Fix tag usage count performance#27850

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sonika-shah wants to merge 3 commits intomainfrom

fix-tag-usage-count-batch-query

Commits on Apr 30, 2026

Fix tag usage count: pre-compute hierarchical hashes, drop COUNT(DISTINCT), batch correctly
sonika-shah
committed
Chunk exact-match IN list at 1000 hashes per query to bound IN size
sonika-shah
committed
Batch descendant counts into a single round-trip per chunk
sonika-shah
committed