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  • Hi @jmh

    Aah, yes, you could write a custom query indeed.
    1. Use get_posts to find all the posts
    2. Use the update_field function to save the value

    Please note that you will need to use the field_key instead of the field_name. The reason for this is explained int he update_field docs, but basically, ACF needs to know which field you have saved the value from.