Add creation_address column to users

This is a properly typed and indexed column that is intended
to replace creation_ip to allow fast queries.

db/migrate/20240910175616_add_user_creation_address.rb

@@ -0,0 +1,8 @@
+class AddUserCreationAddress < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    add_column :users, :creation_address, :inet
+    add_index :users, :creation_address, :using => :gist, :opclass => :inet_ops, :algorithm => :concurrently
+  end
+end