feat(perf): add index to messages created at (#7044)

* feat: add index to messages created at

* feat: run migration

app/models/message.rb

@@ -27,6 +27,7 @@
 #  index_messages_on_additional_attributes_campaign_id  (((additional_attributes -> 'campaign_id'::text))) USING gin
 #  index_messages_on_content                            (content) USING gin
 #  index_messages_on_conversation_id                    (conversation_id)
+#  index_messages_on_created_at                         (created_at)
 #  index_messages_on_inbox_id                           (inbox_id)
 #  index_messages_on_sender_type_and_sender_id          (sender_type,sender_id)
 #  index_messages_on_source_id                          (source_id)

db/migrate/20230509101256_add_index_to_messages_created_at.rb

@@ -0,0 +1,6 @@
+class AddIndexToMessagesCreatedAt < ActiveRecord::Migration[7.0]
+  disable_ddl_transaction!
+  def change
+    add_index :messages, [:created_at], name: 'index_messages_on_created_at', algorithm: :concurrently
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_04_26_130150) do
+ActiveRecord::Schema[7.0].define(version: 2023_05_09_101256) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
   enable_extension "pg_trgm"
@@ -667,6 +667,7 @@
     t.index ["account_id"], name: "index_messages_on_account_id"
     t.index ["content"], name: "index_messages_on_content", opclass: :gin_trgm_ops, using: :gin
     t.index ["conversation_id"], name: "index_messages_on_conversation_id"
+    t.index ["created_at"], name: "index_messages_on_created_at"
     t.index ["inbox_id"], name: "index_messages_on_inbox_id"
     t.index ["sender_type", "sender_id"], name: "index_messages_on_sender_type_and_sender_id"
     t.index ["source_id"], name: "index_messages_on_source_id"