Clojurians Log v2

I am using Meander to build up nested data structures rather than using it to query nested data. I am able to do roughly what I want with Meander, and it seems like an elegant way to express how I both retrieve the data and build a result. The problem is that I get a result that needs to be merged subsequently. For example I have normalized data from my schools student information system that expresses course, section, meeting and enrollment data (users are associated with courses, courses with sections, and sections with meetings).

(defn retrieve-data-for-user [courses-lookup sections-lookup meetings-lookup  user]
  (m/search {:user user 
             :courses-lookup courses-lookup   ;; Look up course by user-id
             :sections-lookup sections-lookup ;; Look up section by course-id
             :meetings-lookup meetings-lookup } ;; Look up meetings by section-id
      ;; Input------------------------------------------------------
      {:user 
         {"user_id" ?user-id "last_name" ?last-name}
       :courses-lookup 
       {?user-id  (m/scan {"course_id" ?course-id "status" ?status})}
       :sections-lookup
       {?course-id (m/scan {"section_id" ?section-id "name" ?section-name})}
        :meetings-lookup
       {?section-id (m/scan {"Meeting ID" ?meeting-id})}
       }
      
      ;; Output ---- build nested data structure of the form --- 
      ;; {:user :courses [{:sections [{:meetings } ...] }...] }
      {:user 
         {:last-name ?last-name} 
       :courses [{:course-id ?course-id :status ?status 
                     :sections [{:section-name ?section-name
                                 :section-id ?section-id
                                  :meetings [{:meeting-id ?meeting-id}] 
                                 } ]} ]}))

({:user {:last-name "Name"},
  :courses
  [{:course-id "2208-022...",
    :sections
    [{:section-name "Senior Research",
      :meetings [{:meeting-id "2...}]}]}]}
 {:user {:last-name "Name"},
  :courses
  [{:course-id "2208-02288...",
    :sections
    [{:section-name "Syntax I-22917",
      :meetings [{:meeting-id "... "}]}]}]}
 {:user {:last-name "Name"},
  :courses
  [{:course-id "2208-11",
    :sections
    [{:section-name "Ellipsis-24042",
      :meetings [{:meeting-id "2208-116"}]}]}]})

Sorry I haven't been able to look at this. Will try to find time tonight.