Add a TODO file.

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+Send mail on success and/or failure.
+
+How to deal with stuck / long-running jobs?
+
+ - We should have instance/timeout settings that allows us to deal
+   with jobs that run too long:
+
+   job "foo" timeout 1 hour ...    # timeout the job after an hour
+   job "bar" single instance ...   # only one instance can run
+   job "bar" kill previous ...     # kill previous if still running