diff --git a/src/App.vue b/src/App.vue
index 960f099..263a4b8 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -5,19 +5,19 @@ import { RouterView } from 'vue-router'
 import Footer from "@/components/Footer.vue";
 import Sidebar from "@/components/Sidebar.vue";
 import TopBar from "@/components/TopBar.vue";
-import { useUserStore } from "@/stores/userStore";
+import { useSessionStore } from "@/stores/sessionStore";
 
-const userStore = useUserStore();
+const sessionStore = useSessionStore();
 
 const sidebarSize = computed(() => {
-  return userStore.isAnonymous ? '0' : '90px';
+  return sessionStore.isAnonymous ? '0' : '90px';
 });
 </script>
 
 <template>
   <div class="act-layout">
     <TopBar class="act-header"></TopBar>
-    <div class="act-sidebar" v-if="!userStore.isAnonymous">
+    <div class="act-sidebar" v-if="!sessionStore.isAnonymous">
       <Sidebar></Sidebar>
     </div>
     <div class="act-content">
diff --git a/src/components/Sidebar.vue b/src/components/Sidebar.vue
index 02cbe7c..6d0426b 100644
--- a/src/components/Sidebar.vue
+++ b/src/components/Sidebar.vue
@@ -6,15 +6,15 @@ import Avatar from 'primevue/avatar';
 import Menu from "primevue/menu";
 
 import { userActions } from "@/stores/userActionsStore";
-import { useUserStore } from "@/stores/userStore";
+import { useSessionStore } from "@/stores/sessionStore";
 import Navigation from "@/components/Navigation.vue";
 
 
-const userStore = useUserStore();
+const sessionStore = useSessionStore();
 const router = useRouter();
 
 const logout = () => {
-  userStore.logout();
+  sessionStore.logout();
 };
 const profile = () => {
   router.push({name: "profile"});
@@ -42,13 +42,13 @@ const toggle = (event) => { menu.value.toggle(event); };
     <Navigation></Navigation>
     <div class="mt-auto act-avatar">
       <a class="nav-item" @click="toggle">
-        <div v-if="userStore.isAnonymous">
+        <div v-if="sessionStore.isAnonymous">
           <Avatar icon="pi pi-user" size="large" shape="circle" />
         </div>
         <div v-else>
-          <Avatar v-bind:label="userStore.initials" size="large" shape="circle" />
+          <Avatar v-bind:label="sessionStore.initials" size="large" shape="circle" />
         </div>
-        <span class="inline lg:hidden">{{ userStore.user.name }}</span>
+        <span class="inline lg:hidden">{{ sessionStore.user.name }}</span>
       </a>
       <Menu ref="menu" id="overlay_menu" :model="items" :popup="true">
         <template #item="{ item, props }">
@@ -56,7 +56,7 @@ const toggle = (event) => { menu.value.toggle(event); };
             class="flex items-center"
             v-bind:class="{ 'act-useraction': item.needsAuth }"
             v-bind="props.action"
-            v-if="!item.needsAuth || !userStore.isAnonymous">
+            v-if="!item.needsAuth || !sessionStore.isAnonymous">
             <span v-bind:class="item.icon" />
             <span>{{ item.label }}</span>
           </a>
diff --git a/src/components/TopBar.vue b/src/components/TopBar.vue
index 4d8edb5..408413a 100644
--- a/src/components/TopBar.vue
+++ b/src/components/TopBar.vue
@@ -3,7 +3,7 @@ import { ref, watch } from 'vue';
 import { useRouter } from "vue-router";
 import { useRoute } from 'vue-router';
 
-import { useUserStore } from "@/stores/userStore";
+import { useSessionStore } from "@/stores/sessionStore";
 import { userActions } from "@/stores/userActionsStore";
 
 import Button from 'primevue/button';
@@ -13,7 +13,7 @@ import Menu from "primevue/menu";
 const route = useRoute();
 const router = useRouter();
 const page_title = ref();
-const userStore = useUserStore();
+const sessionStore = useSessionStore();
 
 watch(() => route.meta, (newVal, oldVal) => {
   page_title.value = newVal.title;
@@ -23,7 +23,7 @@ const toggle = (event) => {
   menu.value.toggle(event);
 };
 const logout = () => {
-  userStore.logout();
+  sessionStore.logout();
 };
 const profile = () => {
   router.push({name: "profile"});
@@ -79,7 +79,7 @@ const items = ref(allActions);
       <Button
           as="router-link"
           :to="{name: 'login', query: {next: route.fullPath }}"
-          v-if="userStore.isAnonymous">
+          v-if="sessionStore.isAnonymous">
         <i class="pi pi-sign-in" />
         <span>Login</span>
       </Button>
@@ -108,7 +108,7 @@ const items = ref(allActions);
               class="flex items-center"
               v-bind:class="{ 'act-useraction': item.needsAuth }"
               v-bind="props.action"
-              v-if="!item.needsAuth || !userStore.isAnonymous">
+              v-if="!item.needsAuth || !sessionStore.isAnonymous">
             <span v-bind:class="item.icon" />
             <span>{{ item.label }}</span>
           </a>
diff --git a/src/router/index.ts b/src/router/index.ts
index 29578bb..8129a6f 100644
--- a/src/router/index.ts
+++ b/src/router/index.ts
@@ -1,6 +1,6 @@
 import { createRouter, createWebHistory } from 'vue-router'
 
