shows how to use the "approved" field in a Participants Database record to prevent a record from being edited

pdb-prevent-unapproved-record-edit.php

<?php
// if the record is not approved, they cannot edit the record.
// you can easily adapt this to any other checkbox field so you can use that field to prevent editing
add_filter( 'pdb-check_submission', function() {
  if ( !is_admin() && $_POST['action'] === 'update' ) {
    $record = Participants_Db::get_participant( $_POST['id']);
    // if the field has a value of "yes" allow editing
    // if it is any other value, editing will not be allowed
    return $record['approved'] === 'yes'; 
  }
  return true;
} );