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Hi @sadhaka
Yes, absolutely. You can manually remove “wpftsi_*” tables, those are only used by WPFTS.
To be sure here is a list of all tables
wpftsi_docs
wpftsi_ilog
wpftsi_index
wpftsi_map
wpftsi_qlog
wpftsi_queue
wpftsi_rawcache
wpftsi_stops
wpftsi_tp
wpftsi_tw
wpftsi_vc
wpftsi_vectors
wpftsi_words
The automatic DB tables deletion is not implemented since users often want to disable or remove WPFTS temporarily, just to upload new version.
Thank you.