This account, having about 9 million edits on Wiktionary:
Wiktionary interwiki 'bot
User "Interwicket" is the 'bot that adds interwiki (inter-language) links to entries. It is designed for the Wiktionaries. It is not the "wikipedia bot", it is much more efficient. It operates only in the main namespace (NS:0).
However it's listed in https://stats.wikimedia.org/wiktionary/EN/TablesWikipediaHSB.htm#sleeping