Enhancement: Move reporting metrics to postgres (#606)

db/migrate/20200311083854_add_index_to_message.rb

@@ -0,0 +1,7 @@
+class AddIndexToMessage < ActiveRecord::Migration[6.0]
+  def change
+    add_index :messages, :account_id
+    add_index :messages, :inbox_id
+    add_index :messages, :user_id
+  end
+end