Revert last few commits, as they changed too much for a hotfix

Revert "Fix readonly banner by making the me-query better cacheable"

This reverts commit 2de9fdcf12.

client/src/components/ReadOnlyBanner.vue

@@ -26,13 +26,28 @@
   </div>
 </template>
 
-<script setup lang="ts">
-import { graphql } from '@/__generated__';
+<script>
+import gql from 'graphql-tag';
 import { LICENSE_ACTIVATION } from '@/router/auth.names';
-import { useQuery } from '@vue/apollo-composable';
-import { computed } from 'vue';
 
-const query = graphql(`
+export default {
+  data() {
+    return {
+      me: {
+        readOnly: false,
+        selectedClass: {
+          readOnly: false,
+        },
+      },
+      licenseActivationLink: {
+        name: LICENSE_ACTIVATION,
+      },
+    };
+  },
+
+  apollo: {
+    me: {
+      query: gql`
         query ReadOnlyQuery {
           me {
             readOnly
@@ -41,34 +56,30 @@ const query = graphql(`
             }
           }
         }
-`);
-
-const { result } = useQuery(query, null, {
+      `,
       fetchPolicy: 'cache-only',
-});
-
-const me = computed(() => {
-  const me = result.value?.me;
-  return (
-    me || {
+      update({ me }) {
+        if (!me) {
+          return {
             readOnly: false,
             selectedClass: {
               readOnly: false,
             },
+          };
         }
-  );
-});
+        return me;
+      },
+    },
+  },
 
-const isReadOnly = computed(() => {
-  return me.value.readOnly || me.value.selectedClass?.readOnly;
-});
-
-const readOnlyText = computed(() => {
-  return me.value.readOnly ? 'Sie besitzen keine aktive Lizenz.' : 'Sie sind in dieser Klasse nicht mehr aktiv.';
-});
-
-const licenseActivationLink = {
-  name: LICENSE_ACTIVATION,
+  computed: {
+    readOnlyText() {
+      return this.me.readOnly ? 'Sie besitzen keine aktive Lizenz.' : 'Sie sind in dieser Klasse nicht mehr aktiv.';
+    },
+    isReadOnly() {
+      return this.me.readOnly || this.me.selectedClass?.readOnly;
+    },
+  },
 };
 </script>
 

client/src/graphql/cache.ts

@@ -61,7 +61,6 @@ const typePolicies = {
     keyFields: ['slug'],
   },
   PrivateUserNode: {
-    keyFields: [], // i should never see anyone else's PrivateUserNode, so this should be a singleton
     fields: {
       language: {
         read() {