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This introduces the basic created_at query plan. We scan the created_at + id index in descending order looking for items that match a filter. This is a very general query plan, but might not be very efficient for anything other than local timelines. Changelog-Added: Add general created_at query plan for timelines Closes: https://github.com/damus-io/nostrdb/issues/26 Signed-off-by: William Casarin <jb55@jb55.com>