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Fix performance issue with the disk serializer
This is the issue noted in #76. Keeping all historical results of queries in the HistoricalQueryResults struct makes serializing and deserializing those structs very, very slow as time goes on. By only storing the last execution of the query, we keep the performance constant, but we kill the feature where osquery can rebuild timelines without accessing logs. After talking it over, we decided that this isn't actually that big of a deal because, if you really wanted to rebuild the old data, you should be able to process the logs, similarly to bin log replication in MySQL.
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