Fixed a memory leak
Fixed a memory leak

Using string concatenation for SQL-query composing leads to a memory leak since the value of $microtime is unique for every call what leads to a flooding of the doctrine query cache with unused  query objects. Using proper placeholders for the changing parts of a query fixes this.
heristop/HeriJobQueueBundle,heristop/HeriJobQueueBundle,heristop/HeriJobQueueBundle