Megatest

	  exn
	(begin
	  (print "Attempt to safely close sqlite3 db failed. Trying again. exn=" exn)
	  (thread-sleep! 3)
	  (sqlite3:interrupt! db)
	  (db:safely-close-sqlite3-db db stmtcache try-num: (- try-num 1)))
	(if (sqlite3:database? db)
	    (let* ((stmts (if (hash-table? stmt-cache)
	    (let* ((stmts (and stmt-cache (hash-table-ref/default stmt-cache db #f))))
                              (hash-table-ref/default stmt-cache db #f)
                               #f)))
	      (if stmts (map sqlite3:finalize! (hash-table-values stmts)))
	      (sqlite3:finalize! db)
	      #t)
	    #f))))

;; close all opened run-id dbs
(define (db:close-all dbstruct)