# Redis time-to-live = 2s, max-messages-per-conversation = 4

saved 2 messages; readable now: U:u1 | A:a1
3 seconds later:        (gone: Redis expired the keys)

saved 6 messages with max-messages-per-conversation=4, read back 4:
  U:u1 | A:a1 | U:u2 | A:a2
keys in Redis for it: 7