-import { useUserStore } from "@/stores/userStore";
+import { useSessionStore } from "@/stores/sessionStore";
 import AboutView from '../views/AboutView.vue'
 import HomeView from '../views/HomeView.vue'
 import LoginView from '../views/LoginView.vue'
@@ -73,18 +73,18 @@ const router = createRouter({
 })
 
 router.beforeEach((to, from) => {
-  const userStore= useUserStore();
-  if (userStore.isAnonymous && to.name == 'home') {
+  const sessionStore= useSessionStore();
+  if (sessionStore.isAnonymous && to.name == 'home') {
     return {name: 'welcome'};
-  } else if (!userStore.isAnonymous && to.name == 'welcome') {
+  } else if (!sessionStore.isAnonymous && to.name == 'welcome') {
     return {name: 'home'};
   } else if (to.name == 'profile' && to.params.username == "") {
-    if (userStore.isAnonymous) {
+    if (sessionStore.isAnonymous) {
       return {name: 'home'};
     } else {
       // Send to "my" profile page.
       return {name: 'profile', params: {
-          username: userStore.user.username,
+          username: sessionStore.user.username,
         }};
     }
   }
diff --git a/src/stores/sessionStore.ts b/src/stores/sessionStore.ts
new file mode 100644
index 0000000..2128df7
--- /dev/null
+++ b/src/stores/sessionStore.ts
@@ -0,0 +1,65 @@
+import {acceptHMRUpdate, defineStore} from 'pinia'
+
+
+export interface User {
+  name: string,
+  sticker_ids: string[],
+  username: string | null,
+};
+
+const anonymous: User = {
+  name: 'Anonymous',
+  sticker_ids: [],
+  username: null,
+};
+
+export interface State {
+  user: User,
+}
+
+export const useSessionStore = defineStore('session', {
+  actions: {
+    async login(username: string, password: string) {
+      const response = await fetch(
+        `/api/login/${username}`,  // TODO: Should not be in path.
+        {
+          method: 'POST',
+        },
+      );
+      const json = await response.json();
+      console.log('login', json);
+      // this.user.name = json.name;
+      this.user = {
+        name: json.name,
+        sticker_ids: json.sticker_ids,
+        username: json.username,
+      };
+    },
+    logout() {
+      console.log('logout');
+      // TODO: Tell server.
+      this.user = anonymous;
+      // this.hasChanged = true;
+      // this.user.name = 'Anonymous';
+      // this.$reset();
+      // this.$patch({user: anonymous});
+    },
+  },
+  getters: {
+    initials: (state: State): string => {
+      return state.user.name[0] || '';
+    },
+    isAnonymous: (state: State): boolean => {
+      return state.user.name === 'Anonymous';
+    },
+  },
+  state: (): State =>  {
+    return {
+      user: anonymous,
+    };
+  },
+})
+
+if (import.meta.hot) {
+  import.meta.hot.accept(acceptHMRUpdate(useSessionStore, import.meta.hot))
+}
diff --git a/src/stores/stickerStore.ts b/src/stores/stickerStore.ts
index 762ee7d..b79b04c 100644
--- a/src/stores/stickerStore.ts
+++ b/src/stores/stickerStore.ts
@@ -45,7 +45,7 @@ export const useStickerStore = defineStore('sticker', {
       }
       this.put(this.sticker.uuid);
       const userStore= useUserStore();
-      userStore.addSticker(this.sticker.uuid);
+      userStore.addSticker(user.username, this.sticker.uuid);
     },
   },
   state: () =>  {
diff --git a/src/stores/userStore.ts b/src/stores/userStore.ts
index ee4a684..e330f3c 100644
--- a/src/stores/userStore.ts
+++ b/src/stores/userStore.ts
@@ -9,21 +9,17 @@ export interface User {
   username: string | null,
 };
 
