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(define (db:run-id->dbname run-id)
  (cond
   ((number? run-id) (conc ".db/" (modulo run-id 100) ".db"))
   ((not run-id)     (conc ".db/main.db"))
   (else             run-id)))

(define (dbfile:get-subdb dbstruct run-id)
  (let* ((dbfname (db:run-id->dbname run-id)))
    (hash-table-ref/default (dbr:dbstruct-subdbs dbstruct) dbfname #f)))

;; Get/open a database
;;    if run-id => get run specific db
;;    if #f     => get main db
;;    if run-id is a string treat it as a filename
;;    if db already open - return inmem
;;    if db not open, open inmem, rundb and sync then return inmem
;;    inuse gets set automatically for rundb's
;;
(define (dbfile:get-dbh dbstruct run-id) ;; RENAME TO db:get-dbh
  (let* ((subdb (dbfile:get-subdb dbstruct run-id)))
    (if (stack? (dbr:subdb-dbstack subdb))
	(if (stack-empty? (dbr:subdb-dbstack subdb))
	    #f
	    (stack-pop! (dbr:subdb-dbstack subdb)))
	#f)))

(define (dbfile:add-dbh dbstruct run-id db)
(define (dbfile:add-dbh dbstruct run-id dbh)
  (let* ((subdb (dbfile:get-subdb dbstruct run-id)))
    (if (not (stack? (dbr:subdb-dbstack subdb)))
	(dbr:subdb-dbstack-set! subdb (make-stack)))
    
    (stack-push! (dbr:subdb-dbstack subdb) dbh)))
	

)