diff --git a/backend/src/controllers/learning-paths.ts b/backend/src/controllers/learning-paths.ts
index 9a03e681..5c1fb8e1 100644
--- a/backend/src/controllers/learning-paths.ts
+++ b/backend/src/controllers/learning-paths.ts
@@ -68,13 +68,14 @@ export async function getLearningPaths(req: Request, res: Response): Promise<voi
 function postOrPutLearningPath(isPut: boolean): (req: AuthenticatedRequest, res: Response) => Promise<void> {
     return async (req, res) => {
         const path: LearningPath = req.body;
+        const teacher = await getTeacher(req.auth!.username);
         if (isPut) {
             if (req.params.hruid !== path.hruid || req.params.language !== path.language) {
                 throw new BadRequestException("id_not_matching_query_params");
             }
+            await learningPathService.deleteLearningPath({hruid: path.hruid, language: path.language as Language});
         }
-        const teacher = await getTeacher(req.auth!.username);
-        res.json(await learningPathService.createNewLearningPath(path, [teacher], isPut));
+        res.json(await learningPathService.createNewLearningPath(path, [teacher]));
     }
 }
 
diff --git a/backend/src/data/content/learning-path-repository.ts b/backend/src/data/content/learning-path-repository.ts
index 503a6287..81b0df99 100644
--- a/backend/src/data/content/learning-path-repository.ts
+++ b/backend/src/data/content/learning-path-repository.ts
@@ -8,7 +8,10 @@ import { EntityAlreadyExistsException } from '../../exceptions/entity-already-ex
 
 export class LearningPathRepository extends DwengoEntityRepository<LearningPath> {
     public async findByHruidAndLanguage(hruid: string, language: Language): Promise<LearningPath | null> {
-        return this.findOne({ hruid: hruid, language: language }, { populate: ['nodes', 'nodes.transitions'] });
+        return this.findOne(
+            { hruid: hruid, language: language },
+            { populate: ['nodes', 'nodes.transitions', 'admins'] }
+        );
     }
 
     /**
@@ -24,7 +27,7 @@ export class LearningPathRepository extends DwengoEntityRepository<LearningPath>
                 language: language,
                 $or: [{ title: { $like: `%${query}%` } }, { description: { $like: `%${query}%` } }],
             },
-            populate: ['nodes', 'nodes.transitions'],
+            populate: ['nodes', 'nodes.transitions', 'admins'],
         });
     }
 
@@ -37,7 +40,8 @@ export class LearningPathRepository extends DwengoEntityRepository<LearningPath>
                 admins: {
                     username: adminUsername
                 }
-            }
+            },
+            populate: ['nodes', 'nodes.transitions', 'admins']
         });
     }
 
diff --git a/backend/src/entities/content/learning-path-node.entity.ts b/backend/src/entities/content/learning-path-node.entity.ts
index fd870dcd..08543d22 100644
--- a/backend/src/entities/content/learning-path-node.entity.ts
+++ b/backend/src/entities/content/learning-path-node.entity.ts
@@ -1,4 +1,4 @@
-import { Collection, Entity, Enum, ManyToOne, OneToMany, PrimaryKey, Property, Rel } from '@mikro-orm/core';
+import { Cascade, Collection, Entity, Enum, ManyToOne, OneToMany, PrimaryKey, Property, Rel } from '@mikro-orm/core';
 import { LearningPath } from './learning-path.entity.js';
 import { LearningPathTransition } from './learning-path-transition.entity.js';
 import { Language } from '@dwengo-1/common/util/language';
@@ -26,7 +26,7 @@ export class LearningPathNode {
     @Property({ type: 'bool' })
     startNode!: boolean;
 
-    @OneToMany({ entity: () => LearningPathTransition, mappedBy: 'node' })
+    @OneToMany({ entity: () => LearningPathTransition, mappedBy: 'node', cascade: [Cascade.ALL] })
     transitions!: Collection<LearningPathTransition>;
 