-const anonymous: User = {
-  name: 'Anonymous',
-  sticker_ids: [],
-  username: null,
-};
-
 export interface State {
-  user: User,
   users: User[],
 }
 
 export const useUserStore = defineStore('user', {
   actions: {
-    addSticker(uuid: string) {
-      this.user.sticker_ids.push(uuid);
+    addSticker(username: string, uuid: string) {
+      let user = this.getUser(username);
+      if (user) {
+        user.sticker_ids.push(uuid);
+      }
     },
     async fetch(username: string) {
       let user = this.getUser(username);
@@ -42,39 +38,8 @@ export const useUserStore = defineStore('user', {
         stickersStore.fetch(sticker_id);
       })
     },
-    async login(username: string, password: string) {
-      const response = await fetch(
-        `/api/login/${username}`,  // TODO: Should not be in path.
-        {
-          method: 'POST',
-        },
-      );
-      const json = await response.json();
-      console.log('login', json);
-      // this.user.name = json.name;
-      this.user = {
-        name: json.name,
-        sticker_ids: json.sticker_ids,
-        username: json.username,
-      };
-    },
-    logout() {
-      console.log('logout');
-      // TODO: Tell server.
-      this.user = anonymous;
-      // this.hasChanged = true;
-      // this.user.name = 'Anonymous';
-      // this.$reset();
-      // this.$patch({user: anonymous});
-    },
   },
   getters: {
-    initials: (state: State): string => {
-      return state.user.name[0] || '';
-    },
-    isAnonymous: (state: State): boolean => {
-      return state.user.name === 'Anonymous';
-    },
     getUser: (state: State) => {
       return (username: string): User | null => {
         return state.users.find((user: User) => user.username === username)
@@ -83,7 +48,6 @@ export const useUserStore = defineStore('user', {
   },
   state: (): State =>  {
     return {
-      user: anonymous,
       users: [],
     };
   },
diff --git a/src/views/LoginView.vue b/src/views/LoginView.vue
index b9e1cb1..8006642 100644
--- a/src/views/LoginView.vue
+++ b/src/views/LoginView.vue
@@ -8,9 +8,10 @@ import InputText from 'primevue/inputtext';
 import Message from 'primevue/message';
 import Toast from 'primevue/toast';
 
-import { useUserStore } from "@/stores/userStore";
+import { useSessionStore } from "@/stores/sessionStore";
 
-const userStore = useUserStore();
+
+const sessionStore = useSessionStore();
 const username = ref();
 const password = ref();
 const router = useRouter();
@@ -22,7 +23,7 @@ function handleLogin({ valid }) {
   if (!valid) {
     return;
   }
-  userStore.login(username.value, username.value).then(() => {
+  sessionStore.login(username.value, username.value).then(() => {
     router.push(next);
   });
 }
diff --git a/src/views/ProfileView.vue b/src/views/ProfileView.vue
index 15e6b58..5408d6b 100644
--- a/src/views/ProfileView.vue
+++ b/src/views/ProfileView.vue
@@ -11,10 +11,12 @@ import Panel from 'primevue/panel';
 import Timeline from 'primevue/timeline';
 
 import Sticker from "@/components/Sticker.vue";
+import {useSessionStore} from "@/stores/sessionStore";
 import {type User, useUserStore} from "@/stores/userStore";
 import { useStickersStore } from "@/stores/stickersStore";
 
 
+const sessionStore = useSessionStore();
 const userStore = useUserStore();
 const { getUser } = userStore;
 const route = useRoute();
@@ -29,7 +31,7 @@ onMounted(async () => {
 });
 
 const myPage = computed(() => {
-  return !userStore.isAnonymous && userStore.user.username == user?.value.username;
+  return !sessionStore.isAnonymous && sessionStore.user.username == user.value?.username;
 });
 
 const meterValue = ref([
diff --git a/src/views/StickerView.vue b/src/views/StickerView.vue
index c07e7a2..bcc5427 100644
--- a/src/views/StickerView.vue
+++ b/src/views/StickerView.vue
@@ -4,11 +4,11 @@ import Button from 'primevue/button';
 import Panel from 'primevue/panel';
 import Sticker from "@/components/Sticker.vue";
 import { useRoute } from 'vue-router';
-import { useUserStore } from "@/stores/userStore";
+import { useSessionStore } from "@/stores/sessionStore";
 import { useStickerStore } from "@/stores/stickerStore";
 
+const sessionStore = useSessionStore();
 const stickerStore = useStickerStore();
-const userStore = useUserStore();
 
 const route = useRoute();
 const uuid = ref<string>(route.params.uuid as string);
@@ -28,7 +28,7 @@ const second = computed(() => {
 })
 
 function claimSticker() {
-  stickerStore.setOwner(userStore.user);
+  stickerStore.setOwner(sessionStore.user);
 }
 
 </script>
@@ -56,12 +56,12 @@ function claimSticker() {
           />
         </div>
         <Button
-            v-bind:disabled="userStore.isAnonymous"
+            v-bind:disabled="sessionStore.isAnonymous"
             v-if="stickerStore.sticker?.owner == null"
             v-on:click="claimSticker">
           This is my sticker!
         </Button>
-        <span v-if="userStore.isAnonymous">
+        <span v-if="sessionStore.isAnonymous">
             Log in to claim your sticker.
           </span>
       </div>