[Rails] batch processing question

In my app a user can set the status of a Post to different flags like
'v' - visible, 'd' - mark for delete etc.

These flags are set via controller actions.

I have a batch process that runs and cleans all the posts marked for
delete.

Post.find(:all, :conditions => ['status = ?', 'd']).each do |p|
p.destroy end

This batch process runs every x many minutes.

Let's say a user marks the post with 'd' => batch process runs at some
points => while the process is running the user marks the post as 'v'.
Now inside the batch process the record is already targeted for delete
and will be when the do loop is done, but the flag has changed via the
controller action.

Ideally, if this happens I would like to not delete that post in the
batch process.

What's the best way to handle this?

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