chore: add FK to avoid conflict

Author: Bulletdev

db/migrate/20260426194058_remove_messages_user_foreign_keys.rb

@@ -6,8 +6,8 @@
 # at the application layer via recipient_type / sender_type.
 class RemoveMessagesUserForeignKeys < ActiveRecord::Migration[7.2]
   def up
-    remove_foreign_key :messages, name: 'fk_rails_12e9de2e48' # recipient_id -> users
-    remove_foreign_key :messages, name: 'fk_rails_273a25a7a6' # user_id -> users
+    remove_foreign_key :messages, name: 'fk_rails_12e9de2e48', if_exists: true # recipient_id -> users
+    remove_foreign_key :messages, name: 'fk_rails_273a25a7a6', if_exists: true # user_id -> users
   end
 
   def down