Redmine

On setups where a lot of logins happen (e.g. when heavily using the API with Basic Auth credentials), access to the@ users@ table can get contentioned due to the many parallel write queries to the table during each request as each requests sets the last_login_on column of the user to the current date in User.try_to_login. This can result in deadlocks or general long lock waits on the database since all of these update queries will effectively be serialized per user.

By updating the last_login_on column less often, we can drastically reduce this contention. The attached patch implements this by only updating the last_login_on column once per minute.