Rework database functions to fetch multiple items

Issue:
https://github.com/genenetwork/gn-gemtext-threads/blob/main/topics/gn1-migration-to-gn2/partial-correlations.gmi

* In an attempt to optimise the performance of the partial correlations
  feature, this commit reworks some database access functions to fetch
  multiple items from the database, per query, unlike their original forms
  which would fetch a single item per query.

  This reduces queries to the database, and should hopefully improve the
  responsiveness of the partial correlations feature.

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