database doesn't update

[KrullBorg]

sometimes, often, after closing emacs (in a control way or if it "crashes"), the elfeed database it's not updated and when i reopen emacs/elfeed i see feeds unread

i have this function that runs each hour

(defun zak-elfeed-update ()
  "Update elfeed feeds."
  (elfeed-db-unload)
  (elfeed-update)
  (elfeed-db-save-safe)
  (elfeed-db-gc-safe)
  (elfeed-db-save)
)

could it be the problem?

thanks in advance