It looks okay now.

src/cljs/auto_ap/events.cljs

@@ -1,11 +1,19 @@
 (ns auto-ap.events
   (:require [re-frame.core :as re-frame]
-            [auto-ap.db :as db]))
+            [auto-ap.db :as db]
+            [auto-ap.routes :as routes]
+            [bidi.bidi :as bidi]))
 
 (re-frame/reg-event-db
  ::initialize-db
  (fn  [_ _]
-   db/default-db))
+   (assoc db/default-db
+          :active-page (:handler (bidi/match-route routes/routes (.. js/window -location -pathname))))))
+
+(re-frame/reg-event-db
+ ::set-active-page
+ (fn  [db [_ active-page]]
+   (assoc db :active-page active-page)))
 
 (re-frame/reg-event-db
  ::imported-invoices