     @Property({ length: 3 })
diff --git a/backend/src/entities/content/learning-path.entity.ts b/backend/src/entities/content/learning-path.entity.ts
index 1b96d8ea..36e13766 100644
--- a/backend/src/entities/content/learning-path.entity.ts
+++ b/backend/src/entities/content/learning-path.entity.ts
@@ -1,4 +1,4 @@
-import { Collection, Entity, Enum, ManyToMany, OneToMany, PrimaryKey, Property } from '@mikro-orm/core';
+import { Cascade, Collection, Entity, Enum, ManyToMany, OneToMany, PrimaryKey, Property } from '@mikro-orm/core';
 import { Teacher } from '../users/teacher.entity.js';
 import { LearningPathRepository } from '../../data/content/learning-path-repository.js';
 import { LearningPathNode } from './learning-path-node.entity.js';
@@ -24,6 +24,6 @@ export class LearningPath {
     @Property({ type: 'blob', nullable: true })
     image: Buffer | null = null;
 
-    @OneToMany({ entity: () => LearningPathNode, mappedBy: 'learningPath' })
+    @OneToMany({ entity: () => LearningPathNode, mappedBy: 'learningPath', cascade: [Cascade.ALL] })
     nodes: Collection<LearningPathNode> = new Collection<LearningPathNode>(this);
 }
diff --git a/backend/src/middleware/auth/checks/learning-path-auth-checks.ts b/backend/src/middleware/auth/checks/learning-path-auth-checks.ts
index 64e51416..95a94d44 100644
--- a/backend/src/middleware/auth/checks/learning-path-auth-checks.ts
+++ b/backend/src/middleware/auth/checks/learning-path-auth-checks.ts
@@ -1,3 +1,4 @@
+import { Language } from "@dwengo-1/common/util/language";
 import learningPathService from "../../../services/learning-paths/learning-path-service";
 import { authorize } from "../auth";
 import { AuthenticatedRequest } from "../authenticated-request";
@@ -5,8 +6,8 @@ import { AuthenticationInfo } from "../authentication-info";
 
 export const onlyAdminsForLearningPath = authorize(async (auth: AuthenticationInfo, req: AuthenticatedRequest) => {
     const adminsForLearningPath = await learningPathService.getAdmins({
-        hruid: req.body.hruid,
-        language: req.body.language
+        hruid: req.params.hruid,
+        language: req.params.language as Language
     });
     return adminsForLearningPath && adminsForLearningPath.includes(auth.username);
 });
diff --git a/backend/src/routes/learning-paths.ts b/backend/src/routes/learning-paths.ts
index b2e67d57..525ec34f 100644
--- a/backend/src/routes/learning-paths.ts
+++ b/backend/src/routes/learning-paths.ts
@@ -1,7 +1,7 @@
 import express from 'express';
 import { deleteLearningPath, getLearningPaths, postLearningPath, putLearningPath } from '../controllers/learning-paths.js';
 import { teachersOnly } from '../middleware/auth/auth.js';
-import { onlyAdminsForLearningObject } from '../middleware/auth/checks/learning-object-auth-checks.js';
+import { onlyAdminsForLearningPath } from '../middleware/auth/checks/learning-path-auth-checks.js';
 
 const router = express.Router();
 
@@ -27,7 +27,7 @@ const router = express.Router();
 router.get('/', getLearningPaths);
 router.post('/', teachersOnly, postLearningPath)
 
-router.put('/:hruid/:language', onlyAdminsForLearningObject, putLearningPath);
-router.delete('/:hruid/:language', onlyAdminsForLearningObject, deleteLearningPath);
+router.put('/:hruid/:language', onlyAdminsForLearningPath, putLearningPath);
+router.delete('/:hruid/:language', onlyAdminsForLearningPath, deleteLearningPath);
 
 export default router;
diff --git a/backend/src/services/learning-objects/learning-object-service.ts b/backend/src/services/learning-objects/learning-object-service.ts
index f70b88b2..dca719f8 100644
--- a/backend/src/services/learning-objects/learning-object-service.ts
+++ b/backend/src/services/learning-objects/learning-object-service.ts
@@ -72,6 +72,8 @@ const learningObjectService = {
             learningObject.hruid = getEnvVar(envVars.UserContentPrefix) + learningObject.hruid;
         }
 
