run: |
+        sudo bash -c "echo \"local all all md5\" >> /etc/postgresql/$major_version_number/main/pg_hba.conf"
+
+        sudo su postgres -c "psql postgres -c 'create role $username;'"
+        sudo su postgres -c "psql postgres -c \"alter role $username with login password '$password';\""
+        sudo su postgres -c "psql postgres -c \"alter role $username with superuser\""
+      env:
+        major_version_number: 14
+        username: postgres_user
+        password: postgres_password
+    - name: コードをチェックアウトする
+      uses: actions/checkout@v3
+    - name: Ruby のセットアップを行う
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true
+    - name: $ bundle install を行う
+      uses: actions/cache@v3
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gem-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-gem-
+    - name: （予定地）Node.js のセットアップを行う
+      run: |
+        echo 'Node.js を使うことがあれば "actions/setup-node" を用いる'
+        echo 'uses: actions/setup-node@v3'
+        echo 'with:'
+        echo 'node-version: ${{ matrix.node-version }}'
+        echo 'cache: "yarn"'
+    - name: データベースをセットアップする
+      run: |
+        bin/rails db:prepare
+    - name: RSpec を実行する
+      run: |
+        bundle exec rspec
diff --git a/.github/workflows/gss2022_backend_on_postgres_services.yml b/.github/workflows/gss2022_backend_on_postgres_services.yml
new file mode 100644
index 00000000..5246b1b3
--- /dev/null
+++ b/.github/workflows/gss2022_backend_on_postgres_services.yml
@@ -0,0 +1,62 @@
+name: 幻水総選挙2022 バックエンド
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  gss2022_backend:
+    name: (pg on services) 継続的インテグレーション
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: ["18.x"]
+        ruby-version: ["3.1"]
+    services:
+      postgres:
+        image: postgres:14.3
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_USER: postgres_user
+          POSTGRES_PASSWORD: postgres_password
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+    env:
+      CI: true
+      RAILS_ENV: test
+      POSTGRES_HOST_TEST: localhost
+      POSTGRES_PORT_TEST: 5432
+      POSTGRES_USERNAME_TEST: postgres_user
+      POSTGRES_PASSWORD_TEST: postgres_password
+    steps:
+    - name: コードをチェックアウトする
+      uses: actions/checkout@v3
+    - name: Ruby のセットアップを行う
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true
+    - name: $ bundle install を行う
+      uses: actions/cache@v3
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gem-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-gem-
+    - name: （予定地）Node.js のセットアップを行う
+      run: |
+        echo 'Node.js を使うことがあれば "actions/setup-node" を用いる'
+        echo 'uses: actions/setup-node@v3'
+        echo 'with:'
+        echo 'node-version: ${{ matrix.node-version }}'
+        echo 'cache: "yarn"'
+    - name: データベースをセットアップする
+      run: |
+        bin/rails db:prepare
+    - name: RSpec を実行する
+      run: |
+        bundle exec rspec
diff --git a/.rspec b/.rspec
index aae9b46f..8dbc462c 100644
--- a/.rspec
+++ b/.rspec
@@ -1 +1 @@
---require spec_helper --format documentation
+--require spec_helper --format documentation --force-color --backtrace
diff --git a/README.md b/README.md
index 5897995a..d627b71e 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,8 @@
+On PostgreSQL Services
+[![幻水総選挙2022 バックエンド](https://github.com/true-runes/suikoden-election-2022-backend/actions/workflows/gss2022_backend_on_postgres_services.yml/badge.svg)](https://github.com/true-runes/suikoden-election-2022-backend/actions/workflows/gss2022_backend_on_postgres_services.yml)
+
+On Built-In PostgreSQL
+[![幻水総選挙2022 バックエンド](https://github.com/true-runes/suikoden-election-2022-backend/actions/workflows/gss2022_backend_on_built_in_postgres.yml/badge.svg)](https://github.com/true-runes/suikoden-election-2022-backend/actions/workflows/gss2022_backend_on_built_in_postgres.yml)
+
 # 幻水総選挙2022（バックエンド）
 - いつもの
diff --git a/app/lib/twitter_rest_api.rb b/app/lib/twitter_rest_api.rb
index 5f0a1fcf..71267111 100644
--- a/app/lib/twitter_rest_api.rb
+++ b/app/lib/twitter_rest_api.rb
@@ -1,10 +1,51 @@
 class TwitterRestApi
-  def self.client(consumer_key: nil, consumer_secret: nil, access_token: nil, access_secret: nil)
+  # account_key は シンボル で指定する
+  def self.client(account_key: nil)
+    return if account_key.nil?
+
+    credentials = convert_account_key_to_credentials(account_key)
+    return if credentials.nil?
+
     Twitter::REST::Client.new do |config|
-      config.consumer_key        = consumer_key || ENV.fetch('TWITTER_CONSUMER_KEY', nil)
-      config.consumer_secret     = consumer_secret || ENV.fetch('TWITTER_CONSUMER_SECRET', nil)
-      config.access_token        = access_token || ENV.fetch('TWITTER_ACCESS_TOKEN', nil)
-      config.access_token_secret = access_secret || ENV.fetch('TWITTER_ACCESS_SECRET', nil)
+      config.consumer_key        = credentials[:consumer_key]
+      config.consumer_secret     = credentials[:consumer_secret]
+      config.access_token        = credentials[:access_token]
+      config.access_token_secret = credentials[:access_token_secret]
     end
   end
+
+  def self.convert_account_key_to_credentials(account_key)
+    {
+      gensosenkyo: {
+        consumer_key: ENV.fetch('TWITTER_CONSUMER_KEY_GENSOSENKYO', nil),
+        consumer_secret: ENV.fetch('TWITTER_CONSUMER_SECRET_GENSOSENKYO', nil),
+        access_token: ENV.fetch('TWITTER_ACCESS_TOKEN_GENSOSENKYO', nil),
+        access_token_secret: ENV.fetch('TWITTER_ACCESS_SECRET_GENSOSENKYO', nil)
+      },
+      sub_gensosenkyo: {
+        consumer_key: ENV.fetch('TWITTER_CONSUMER_KEY_SUB_GENSOSENKYO', nil),
+        consumer_secret: ENV.fetch('TWITTER_CONSUMER_SECRET_SUB_GENSOSENKYO', nil),
+        access_token: ENV.fetch('TWITTER_ACCESS_TOKEN_SUB_GENSOSENKYO', nil),
+        access_token_secret: ENV.fetch('TWITTER_ACCESS_SECRET_SUB_GENSOSENKYO', nil)
+      },
+      tmytn: {
+        consumer_key: ENV.fetch('TWITTER_CONSUMER_KEY_TMYTN', nil),
+        consumer_secret: ENV.fetch('TWITTER_CONSUMER_SECRET_TMYTN', nil),
+        access_token: ENV.fetch('TWITTER_ACCESS_TOKEN_TMYTN', nil),
+        access_token_secret: ENV.fetch('TWITTER_ACCESS_SECRET_TMYTN', nil)
+      },
+      tmychan: {
+        consumer_key: ENV.fetch('TWITTER_CONSUMER_KEY_TMYCHAN', nil),
+        consumer_secret: ENV.fetch('TWITTER_CONSUMER_SECRET_TMYCHAN', nil),
+        access_token: ENV.fetch('TWITTER_ACCESS_TOKEN_TMYCHAN', nil),
+        access_token_secret: ENV.fetch('TWITTER_ACCESS_SECRET_TMYCHAN', nil)
+      },
+      ayy: {
+        consumer_key: ENV.fetch('TWITTER_CONSUMER_KEY_AYY', nil),
+        consumer_secret: ENV.fetch('TWITTER_CONSUMER_SECRET_AYY', nil),
+        access_token: ENV.fetch('TWITTER_ACCESS_TOKEN_AYY', nil),
+        access_token_secret: ENV.fetch('TWITTER_ACCESS_SECRET_AYY', nil)
+      }
+    }[account_key]
+  end
 end
diff --git a/app/models/tweet_on_tweet_storage.rb b/app/models/tweet_on_tweet_storage.rb
index edaa6385..91510bd6 100644
--- a/app/models/tweet_on_tweet_storage.rb
+++ b/app/models/tweet_on_tweet_storage.rb
@@ -1,5 +1,5 @@
 class TweetOnTweetStorage < ApplicationRecord
-  establish_connection :tweet_storage
+  establish_connection :tweet_storage unless ENV['CI'] == 'true'
 
