Should consider a mechanism to refresh the ads

[dialtone]

Refreshing ads is an important aspect of advertising campaigns and the request happens at a random time between the joining the group and seeing an ad. But those ads change over time and might need to be paused. It would be a good idea to have a refreshing mechanism with some decently short interval (like once a day or a couple of times a day).

[michaelkleber]

That was indeed my intent! I'll clarify how the periodic ad requests and the cache lifetime support this.