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4da1291876
Before this commit, the plugin first fetched a list of all (deserialized) records in a list, then reversed the list, and iterated on the reverse list. This proved to be slow, with most of the time being spent in `dbi.DB._newRecord` (which essentially deserializes one list of CSV). After this commit, the list is reversed first, then the plugin iterates on its generator, which calls `_newRecord` on records as they are requested. This means that when there are many URLs in the database, `@last` does not need to waste time deserializing most records, when the result is near the end (and if the result is the first record, then it does exactly as much work as before).