200.Firehose will save the storage key that was altered, and the previous and next values.
200should be the next changed value for the
previous_datakey. If a discrepancy is encountered it means there is an issue with the extraction mechanism and data quality will be negatively impacted.
bytes32mapping, making such a data retrieval endeavour rather opaque and difficult to reason about. This data is available with additional effort, but not easily.