Python Key Value Store Design Properly implement an application with a Key Value Database that incorporates the design principles of: Time to Live (TTL) keys Directions: Start from your main.py main.py: You must add 1) Time to Live (TTL) keys (15 points) You must add functionality so that it deletes keys that are more than 3 days old. TTL: I have already provided the code, I just need to know how to implement TTL in the main.py and not have it as a separate python file. .