+        await learningObjectRepository.getEntityManager().flush();
+
         // Lookup the admin teachers based on their usernames and add them to the admins of the learning object.
         const teacherRepo = getTeacherRepository();
         const adminTeachers = await Promise.all(
diff --git a/backend/src/services/learning-paths/database-learning-path-provider.ts b/backend/src/services/learning-paths/database-learning-path-provider.ts
index ac525831..0bcd0922 100644
--- a/backend/src/services/learning-paths/database-learning-path-provider.ts
+++ b/backend/src/services/learning-paths/database-learning-path-provider.ts
@@ -16,6 +16,9 @@ import { Language } from '@dwengo-1/common/util/language';
 import { Group } from '../../entities/assignments/group.entity';
 import { Collection } from '@mikro-orm/core';
 import { v4 } from 'uuid';
+import { getLogger } from '../../logging/initalize.js';
+
+const logger = getLogger();
 
 /**
  * Fetches the corresponding learning object for each of the nodes and creates a map that maps each node to its
@@ -38,8 +41,13 @@ async function getLearningObjectsForNodes(nodes: Collection<LearningPathNode>):
             )
         )
     );
-    if (Array.from(nullableNodesToLearningObjects.values()).some((it) => it === null)) {
-        throw new Error('At least one of the learning objects on this path could not be found.');
+
+    // Ignore all learning objects that cannot be found such that the rest of the learning path keeps working.
+    for (const [key, value] of nullableNodesToLearningObjects) {
+        if (value === null) {
+            logger.warn(`Learning object ${key.learningObjectHruid}/${key.language}/${key.version} not found!`);
+            nullableNodesToLearningObjects.delete(key);
+        }
     }
     return nullableNodesToLearningObjects as Map<LearningPathNode, FilteredLearningObject>;
 }
@@ -102,7 +110,14 @@ async function convertNode(
                 !personalizedFor || // If we do not want a personalized learning path, keep all transitions
                 isTransitionPossible(trans, optionalJsonStringToObject(lastSubmission?.content)) // Otherwise remove all transitions that aren't possible.
         )
-        .map((trans, i) => convertTransition(trans, i, nodesToLearningObjects));
+        .map((trans, i) => {
+            try {
+                return convertTransition(trans, i, nodesToLearningObjects)
+            } catch (_: unknown) {
+                logger.error(`Transition could not be resolved: ${JSON.stringify(trans)}`);
+                return undefined; // Do not crash on invalid transitions, just ignore them so the rest of the learning path keeps working.
+            }
+        }).filter(it => it);
     return {
         _id: learningObject.uuid,
         language: learningObject.language,
diff --git a/backend/src/services/learning-paths/learning-path-service.ts b/backend/src/services/learning-paths/learning-path-service.ts
index 53c084fd..7ee60ac3 100644
--- a/backend/src/services/learning-paths/learning-path-service.ts
+++ b/backend/src/services/learning-paths/learning-path-service.ts
@@ -130,13 +130,12 @@ const learningPathService = {
      * Add a new learning path to the database.
      * @param dto Learning path DTO from which the learning path will be created.
      * @param admins Teachers who should become an admin of the learning path.
-     * @param allowReplace If this is set to true and there is already a learning path with the same identifier, it is replaced.
      * @returns the created learning path.
      */
-    async createNewLearningPath(dto: LearningPath, admins: TeacherDTO[], allowReplace = false): Promise<LearningPathEntity> {
+    async createNewLearningPath(dto: LearningPath, admins: TeacherDTO[]): Promise<LearningPathEntity> {
         const repo = getLearningPathRepository();
         const path = mapToLearningPath(dto, admins);
-        await repo.save(path, { preventOverwrite: allowReplace });
+        await repo.save(path, { preventOverwrite: true });
         return path;
     },
 
diff --git a/common/src/interfaces/learning-content.ts b/common/src/interfaces/learning-content.ts
index 582e0086..a3e5dacb 100644
--- a/common/src/interfaces/learning-content.ts
+++ b/common/src/interfaces/learning-content.ts
@@ -25,8 +25,8 @@ export interface LearningObjectNode {
     language: Language;
     start_node?: boolean;
     transitions: Transition[];
-    created_at: string;
-    updatedAt: string;
+    created_at?: string;
+    updatedAt?: string;
     done?: boolean; // True if a submission exists for this node by the user for whom the learning path is customized.
 }
 
