Add NOT NULL requirement to columns on account_conversations (#33308)

app/models/account_conversation.rb

@@ -5,13 +5,13 @@
 # Table name: account_conversations
 #
 #  id                      :bigint(8)        not null, primary key
-#  account_id              :bigint(8)
-#  conversation_id         :bigint(8)
+#  lock_version            :integer          default(0), not null
 #  participant_account_ids :bigint(8)        default([]), not null, is an Array
 #  status_ids              :bigint(8)        default([]), not null, is an Array
-#  last_status_id          :bigint(8)
-#  lock_version            :integer          default(0), not null
 #  unread                  :boolean          default(FALSE), not null
+#  account_id              :bigint(8)        not null
+#  conversation_id         :bigint(8)        not null
+#  last_status_id          :bigint(8)
 #
 
 class AccountConversation < ApplicationRecord