def insert_data(self, processed_data):
    db_session_commit(processed_data)

def calculate_something(self, data):
    processed_data = external_lib_function(data)
    print(processed_data)

async def wrapper(self, data):
    processed_data = self.calculate_something(data)
    self.insert_data(processed_data)

async def main():
    if True:
        global nursery
        async with trio.open_nursery() as _nursery:
            nursery = _nursery
            await trio.to_thread.run_sync(self.wrapper, data)

trio.run(main)