diff --git a/frontend/src/controllers/learning-paths.ts b/frontend/src/controllers/learning-paths.ts
index f8b82bef..4a8a1824 100644
--- a/frontend/src/controllers/learning-paths.ts
+++ b/frontend/src/controllers/learning-paths.ts
@@ -1,8 +1,8 @@
 import { BaseController } from "@/controllers/base-controller.ts";
-import { LearningPath } from "@/data-objects/learning-paths/learning-path.ts";
 import type { Language } from "@/data-objects/language.ts";
+import { LearningPath } from "@/data-objects/learning-paths/learning-path";
 import { single } from "@/utils/response-assertions.ts";
-import type { LearningPathDTO } from "@/data-objects/learning-paths/learning-path-dto.ts";
+import type { LearningPath as LearningPathDTO } from "@dwengo-1/common/interfaces/learning-content";
 
 export class LearningPathController extends BaseController {
     constructor() {
diff --git a/frontend/src/data-objects/learning-paths/learning-path-node.ts b/frontend/src/data-objects/learning-paths/learning-path-node.ts
index 99bac8db..de977233 100644
--- a/frontend/src/data-objects/learning-paths/learning-path-node.ts
+++ b/frontend/src/data-objects/learning-paths/learning-path-node.ts
@@ -1,5 +1,5 @@
 import type { Language } from "@/data-objects/language.ts";
-import type { LearningPathNodeDTO } from "@/data-objects/learning-paths/learning-path.ts";
+import type { LearningObjectNode as LearningPathNodeDTO } from "@dwengo-1/common/interfaces/learning-content";
 
 export class LearningPathNode {
     public readonly learningobjectHruid: string;
@@ -14,7 +14,7 @@ export class LearningPathNode {
         learningobjectHruid: string;
         version: number;
         language: Language;
-        transitions: { next: LearningPathNode; default: boolean }[];
+        transitions: { next: LearningPathNode; default?: boolean }[];
         createdAt: Date;
         updatedAt: Date;
         done?: boolean;
@@ -22,7 +22,7 @@ export class LearningPathNode {
         this.learningobjectHruid = options.learningobjectHruid;
         this.version = options.version;
         this.language = options.language;
-        this.transitions = options.transitions;
+        this.transitions = options.transitions.map(it => ({ next: it.next, default: it.default ?? false }));
         this.createdAt = options.createdAt;
         this.updatedAt = options.updatedAt;
         this.done = options.done || false;
@@ -50,8 +50,8 @@ export class LearningPathNode {
                     return undefined;
                 })
                 .filter((it) => it !== undefined),
-            createdAt: new Date(dto.created_at),
-            updatedAt: new Date(dto.updatedAt),
+            createdAt: dto.created_at ? new Date(dto.created_at) : new Date(),
+            updatedAt: dto.updatedAt ? new Date(dto.updatedAt) : new Date(),
             done: dto.done,
         });
     }
diff --git a/frontend/src/data-objects/learning-paths/learning-path.ts b/frontend/src/data-objects/learning-paths/learning-path.ts
index d764d123..22ccdf0d 100644
--- a/frontend/src/data-objects/learning-paths/learning-path.ts
+++ b/frontend/src/data-objects/learning-paths/learning-path.ts
@@ -1,6 +1,6 @@
 import type { Language } from "@/data-objects/language.ts";
 import { LearningPathNode } from "@/data-objects/learning-paths/learning-path-node.ts";
-import type { LearningPathDTO } from "@/data-objects/learning-paths/learning-path-dto.ts";
+import type { LearningObjectNode, LearningPath as LearningPathDTO } from "@dwengo-1/common/interfaces/learning-content";
 
 export interface LearningPathNodeDTO {
     _id: string;
@@ -77,16 +77,19 @@ export class LearningPath {
             hruid: dto.hruid,
             title: dto.title,
             description: dto.description,
-            amountOfNodes: dto.num_nodes,
-            amountOfNodesLeft: dto.num_nodes_left,
+            amountOfNodes: dto.num_nodes ?? dto.nodes.length,
+            amountOfNodesLeft: dto.num_nodes_left ?? dto.nodes.length,
             keywords: dto.keywords.split(" "),
-            targetAges: { min: dto.min_age, max: dto.max_age },
+            targetAges: {
+                min: dto.min_age ?? NaN,
+                max: dto.max_age ?? NaN
+            },
             startNode: LearningPathNode.fromDTOAndOtherNodes(LearningPath.getStartNode(dto), dto.nodes),
             image: dto.image,
         });
     }
 
