private ProcessorFilter mapRecord(final Record record) {
        final Processor processor = RECORD_TO_PROCESSOR_MAPPER.apply(record);
        final ProcessorFilter processorFilter = recordToProcessorFilterMapper.apply(record);
        final ProcessorFilterTracker processorFilterTracker =
                RECORD_TO_PROCESSOR_FILTER_TRACKER_MAPPER.apply(record);
        processorFilter.setProcessor(processor);
        processorFilter.setProcessorFilterTracker(processorFilterTracker);
        return processorFilter;
    }
Physically delete old processor filters that are logically deleted with an update time older than the threshold.

@param deleteThreshold Only physically delete filters with an update time older than the threshold.
@return The processor filter UUIDs of all the processor filters deleted.
stroom-processor/stroom-processor-impl-db/src/main/java/stroom/processor/impl/db/ProcessorFilterDaoImpl.java