Comment 25 for bug 276950

this index:
create index packageupload__distroseries__status__archive__idx on packageupload(id, distroseries, archive) where status in (0,1);

launchpad_qastaging=> explain analyze SELECT PackageUpload.archive,
       PackageUpload.changesfile,
       PackageUpload.date_created,
       PackageUpload.distroseries,
       PackageUpload.id,
       PackageUpload.pocket,
       PackageUpload.signing_key,
       PackageUpload.status
FROM PackageUpload
WHERE packageupload.distroseries = 104
  AND packageupload.archive IN (1, 534)
  AND packageupload.status IN (0)
ORDER BY PackageUpload.id DESC LIMIT 31
 OFFSET 0;
                                                                                      QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit (cost=0.00..104.34 rows=31 width=36) (actual time=0.155..6.775 rows=1 loops=1)
   -> Index Scan Backward using packageupload__distroseries__status__archive__idx on packageupload (cost=0.00..5287.65 rows=1571 width=36) (actual time=0.153..6.772 rows=1 loops=1)
         Index Cond: (distroseries = 104)
         Filter: ((archive = ANY ('{1,534}'::integer[])) AND (status = 0))
 Total runtime: 6.829 ms
(5 rows)