-    static getStartNode(dto: LearningPathDTO): LearningPathNodeDTO {
+    static getStartNode(dto: LearningPathDTO): LearningObjectNode {
         const startNodeDtos = dto.nodes.filter((it) => it.start_node === true);
         if (startNodeDtos.length < 1) {
             // The learning path has no starting node -> use the first node.
diff --git a/frontend/src/i18n/locale/en.json b/frontend/src/i18n/locale/en.json
index 47acd255..d014cf39 100644
--- a/frontend/src/i18n/locale/en.json
+++ b/frontend/src/i18n/locale/en.json
@@ -134,5 +134,9 @@
     "invalidZip": "This is not a valid zip file.",
     "emptyZip": "This zip file is empty",
     "missingMetadata": "This learning object is missing a metadata.json file.",
-    "missingContent": "This learning object is missing a content.* file."
+    "missingContent": "This learning object is missing a content.* file.",
+    "open": "open",
+    "editLearningPath": "Edit learning path",
+    "newLearningPath": "Create a new learning path",
+    "saveChanges": "Save changes"
 }
diff --git a/frontend/src/queries/learning-paths.ts b/frontend/src/queries/learning-paths.ts
index d24b6fc5..7f43b5a9 100644
--- a/frontend/src/queries/learning-paths.ts
+++ b/frontend/src/queries/learning-paths.ts
@@ -2,9 +2,9 @@ import { type MaybeRefOrGetter, toValue } from "vue";
 import type { Language } from "@/data-objects/language.ts";
 import { useMutation, useQuery, useQueryClient, type UseMutationReturnType, type UseQueryReturnType } from "@tanstack/vue-query";
 import { getLearningPathController } from "@/controllers/controllers";
-import type { LearningPath } from "@/data-objects/learning-paths/learning-path.ts";
 import type { AxiosError } from "axios";
-import type { LearningPathDTO } from "@/data-objects/learning-paths/learning-path-dto";
+import type { LearningPath as LearningPathDTO } from "@dwengo-1/common/interfaces/learning-content";
+import type { LearningPath } from "@/data-objects/learning-paths/learning-path";
 
 export const LEARNING_PATH_KEY = "learningPath";
 const learningPathController = getLearningPathController();
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index c8a1ebc4..274e8c5d 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -106,6 +106,12 @@ const router = createRouter({
             component: SingleDiscussion,
             meta: { requiresAuth: true },
         },
+        {
+            path: "/my-content",
+            name: "OwnLearningContentPage",
+            component: OwnLearningContentPage,
+            meta: { requiresAuth: true }
+        },
         {
             path: "/learningPath",
             children: [
@@ -115,18 +121,12 @@ const router = createRouter({
                     component: LearningPathSearchPage,
                     meta: { requiresAuth: true },
                 },
-                {
-                    path: "my",
-                    name: "OwnLearningContentPage",
-                    component: OwnLearningContentPage,
-                    meta: { requiresAuth: true }
-                },
                 {
                     path: ":hruid/:language/:learningObjectHruid",
                     name: "LearningPath",
                     component: LearningPathPage,
                     props: true,
-                    meta: { requiresAuth: true },
+                    meta: { requiresAuth: true }
                 },
             ],
         },
diff --git a/frontend/src/views/learning-paths/LearningPathPage.vue b/frontend/src/views/learning-paths/LearningPathPage.vue
index dc444156..c3cf64a9 100644
--- a/frontend/src/views/learning-paths/LearningPathPage.vue
+++ b/frontend/src/views/learning-paths/LearningPathPage.vue
@@ -247,7 +247,7 @@
                     </template>
                 </v-list-item>
                 <v-divider></v-divider>
-                <div v-if="props.learningObjectHruid">
+                <div>
                     <using-query-result
                         :query-result="learningObjectListQueryResult"
                         v-slot="learningObjects: { data: LearningObject[] }"
diff --git a/frontend/src/views/own-learning-content/OwnLearningContentPage.vue b/frontend/src/views/own-learning-content/OwnLearningContentPage.vue
index 02a2e90d..290cf768 100644
--- a/frontend/src/views/own-learning-content/OwnLearningContentPage.vue
+++ b/frontend/src/views/own-learning-content/OwnLearningContentPage.vue
@@ -6,9 +6,9 @@
     import UsingQueryResult from "@/components/UsingQueryResult.vue";
     import type { LearningObject } from "@/data-objects/learning-objects/learning-object";
     import { ref, type Ref } from "vue";
-import { useI18n } from "vue-i18n";
-import { useGetAllLearningPathsByAdminQuery } from "@/queries/learning-paths";
-import type { LearningPathDTO } from "@/data-objects/learning-paths/learning-path-dto";
+    import { useI18n } from "vue-i18n";
+    import { useGetAllLearningPathsByAdminQuery } from "@/queries/learning-paths";
+    import type { LearningPath as LearningPathDTO } from "@dwengo-1/common/interfaces/learning-content";
 
