ContextWithSignal sets up a signal listener, which will cancel the returned context when an interupt (SIGINT OR SIGTERM) is received.

IsValidReferralCode checks if a referral/root referral code is valid according to a regex pattern.

NewKOLReferralCode creates a new kol referral code.

NewRootReferralCode creates a new root referral code.

SleepContext sleeps for the given duration or until the context is cancelled.

MultiRateLimiter is a rate limiter which can handle cases where there are multiple rate limits that need to be enforced on a single resource.