Optimize computing pagination totals #6911
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`total_pages` is listed twice.
Queries like `SELECT COUNT(*) FROM (SELECT DISTINCT resources.* FROM resources ORDER BY resources.created_at DESC LIMIT 1 OFFSET 30) subquery_for_count` are too inefficient
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This is a rebased version of #5389.
Some of the changes proposed there have already been introduced, but there was some extra stuff that still seems useful. I guess this is lacking a spec, but seems ok to me other than that.