     const { t } = useI18n();
 
@@ -43,7 +43,7 @@ import type { LearningPathDTO } from "@/data-objects/learning-paths/learning-pat
                     :query-result="learningPathsQuery"
                     v-slot="response: { data: LearningPathDTO[] }"
                 >
-                    <own-learning-paths-view :learning-paths="response.data"/>
+                    <own-learning-paths-view :learningPaths="response.data"/>
                 </using-query-result>
             </v-tabs-window-item>
         </v-tabs-window>
diff --git a/frontend/src/views/own-learning-content/learning-objects/OwnLearningObjectsView.vue b/frontend/src/views/own-learning-content/learning-objects/OwnLearningObjectsView.vue
index e353cff7..5603e4fb 100644
--- a/frontend/src/views/own-learning-content/learning-objects/OwnLearningObjectsView.vue
+++ b/frontend/src/views/own-learning-content/learning-objects/OwnLearningObjectsView.vue
@@ -2,7 +2,7 @@
     import type { LearningObject } from '@/data-objects/learning-objects/learning-object';
     import LearningObjectUploadButton from '@/views/own-learning-content/learning-objects/LearningObjectUploadButton.vue'
     import LearningObjectPreviewCard from './LearningObjectPreviewCard.vue';
-    import { computed, ref, type Ref } from 'vue';
+    import { computed, ref, watch, type Ref } from 'vue';
     import { useI18n } from 'vue-i18n';
 
     const { t } = useI18n();
@@ -19,6 +19,8 @@
 
     const selectedLearningObjects: Ref<LearningObject[]> = ref([]);
 
+    watch(() => props.learningObjects, () => selectedLearningObjects.value = []);
+
     const selectedLearningObject = computed(() =>
         selectedLearningObjects.value ? selectedLearningObjects.value[0] : undefined
     );
@@ -27,16 +29,20 @@
 
 <template>
     <div class="root">
-        <v-data-table
-            class="table"
-            v-model="selectedLearningObjects"
-            :items="props.learningObjects"
-            :headers="tableHeaders"
-            select-strategy="single"
-            show-select
-            return-object
-        />
-        <learning-object-preview-card class="preview" :selectedLearningObject="selectedLearningObject"/>
+        <div class="table-container">
+            <v-data-table
+                class="table"
+                v-model="selectedLearningObjects"
+                :items="props.learningObjects"
+                :headers="tableHeaders"
+                select-strategy="single"
+                show-select
+                return-object
+            />
+        </div>
+        <div class="preview-container" v-if="selectedLearningObject">
+            <learning-object-preview-card class="preview" :selectedLearningObject="selectedLearningObject"/>
+        </div>
     </div>
     <div class="fab">
         <learning-object-upload-button/>
@@ -55,11 +61,17 @@
         padding: 20px;
         flex-wrap: wrap;
     }
-    .preview {
+    .preview-container {
         flex: 1;
         min-width: 400px;
     }
-    .table {
+    .table-container {
         flex: 1;
     }
+    .preview {
+        width: 100%;
+    }
+    .table {
+        width: 100%;
+    }
 </style>
diff --git a/frontend/src/views/own-learning-content/learning-paths/LearningPathPreviewCard.vue b/frontend/src/views/own-learning-content/learning-paths/LearningPathPreviewCard.vue
index 2013e048..1c7f09c1 100644
--- a/frontend/src/views/own-learning-content/learning-paths/LearningPathPreviewCard.vue
+++ b/frontend/src/views/own-learning-content/learning-paths/LearningPathPreviewCard.vue
@@ -1,48 +1,80 @@
 <script setup lang="ts">
-    import UsingQueryResult from '@/components/UsingQueryResult.vue';
     import { useI18n } from 'vue-i18n';
-    import type { LearningPathDTO } from '@/data-objects/learning-paths/learning-path-dto';
-    import { computed, ref, watch } from 'vue';
+    import { computed, ref, watch, type Ref } from 'vue';
     import JsonEditorVue from 'json-editor-vue'
-import { useMutation } from '@tanstack/vue-query';
-import { usePostLearningPathMutation, usePutLearningPathMutation } from '@/queries/learning-paths';
+    import { useDeleteLearningPathMutation, usePostLearningPathMutation, usePutLearningPathMutation } from '@/queries/learning-paths';
+    import { Language } from '@/data-objects/language';
+    import type { LearningPath } from '@dwengo-1/common/interfaces/learning-content';
+    import type { AxiosError } from 'axios';
 
