watch ttl countdown.

Create short-lived entries in a MemoryCache and watch each key disappear when its time-to-live window closes.

ttl sets the lifetime for every entry created by this cache instance.
The list is sorted by remainingMs, so the next key to expire stays at the top.
When an entry expires, MemoryCache stops returning it and the active list removes it on the next tick.
Changing ttl creates a fresh cache so countdowns, expiration counts, and seed data stay aligned.

pattern · time to live mode · live running source

active · 3

ttl · 10s

next · temp:123

remaining · 3s

expired · 0

time to live 10s

entries disappear when their countdown reaches zero

ttl · 10s

created 3

expired 0

key

value

ttl

temp:123 1:45:57 AM

temporary data

token:xyz 1:46:01 AM

auth token

session:abc 1:46:04 AM

user session data

10s

policy · time to live

ttl · 10s

max size · 20

entries · 3

mode · live

category · expiration-window

sheet · sheet 01 / 01

⟳ to re-run