cqrs/services/orderinfo/main.py [138:150]:
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    event_id = attributes['event_id']
    event_type = attributes['event_type']

    query = ds_client.query(kind='ProcessedEvent')
    query.keys_only()
    query.add_filter('event_id', '=', event_id)
    if list(query.fetch()): # duplicate
        print('Duplicate event {}'.format(event_id))
        return 'Finished.', 200

    if event_type != 'order_create':
        print('Unknown event type {}.format(event_type)')
        return 'Finished.', 200
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services/customer-async/main.py [132:144]:
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    event_id = attributes['event_id']
    event_type = attributes['event_type']

    query = ds_client.query(kind='ProcessedEvent')
    query.keys_only()
    query.add_filter('event_id', '=', event_id)
    if list(query.fetch()): # duplicate
        print('Duplicate event {}'.format(event_id))
        return 'Finished.', 200

    if event_type != 'order_create':
        print('Unknown event type {}.format(event_type)')
        return 'Finished.', 200
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