Previously, `db.deleteMany` on postgres resulted in 2 roundtrips to the
database (find + delete with ids). This PR passes the where query
directly to the `deleteWhere` function, resulting in only one roundtrip
to the database (delete with where).
If the where query queries other tables (=> joins required), this falls
back to find + delete with ids. However, this is also more optimized
than before, as we now pass `select: { id: true }` to the findMany
query.
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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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