* Adds dbmanager cache into an examle
When I used the RBAC first time, I didn't know about the dbmanager caching. I was relaying on the examples only. Then I saw many queries in my logs and started searching to eventually find the cache property.
I think there isn't a situation, when someone doesn't use caching for dbmanager rbac, so i'ts very helpful to put it in the example above.
Hope I'm correct.
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