Threading in 'while True' loop

First of all, I've only started working with Python a month ago, so I don't have deep knowledge about anything.

In a project I'm trying to collect the results of multiple (simultaneous) functions in a database, infinitely until I tell it to stop. In an earlier attempt, I successfully used multiprocessing to do what I need, but since I now need to collect all the results of those functions for a database within the main, I switched to threading instead.

Basically, what I'm trying to do is:

collect1 = Thread(target=collect_data1)
collect2 = Thread(target=collect_data2)
send1 = Thread(target=send_data1)
send2 = Thread(target=send_data2)
collect = (collect1, collect2)
send = (send1, send2)
while True:
    try:
        for thread in collect:
            thread.start()
        for thread in collect:
            thread.join()
        for thread in send:
            thread.start()
        for thread in send:
            thread.join()
    except KeyboardInterrupt:
        break

Now, obviously I can't just restart the threads. Nor explicitly kill them. The functions within the threads can theoretically be stopped at any point, so terminate() from multiprocessing was fine.

I was thinking whether something like the following could work (at least PyCharm is fine with it, so it seems to work) or if it creates a memory leak (which I assume), because the threads are never properly closed or deleted, at least as far as I can tell from researching. Again, I'm new to Python, so I don't know anything about this aspect.

Code:

while True:
        try:
            collect1 = Thread(target=collect_data1)
            collect2 = Thread(target=collect_data2)
            send1 = Thread(target=send_data1)
            send2 = Thread(target=send_data2)
            collect = (collect1, collect2)
            send = (send1, send2)
            for thread in collect:
                thread.start()
            for thread in collect:
                thread.join()
            for thread in send:
                thread.start()
            for thread in send:
                thread.join()
        except KeyboardInterrupt:
            break

I feel like this approach seems too good to be true, especially since I've never came across a similar solution during my research.

Anyways, any input is appreciated.

Have a good day.