feat: add index to conversation id and account_id (#6757)

- This PR adds an index to conversations id and account_id. This improves the performance of some reports query

config/initializers/rack_profiler.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+if Rails.env.development?
+  require 'rack-mini-profiler'
+
+  # initialization is skipped so trigger it
+  Rack::MiniProfilerRails.initialize!(Rails.application)
+end