Gravity Forms: automatically delete form entries from a specific form immediately after entry is submitted. Originally: http://www.gravityhelp.com/forums/topic/purposefully-not-save-form-in-entries-database#post-15601

gf_remove_entry.php

<?php

// Delete form entry immediately after it is processed and saved
// change '_1' to the form ID
add_action('gform_post_submission_1', 'remove_form_entry', 10, 2);
function remove_form_entry($entry, $form){
    global $wpdb;

    $lead_id = $entry['id'];
    $lead_table = RGFormsModel::get_lead_table_name();
    $lead_notes_table = RGFormsModel::get_lead_notes_table_name();
    $lead_detail_table = RGFormsModel::get_lead_details_table_name();
    $lead_detail_long_table = RGFormsModel::get_lead_details_long_table_name();

    //Delete from detail long
    $sql = $wpdb->prepare(" DELETE FROM $lead_detail_long_table
                            WHERE lead_detail_id IN(
                                SELECT id FROM $lead_detail_table WHERE lead_id=%d
                            )", $lead_id);
    $wpdb->query($sql);

    //Delete from lead details
    $sql = $wpdb->prepare("DELETE FROM $lead_detail_table WHERE lead_id=%d", $lead_id);
    $wpdb->query($sql);

    //Delete from lead notes
    $sql = $wpdb->prepare("DELETE FROM $lead_notes_table WHERE lead_id=%d", $lead_id);
    $wpdb->query($sql);

    //Delete from lead
    $sql = $wpdb->prepare("DELETE FROM $lead_table WHERE id=%d", $lead_id);
    $wpdb->query($sql);

}

?>