こちらエラーの詳細内容です
sqlite3.ProgrammingError: SQLite objects created in a thread can only be used in that same thread.The object was created in thread id 140736583877568 and this is thread id 123145388748800
解決方法
# check_same_threadをFalseにする
conn = sqlite3.connect("../../wnjpn-0.9.db", check_same_thread=False)
これでエラーを解決できました！
参考記事
【Python】ProgrammingError: SQLite objects created in a thread can only be used in that same thread