Megatest

    (debug:print-info 7 "Current write queue length is " queue-len)

    ;; poll for the write to complete, timeout after 10 seconds
    ;; periodic flushing of the queue is taken care of by 
    ;; db:flush-queue
    (let loop ()
      (thread-sleep! 0.002)
      (thread-sleep! 0.001)
      (mutex-lock! *completed-mutex*)
      (if (hash-table-ref/default *completed-writes* qry-sig #f)
	  (begin
	    (hash-table-delete! *completed-writes* qry-sig)
	    (set! got-it #t)))
      (mutex-unlock! *completed-mutex*)
      (if (and (not got-it)