diff --git a/ui/src/components/admin/CalendarAssistant.vue b/ui/src/components/admin/CalendarAssistant.vue
index 75a1a79..fe30e10 100644
--- a/ui/src/components/admin/CalendarAssistant.vue
+++ b/ui/src/components/admin/CalendarAssistant.vue
@@ -46,7 +46,7 @@
 </template>
 
 <script lang="ts">
-import { Dictionary } from "@/lib/api";
+import { NumStrDict, objForEach } from "@/lib/api";
 import { Options, Vue } from "vue-class-component";
 
 import MultiModal from "../MultiModal.vue";
@@ -62,7 +62,7 @@ import BulmaDrawer from "../bulma/Drawer.vue";
 })
 export default class extends Vue {
   public day_data: {
-    [day: string]: {
+    [day: number]: {
       part: string;
       image_name: string;
     };
@@ -76,32 +76,32 @@ export default class extends Vue {
 
   public on_open(ready: () => void, fail: () => void): void {
     Promise.all([
-      this.$advent22.api_get<Dictionary>("admin/day_parts"),
-      this.$advent22.api_get<Dictionary>("admin/day_image_names"),
+      this.$advent22.api_get<NumStrDict>("admin/day_parts"),
+      this.$advent22.api_get<NumStrDict>("admin/day_image_names"),
     ])
       .then(([day_parts, day_image_names]) => {
-        const _ensure_day = (day: string) => {
+        const _ensure_day_in_data = (day: number) => {
           if (!(day in this.day_data)) {
             this.day_data[day] = { part: "", image_name: "" };
           }
         };
 
-        for (const day in day_parts) {
-          _ensure_day(day);
-          this.day_data[day].part = day_parts[day];
-        }
+        objForEach(day_parts, (day, part) => {
+          _ensure_day_in_data(day);
+          this.day_data[day].part = part;
+        });
 
-        for (const day in day_image_names) {
-          _ensure_day(day);
-          this.day_data[day].image_name = day_image_names[day];
-        }
+        objForEach(day_image_names, (day, image_name) => {
+          _ensure_day_in_data(day);
+          this.day_data[day].image_name = image_name;
+        });
 
         ready();
       })
       .catch(fail);
   }
 
-  public door_click(day: unknown) {
+  public door_click(day: number) {
     if (this.multi_modal === undefined) return;
     this.multi_modal.show_progress();
 
diff --git a/ui/src/components/admin/ConfigView.vue b/ui/src/components/admin/ConfigView.vue
index 236bcea..8cb35e3 100644
--- a/ui/src/components/admin/ConfigView.vue
+++ b/ui/src/components/admin/ConfigView.vue
@@ -122,7 +122,7 @@
 </template>
 
 <script lang="ts">
-import { ConfigModel, Dictionary, DoorsSaved } from "@/lib/api";
+import { ConfigModel, DoorsSaved, NumStrDict } from "@/lib/api";
 import { DateTime } from "luxon";
 import { Options, Vue } from "vue-class-component";
 
@@ -167,7 +167,7 @@ export default class extends Vue {
       config_file: "sed diam nonumy",
     },
   };
-  public day_parts: Dictionary = {};
+  public day_parts: NumStrDict = {};
   public num_user_doors = 0;
   public next_door: number | null = null;
   public dav_credentials: Credentials = { username: "", password: "" };
@@ -183,7 +183,7 @@ export default class extends Vue {
   public on_open(ready: () => void, fail: () => void): void {
     Promise.all([
       this.$advent22.api_get<ConfigModel>("admin/config_model"),
-      this.$advent22.api_get<Dictionary>("admin/day_parts"),
+      this.$advent22.api_get<NumStrDict>("admin/day_parts"),
       this.$advent22.api_get<DoorsSaved>("user/doors"),
       this.$advent22.api_get<number | null>("user/next_door"),
     ])
diff --git a/ui/src/lib/api.ts b/ui/src/lib/api.ts
index 2b2f32d..3cd22da 100644
--- a/ui/src/lib/api.ts
+++ b/ui/src/lib/api.ts
@@ -23,8 +23,8 @@ export interface ConfigModel {
   };
 }
 
-export interface Dictionary {
-  [day: string]: string;
+export interface NumStrDict {
+  [key: number]: string;
 }
 
 export interface DoorSaved {
@@ -36,3 +36,14 @@ export interface DoorSaved {
 }
 
 export type DoorsSaved = DoorSaved[];
+
+export function objForEach<T>(
+  obj: T,
+  f: (k: keyof T, v: T[keyof T]) => void,
+): void {
+  for (const k in obj) {
+    if (Object.prototype.hasOwnProperty.call(obj, k)) {
+      f(k, obj[k]);
+    }
+  }
+}
diff --git a/ui/src/plugins/advent22.ts b/ui/src/plugins/advent22.ts
index 6b63ceb..e71ff47 100644
--- a/ui/src/plugins/advent22.ts
+++ b/ui/src/plugins/advent22.ts
@@ -24,11 +24,11 @@ export class Advent22 {
     return `//${window.location.hostname}:8000/api`;
   }
 
-  public name_door(day: unknown): string {
+  public name_door(day: number): string {
     return `Türchen ${day}`;
   }
 
-  public format_user_error([reason, endpoint]: unknown[]): string {
+  public format_user_error([reason, endpoint]: [unknown, string]): string {
     let msg =
       "Unbekannter Fehler, bitte wiederholen! Besteht das Problem länger, bitte Admin benachrichtigen!";
     let code = "U";