     const { t } = useI18n();
 
     const props = defineProps<{
-        selectedLearningPath?: LearningPathDTO
+        selectedLearningPath?: LearningPath
     }>();
 
-    const INDENT = 4;
-    const DEFAULT_LEARNING_PATH: LearningPathDTO = {
-        language: '',
-        hruid: '',
-        title: '',
-        description: '',
-        num_nodes: 0,
-        num_nodes_left: 0,
-        nodes: [],
-        keywords: '',
-        target_ages: [],
-        min_age: 0,
-        max_age: 0,
-        __order: 0
+    const { isPending, mutate, error: deleteError, isSuccess: deleteSuccess } = useDeleteLearningPathMutation();
+
+    const DEFAULT_LEARNING_PATH: LearningPath = {
+        language: 'en',
+        hruid: '...',
+        title: '...',
+        description: '...',
+        nodes: [
+            {
+                learningobject_hruid: '...',
+                language: Language.English,
+                version: 1,
+                start_node: true,
+                transitions: [
+                    {
+                        default: true,
+                        condition: "(remove if the transition should be unconditinal)",
+                        next: {
+                            hruid: '...',
+                            version: 1,
+                            language: '...'
+                        }
+                    }
+                ]
+            }
+        ],
+        keywords: 'Keywords separated by spaces',
+        target_ages: []
     }
 
-    const { isPending: isPostPending, mutate: doPost } = usePostLearningPathMutation();
-    const { isPending: isPutPending, mutate: doPut } = usePutLearningPathMutation();
+    const { isPending: isPostPending, error: postError, mutate: doPost } = usePostLearningPathMutation();
+    const { isPending: isPutPending, error: putError, mutate: doPut } = usePutLearningPathMutation();
 
-    const learningPath = ref(DEFAULT_LEARNING_PATH);
+    const learningPath: Ref<LearningPath | string> = ref(DEFAULT_LEARNING_PATH);
+
+    const parsedLearningPath = computed(() =>
+        typeof learningPath.value === "string" ? JSON.parse(learningPath.value) as LearningPath
+                                               : learningPath.value
+    );
 
     watch(() => props.selectedLearningPath, () => learningPath.value = props.selectedLearningPath ?? DEFAULT_LEARNING_PATH);
 
     function uploadLearningPath(): void {
         if (props.selectedLearningPath) {
-            doPut({ learningPath: learningPath.value });
+            doPut({ learningPath: parsedLearningPath.value });
         } else {
-            doPost({ learningPath: learningPath.value });
+            doPost({ learningPath: parsedLearningPath.value });
         }
     }
+
+    function deleteLearningObject(): void {
+        if (props.selectedLearningPath) {
+            mutate({
+                hruid: props.selectedLearningPath.hruid,
+                language: props.selectedLearningPath.language as Language
+            });
+        }
+    }
+
+    function extractErrorMessage(error: AxiosError | null): string | undefined {
+        return (error?.response?.data as {error: string}).error ?? error?.message;
+    }
 </script>
 
