Commits on Jan 14, 2024

1. Add an index to better support smaller_number_is_higher_priority …

   The preexisting index (introduced in bensheldon#726) gave a direct answer to the
   materialized subquery used to find candidate jobs, subject to the ordering rules
   that were in place at that time.  In bensheldon#883, `GoodJob` deprecated that ordering in
   favour of a lower-is-more-important scheme, aligning with Active Job.
   
   When there are a substantial number of completed jobs, the `priority desc` index
   does not allow for a straight index scan, and may not actually be used by the
   planner.  Aligning the sort orders here allows for the subquery to be satisfied
   directly.
   
   Although `ASC NULLS LAST` is the default (as observable in the generated schema)
   it seems appropriate to be explicit in the actual index declaration, although
   mostly for consistency with the previous version.

   

   mkrfowler committed Jan 14, 2024
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