Currently, an optimized DB update (simple data => no
delete-and-create-row) does the following:
1. sql UPDATE
2. sql SELECT
This PR reduces this further to one single DB call for simple
collections:
1. sql UPDATE with RETURNING()
This only works for simple collections that do not have any fields that
need to be fetched from other tables. If a collection has fields like
relationship or blocks, we'll need that separate SELECT call to join in
the other tables.
In 4.0, we can remove all "complex" fields from the jobs collection and
replace them with a JSON field to make use of this optimization
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