After the initial subpath index build, iterate and delete all entries
where count==1. At scale, 60-70% of subpath keys are singletons that
appear only once — they add no analytical value and consume significant
memory (each entry is a string key + map bucket overhead).
Newly-seen singletons during incremental ingest will remain in the
index until the next restart. This is acceptable since singleton
subpaths are noise for ranking/display purposes.
Add a startup log line showing how many entries were kept vs dropped.
you
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