Implement time keeping, avoid lazily deleting expired keys

[ujjwal-kr]

Need to make some cycles which checks from another thread for expired keys more like garbage collection for the database.
Cannot afford to delete keys at random times because the e2e will fail, so the cycle needs to be ran after each millisecond?
Too much CPU usage.

[ujjwal-kr]

implemented expire on GET

[ujjwal-kr]

solution is to lazily expire keys but also keep a thread running to check the db for expired keys after a significant amount of time