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fix(catalog-backend): split queryEntities list and count queries

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The filtered CTE was referenced twice (count + data), preventing
Postgres 12+ from inlining it. This forced full materialization of
the filtered set before LIMIT could short-circuit. Split into two
separate queries run via Promise.all so the list CTE is only
referenced once and the planner can short-circuit on LIMIT.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Fredrik Adelöw <freben@gmail.com>
This commit is contained in:
Fredrik Adelöw
2026-05-20 15:48:22 +02:00
parent 813608335f
commit 4829e8961e
2 changed files with 65 additions and 19 deletions
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.changeset/split-query-entities-count.md
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'@backstage/plugin-catalog-backend': patch
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Split the `queryEntities` list and count into separate queries instead of a multi-reference CTE. When the `filtered` CTE was referenced twice (once for the count, once for the data), PostgreSQL refused to inline it, forcing full materialization of the filtered set before applying `LIMIT`. By running the count as a standalone query, the list CTE is only referenced once, allowing the planner to short-circuit on `LIMIT` and return the first page in milliseconds instead of waiting for the full filtered set to materialize.