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What this PR does / why we need it?
Remove unused trie
Trie was initially introduced to reduce the number of events from a common ancestor(#351). However, it was later removed during the implementation of the topic subscribe feature(#487, #566).
For now, I'll remove unused Trie and reopen the event-reducing issue again(#266).
Any background context you want to provide?
What are the relevant tickets?
Fixes #
Checklist