Megatest

	(begin
	  (print "Adding megatest-version to metadata")
	  (sqlite3:execute db (db:set-var db "MEGATEST_VERSION" megatest-version))))
     ;;      (if (< mver 1.18)
     ;; 	 (begin
     ;; 	   (print "Adding tags column to tests table")
     ;; 	   (sqlite3:execute db "ALTER TABLE tests ADD COLUMN tags TEXT DEFAULT '';")))
     (if (< mver 1.20)
     (if (< mver 1.21)
	 (begin
	   (sqlite3:execute db "CREATE TABLE test_meta (id INTEGER PRIMARY KEY,
                                     testname    TEXT DEFAULT '',
                                     author      TEXT DEFAULT '',
                                     owner       TEXT DEFAULT '',
                                     description TEXT DEFAULT '',
                                     reviewed    TIMESTAMP,

    (if (string? res)
	(let ((valnum (string->number res)))
	  (if valnum valnum res))
	res)))

(define (db:set-var db var val)
  (sqlite3:execute db "INSERT OR REPLACE INTO metadat (var,val) VALUES (?,?);" var val))

;; use a global for some primitive caching, it is just silly to re-read the db 
;; over and over again for the keys since they never change

(define *db-keys* #f)

(define (db-get-keys db)
  (if *db-keys* *db-keys* 
  (let ((res '()))
    (sqlite3:for-each-row 
     (lambda (key keytype)
       (set! res (cons (vector key keytype) res)))
     db
     "SELECT fieldname,fieldtype FROM keys ORDER BY id DESC;")
    res))
      (let ((res '()))
	(sqlite3:for-each-row 
	 (lambda (key keytype)
	   (set! res (cons (vector key keytype) res)))
	 db
	 "SELECT fieldname,fieldtype FROM keys ORDER BY id DESC;")
	(set! *db-keys* res)
	res)))

(define db:get-keys db-get-keys)

(define-inline (db:get-header vec)(vector-ref vec 0))
(define-inline (db:get-rows   vec)(vector-ref vec 1))

(define (db:get-value-by-header row header field)
  (if (null? header) #f
      (let loop ((hed (car header))

			run-id 
			test-name
			pth 
			;; (conc "," (string-intersperse tags ",") ",")
			))
     item-paths )))

;; get the previous record for when this test was run where all keys match but runname
;;  (define db (open-db))
;;  (test-set-status! db 2 "runfirst" "COMPLETED" "PASS" "summer")
(define (test:get-previous-test-run-records db run-id test-name item-path)
  (let* ((keys    (db:get-keys db))
	 (selstr  (string-intersperse (map (lambda (x)(vector-ref x 0)) keys) ","))
	 (qrystr  (string-intersperse (map (lambda (x)(conc (vector-ref x 0) "=?")) keys) " AND "))
	 (keyvals #f))
    ;; first look up the key values from the run selected by run-id
    (sqlite3:for-each-row 
     (lambda (a . b)
       (set! keyvals (cons a b)))
     db
     (conc "SELECT " selstr " FROM runs WHERE run_id=? ORDER BY event_time DESC;"))
    (if (not keyvals)
	#f
	(let ((prev-run-ids '()))
	  (apply sqlite3:for-each-row
		 (lambda (id)
		   (set! prev-run-ids (cons id prev-run-ids)))
		 db
		 (conc "SELECT run_id FROM runs WHERE " qrystr ";"))
	  ;; for each run starting with the most recent look to see if there is a matching test
	  ;; if found then return that matching test record
	  (if (null? prev-run-ids) #f
	      (let loop ((hed (car prev-run-ids))
			 (tal (cdr prev-run-ids)))
		(let ((results (db-get-tests-for-run db test-name item-path)))
		  (if (and (null? results)
			   (not (null? tal)))
		      (loop (car tal)(cdr tal))
		      (car results)))))))))
    

(define (test-set-status! db run-id test-name state status itemdat-or-path comment dat)
  (let ((item-path (if (string? itemdat-or-path) itemdat-or-path (item-list->path itemdat-or-path)))
	(otherdat  (if dat dat (make-hash-table))))
	(otherdat  (if dat dat (make-hash-table)))
	;; before proceeding we must find out if the previous test (where all keys matched except runname)
	;; was WAIVED if this test is FAIL
	(waived   (if (equal? status "FAIL")
		      (let ((prev-test (test:get-previous-test-run-records db run-id test-name item-path)))
			(if (and prev-test (not (null? prev-test))) ;; true if we found a previous test in this run series
			    (let ((prev-status (db:test-get-status   prev-test))
				  (prev-state  (db:test-get-state    prev-test))
				  (prev-comment (db:test-get-comment prev-test)))
			      (if (and (equal? prev-status "COMPLETED")
				       (equal? prev-state  "WAIVED"))
				  prev-comment ;; waived is either the comment or #f
				  #f))
			    #f))
		      #f)))

    ;; update the primary record IF state AND status are defined
    (if (and state status)
	(sqlite3:execute db "UPDATE tests SET state=?,status=?,event_time=strftime('%s','now') WHERE run_id=? AND testname=? AND item_path=?;" 
			 state status run-id test-name item-path))
    ;; add metadata (need to do this way to avoid SQL injection issues)
    ;; :value
    (let ((val (hash-table-ref/default otherdat ":value" #f)))

		       (debug:print 1 "NOTE: " new-test-name " is already running or was explictly killed, use -force to launch it."))
		      ((LAUNCHED REMOTEHOSTSTART RUNNING)  
		       (if (> (- (current-seconds)(+ (db:test-get-event_time testdat)
						     (db:test-get-run_duration testdat)))
			      100) ;; i.e. no update for more than 100 seconds
			   (begin
			     (debug:print 0 "WARNING: Test " test-name " appears to be dead. Forcing it to state INCOMPLETE and status STUCK/DEAD")
			     (test-set-status! db run-id test-name "INCOMPLETE" "STUCK/DEAD" itemdat "Test is stuck or dead"))
			     (test-set-status! db run-id test-name "INCOMPLETE" "STUCK/DEAD" itemdat "Test is stuck or dead" #f))
			   (debug:print 2 "NOTE: " test-name " is already running")))
		      (else       (debug:print 0 "ERROR: Failed to launch test " new-test-name ". Unrecognised state " (test:get-state testdat))))))
	      (if (not (null? tal))
		  (loop (car tal)(cdr tal)))))))))

(define (run-waiting-tests db)
  (let ((numtries           0)