noosfero | event: fix cache_key to update on new events (#626)

[Antonio Terceiro]

New comment for Merge Request 626

https://gitlab.com/noosfero/noosfero/merge_requests/626#note_1644399


Antonio Terceiro

I'm not sure it's a good idea to trigger a database query here, since the whole point of caching is to avoid hitting the database ...

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