Example workflow

gistfile1.clj

 ;; Code
 [[:in :concat-names]
  [:concat-names :parse-dates]
  [:parse-dates :time-left]
  [:time-left :notify-near-expiration]
  [:notify-near-expiration :out]
  [:time-left :out]]

;; What the code means
          :in ; Read data line-by-line from a file
           |
     :concat-names ; transform :firstname and :lastname fields into :fullname
           |
     :parse-dates ; try to parse date fields
           |
     :time-left ; Calculate how many days left in current plan
        /     \
to-db :out    :notify-near ; if there is less than a year left on the current plan, send an email
              :-expiration