Reduce Database load by 'gating' the number of non-critical updates done

Problem Definition

Certain Database updates happen every time a user authenticates with Bitbucket. This can be the result of a REST call using Basic auth, a login using the web UI or an authentication via Git.
Some of these updates don't need to happen on every authentication, if they have occurred very recently.
Examples of this are updating the user's last authenticated timestamp, or recently accessed repository list.

Suggested Solution

"Gate" the number of updates we do, in order to reduce the number of updates in the Database.
This means, only update the last authenticated timestamp and recently accessed repositories a maximum of once every 60 seconds, per user.