Lots of queries setting `note_html` to NULL
We're seeing a lot of dead tuples being generated in the notes
table (gitlab-com/infrastructure#632), and this looks suspect:
2016-10-22_08:22:40.28171 db4 postgresql: 2016-10-22 08:22:40 GMT [34994]: [414-1] LOG: duration: 5912.467 ms execute <unnamed>: UPDATE "notes" SET "note_html" = NULL WHERE "notes"."id" IN (5079258, 5079259, 5079260, 5079261, 5079262, 5079263, 5079264, 5079265, 5079266, 5079268, 5079269, 5079271, 5079272, 5079273, 5079274, 5079275, 5079276, 5079277, 5079278, 5079279, 5079280, 5079281, 5079282, 5079283, 5079284, 5079285, 5079286, 5079287, 5079288, 5079289, 5079290, 5079291, 5079292, 5079293, 5079294, 5079295, 5079296, 5079297, 5079298, 5079299, 5079300, 5079301, 5079302, 5079303, 5079304, 5079305, 5079306, 5079307, 5079308, 5079309, 5079310, 5079311, 5079312, 5079313, 5079314, 5079315, 5079316, 5079317, 5079318, 5079319, 5079320, 5079321, 5079322, 5079323, 5079324, 5079325, 5079326, 5079327, 5079328, 5079329, 5079330, 5079331, 5079332, 5079333, 5079334, 5079335, 5079336, 5079339, 5079340, 5079341, 5079342, 5079343, 5079344, 5079346, 5079349, 5079350, 5079351, 5079352, 5079353, 5079354, 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