chore: Remove SQLite and streamline dependencies

Removed unnecessary dependencies for API-only application using Couchbase:

**Removed gems:**
- sqlite3 (not needed - using Couchbase as database)
- capybara (no system testing for API)
- selenium-webdriver (no browser automation needed)
- sprockets-rails (no asset pipeline for API)
- importmap-rails (no JavaScript imports needed)
- turbo-rails (no Hotwire features needed)
- stimulus-rails (no Stimulus controllers needed)

**Configuration changes:**
- Updated config/application.rb to load only required Rails components
- Excluded activerecord/railtie (using couchbase-orm instead)
- Excluded active_storage/engine and action_cable/railtie (not needed)
- Updated config/database.yml with clear note that it's not used
- Commented out ActiveRecord configurations in spec/rails_helper.rb
- Removed active_storage configuration from config/environments/test.rb

**Removed directories/files:**
- app/javascript/ (unused Stimulus controllers)
- db/ (no migrations with Couchbase)
- config/importmap.rb (not needed)
- config/initializers/assets.rb (no asset pipeline)

**Impact:**
- Reduced gem count and bundle size
- Faster boot time and bundle install
- Clearer developer onboarding (no SQLite confusion)
- All 27 tests passing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: teetangh

Gemfile

@@ -5,24 +5,9 @@ ruby '3.4.1'
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
 gem 'rails', '~> 7.1.3', '>= 7.1.3.2'
 
-# The original asset pipeline for Rails [https://github.com/rails/sprockets-rails]
-gem 'sprockets-rails'
-
-# Use sqlite3 as the database for Active Record
-gem 'sqlite3', '~> 1.4'
-
 # Use the Puma web server [https://github.com/puma/puma]
 gem 'puma', '>= 5.0'
 
-# Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
-gem 'importmap-rails'
-
-# Hotwire's SPA-like page accelerator [https://turbo.hotwired.dev]
-gem 'turbo-rails'
-
-# Hotwire's modest JavaScript framework [https://stimulus.hotwired.dev]
-gem 'stimulus-rails'
-
 # Build JSON APIs with ease [https://github.com/rails/jbuilder]
 gem 'jbuilder'
 
@@ -72,7 +57,5 @@ group :development do
 end
 
 group :test do
-  # Use system testing [https://guides.rubyonrails.org/testing.html#system-testing]
-  gem 'capybara'
-  gem 'selenium-webdriver'
+  # API-only testing with RSpec (no system/browser testing needed)
 end

app/javascript/application.js

@@ -1,6 +1,23 @@
 require_relative 'boot'
 
-require 'rails/all'
+# Load Rails components individually (excluding activerecord since we use Couchbase via couchbase-orm)
+require 'rails'
+%w(
+  action_controller
+  action_view
+  action_mailer
+  active_job
+).each do |framework|
+  begin
+    require "#{framework}/railtie"
+  rescue LoadError
+  end
+end
+
+# Excluded components (using Couchbase instead of ActiveRecord):
+# - active_record/railtie - Using Couchbase via couchbase-orm
+# - active_storage/engine - Not needed for API-only app
+# - action_cable/railtie - Not using WebSockets
 
 # Require the gems listed in Gemfile, including any gems
 # you've limited to :test, :development, or :production.

app/javascript/controllers/application.js

@@ -1,25 +1,19 @@
-# SQLite. Versions 3.8.0 and up are supported.
-#   gem install sqlite3
-#
-#   Ensure the SQLite 3 gem is defined in your Gemfile
-#   gem "sqlite3"
+# NOTE: This file is not used by the application.
+# This application uses Couchbase as its database through the couchbase-orm gem.
+# Database connections are configured in config/initializers/couchbase.rb
 #
+# The configuration below is kept for Rails compatibility but is not actively used.
+# No SQL database (SQLite, PostgreSQL, MySQL) is required for this application.
+
+# Minimal configuration to prevent Rails from attempting database connections
 default: &default
-  adapter: sqlite3
-  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
-  timeout: 5000
+  adapter: nulldb
 
 development:
   <<: *default
-  database: storage/development.sqlite3
 
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
 test:
   <<: *default
-  database: storage/test.sqlite3
 
 production:
   <<: *default
-  database: storage/production.sqlite3

app/javascript/controllers/hello_controller.js

@@ -35,7 +35,7 @@
   config.action_controller.allow_forgery_protection = false
 
   # Store uploaded files on the local file system in a temporary directory.
-  config.active_storage.service = :test
+  # config.active_storage.service = :test  # Commented out - not using ActiveStorage
 
   config.action_mailer.perform_caching = false