Avoids two sequential scans of massive tables (`workspace_builds`,
`provisioner_jobs`) and uses index scans instead. This new view largely
replicates our already optimized query `GetWorkspaces` to fetch the
latest build.
The original query and the new query were compared against the dogfood
database to ensure they return the exact same data in the exact same
order (minus the new `workspaces.deleted = false` filter to improve
performance even more). The performance is massively improved even
without the `workspaces.deleted = false` filter, but it was added to
improve it even more.
Note: these query times are probably inflated due to high database load
on our dogfood environment that this intends to partially resolve.
Before: 2,139ms
([explain](https://explain.dalibo.com/plan/997e4fch241b46e6))
After: 33ms
([explain](https://explain.dalibo.com/plan/c888dc223870f181))
Co-authored-by: Cian Johnston <cian@coder.com>
---------
Signed-off-by: Danny Kopping <dannykopping@gmail.com>
Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>
Co-authored-by: Danny Kopping <dannykopping@gmail.com>