   self.table_name = :tweets
 
diff --git a/app/models/user_on_tweet_storage.rb b/app/models/user_on_tweet_storage.rb
index 38520d82..3d0374b2 100644
--- a/app/models/user_on_tweet_storage.rb
+++ b/app/models/user_on_tweet_storage.rb
@@ -1,5 +1,5 @@
 class UserOnTweetStorage < ApplicationRecord
-  establish_connection :tweet_storage
+  establish_connection :tweet_storage unless ENV['CI'] == 'true'
 
   self.table_name = :users
 
diff --git a/renovate.json b/renovate.json
new file mode 100644
index 00000000..f45d8f11
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "config:base"
+  ]
+}
diff --git a/spec/factories/user.rb b/spec/factories/user.rb
new file mode 100644
index 00000000..d4ebaeeb
--- /dev/null
+++ b/spec/factories/user.rb
@@ -0,0 +1,9 @@
+FactoryBot.define do
+  factory :user do
+    id_number { 192789663528910849 }
+    name { 'My name is test' }
+    screen_name { 'test_screen_name' }
+    profile_image_url_https { 'https://pbs.twimg.com/profile_images/1123471964058914816/a8sXngWB_400x400.png' }
+    is_protected { false }
+  end
+end
diff --git a/spec/misc/foo_spec.rb b/spec/misc/foo_spec.rb
deleted file mode 100644
index 40fe5591..00000000
--- a/spec/misc/foo_spec.rb
+++ /dev/null
@@ -1,7 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe do
-  it 'Bar' do
-    expect(1 + 1).to eq 2
-  end
-end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
new file mode 100644
index 00000000..e43ae647
--- /dev/null
+++ b/spec/models/user_spec.rb
@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+RSpec.describe User, type: :model do
+  let(:user) { create(:user) }
+
+  it 'User名が期待どおりに等しくあること' do
+    # expect(user.name).to eq 'My name is test'
+    # expect(User.count).to eq 1
+  end
+
+  it 'User名が期待どおりに等しくないこと' do
+    # expect(user.name).not_to eq 'Your name is test'
+    # expect(User.count).to eq 1
+  end
+end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index ef5891fc..2e4152fb 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -17,4 +17,5 @@
   config.use_transactional_fixtures = true
   config.infer_spec_type_from_file_location!
   config.filter_rails_from_backtrace!
+  config.include FactoryBot::Syntax::Methods
 end