 <template>
@@ -51,9 +83,27 @@ import { usePostLearningPathMutation, usePutLearningPathMutation } from '@/queri
     >
         <template v-slot:text>
             <json-editor-vue v-model="learningPath"></json-editor-vue>
+            <v-alert
+                 v-if="postError || putError || deleteError"
+                 icon="mdi mdi-alert-circle"
+                 type="error"
+                 :title="t('error')"
+                 :text="t(extractErrorMessage(postError) || extractErrorMessage(putError) || extractErrorMessage(deleteError)!)"
+            ></v-alert>
         </template>
         <template v-slot:actions>
-            <v-btn @click="uploadLearningPath" :loading="isPostPending || isPutPending">{{ props.selectedLearningPath ? t('saveChanges') : t('create') }}</v-btn>
+            <v-btn @click="uploadLearningPath" :loading="isPostPending || isPutPending" :disabled="parsedLearningPath.hruid === DEFAULT_LEARNING_PATH.hruid">
+                {{ props.selectedLearningPath ? t('saveChanges') : t('create') }}
+            </v-btn>
+            <v-btn @click="deleteLearningObject" :disabled="!props.selectedLearningPath">
+                {{ t('delete') }}
+            </v-btn>
+            <v-btn
+                :href="`/learningPath/${props.selectedLearningPath?.hruid}/${props.selectedLearningPath?.language}/start`"
+                :disabled="!props.selectedLearningPath"
+            >
+                {{ t('open') }}
+            </v-btn>
         </template>
     </v-card>
 </template>
diff --git a/frontend/src/views/own-learning-content/learning-paths/OwnLearningPathsView.vue b/frontend/src/views/own-learning-content/learning-paths/OwnLearningPathsView.vue
index 5464126c..85aeae63 100644
--- a/frontend/src/views/own-learning-content/learning-paths/OwnLearningPathsView.vue
+++ b/frontend/src/views/own-learning-content/learning-paths/OwnLearningPathsView.vue
@@ -1,8 +1,8 @@
 <script setup lang="ts">
     import LearningPathPreviewCard from './LearningPathPreviewCard.vue';
-    import { computed, ref, type Ref } from 'vue';
+    import { computed, ref, watch, type Ref } from 'vue';
     import { useI18n } from 'vue-i18n';
-    import type { LearningPathDTO } from '@/data-objects/learning-paths/learning-path-dto';
+    import type { LearningPath as LearningPathDTO } from '@dwengo-1/common/interfaces/learning-content';
 
     const { t } = useI18n();
     const props = defineProps<{
@@ -10,7 +10,7 @@
     }>();
 
     const tableHeaders = [
-        { title: t("hruid"), width: "250px", key: "key" },
+        { title: t("hruid"), width: "250px", key: "hruid" },
         { title: t("language"), width: "50px", key: "language" },
         { title: t("title"), key: "title" }
     ];
@@ -21,20 +21,25 @@
         selectedLearningPaths.value ? selectedLearningPaths.value[0] : undefined
     );
 
+    watch(() => props.learningPaths, () => selectedLearningPaths.value = []);
 </script>
 
 <template>
     <div class="root">
-        <v-data-table
-            class="table"
-            v-model="selectedLearningPaths"
-            :items="props.learningPaths"
-            :headers="tableHeaders"
-            select-strategy="single"
-            show-select
-            return-object
-        />
-        <learning-path-preview-card class="preview" :selectedLearningPath="selectedLearningPath"/>
+        <div class="table-container">
+            <v-data-table
+                class="table"
+                v-model="selectedLearningPaths"
+                :items="props.learningPaths"
+                :headers="tableHeaders"
+                select-strategy="single"
+                show-select
+                return-object
+            />
+        </div>
+        <div class="preview-container">
+            <learning-path-preview-card class="preview" :selectedLearningPath="selectedLearningPath"/>
+        </div>
     </div>
 </template>
 
@@ -50,11 +55,17 @@
         padding: 20px;
         flex-wrap: wrap;
     }
-    .preview {
+    .preview-container {
         flex: 1;
         min-width: 400px;
     }
-    .table {
+    .table-container {
         flex: 1;
     }
+    .preview {
+        width: 100%;
+    }
+    .table {
+        width: 100%;
+    }
 </style>