Add option to log completed jobs about delayed_job

[kbrock]

we needed this, and have it in my branch. I will try and close the gap between the two branches and see if you can get what you want.

[bkeepers]

That would be great.

[kbrock]

You've made some great changes to the core. So I needed to do quite a bit of re-factoring to incorporate my changes.

Hope you can use some of it.

[bkeepers]

@kbrock: thanks for the pull request, but I'm going to need the successful jobs to be stored in a separate table. Any app that processes a decent amount of jobs will quickly be brought to its knees if it keeps all of the jobs ever performed in a single table.

[johnleroux]

I use a on delete trigger (Firebird database) to save any job being deleted to another table. Successfull and permanently failed jobs.

[tute]

Here is one approach: http://github.com/collectiveidea/delayed_job/pull/126

[kbrock]

This solution always irked me.
It followed suit with the previous logging options.
It was the easiest way for me to get done what we needed to get done.
And a job to delete all jobs once a month met our needs. ($ vs effort)

I like the solution from @tute.

I'm using resque now. So won't be working on this any time soon.