treasure-data / perfectqueue / 84

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Introduce new timeout model

* Separate the area where a DELETE query locks from the area where
  acquire query touchs. By this change DELETE query and acquire query
  can run parallel.
** finished task was SET timeout=now+retention_time, created_at=NULL.
   This intoroduces DELETE_OFFSET=10_0000_0000, and change as
   SET timeout=now-DELETE_OFFSET+retention_time, created_at=NULL.
** To separate tasks to be acquired from tasks to be deleted,
   introduce EVENT_HORIZON(=13_0000_0000, 2011-03-13 07:06:40 UTC).
   Now it doesn't check prior that.

NOTE: this change requires migration process like actual DELETE query
see WHERE timeout <= now AND created_at IS NULL.

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