update task initialization code to prevent rescheduling of tasks.

src/metabase/task.clj

@@ -18,7 +18,8 @@
        set
        (map (fn [events-ns]
               (log/info "\tloading tasks namespace: " events-ns)
-              (require events-ns)))
+              (require events-ns)
+              ((ns-resolve events-ns (symbol "task-init")))))
        dorun))
 
 (defn start-scheduler!

src/metabase/task/sync_databases.clj

@@ -27,8 +27,7 @@
         (catch Exception e
           (log/error "Error syncing database: " (:id database) e))))))
 
-;; this is what actually adds our task to the scheduler
-(when (config/is-prod?)
+(defn task-init []
   (log/info "Submitting sync-database task to scheduler")
   ;; build our job
   (reset! sync-databases-job (jobs/build