diff --git a/api/main.py b/api/main.py
index 73b4be3..9ff3f01 100644
--- a/api/main.py
+++ b/api/main.py
@@ -544,6 +544,28 @@ async def get_records(
     }
 
 
+class SetCoverUrlBody(BaseModel):
+    cover_url: str
+
+
+@app.patch("/api/records/{record_id}/cover_url")
+async def set_record_cover_url(record_id: int, body: SetCoverUrlBody):
+    if pool is None:
+        raise HTTPException(503, detail="Datenbank nicht verbunden")
+    url = body.cover_url.strip()
+    if not url:
+        raise HTTPException(422, detail="cover_url darf nicht leer sein")
+    async with pool.acquire() as conn:
+        row = await conn.fetchrow(
+            f"UPDATE {qualified_table} SET cover_url = $1, cover_image = NULL, cover_mime_type = NULL WHERE id = $2 RETURNING id, cover_url",
+            url,
+            record_id,
+        )
+    if row is None:
+        raise HTTPException(404, detail=f"Eintrag mit ID {record_id} nicht gefunden")
+    return {"id": row["id"], "cover_url": row["cover_url"]}
+
+
 @app.patch("/api/records/{record_id}/seen")
 async def set_record_seen(record_id: int, body: SetSeenBody):
     """Einzelnen Eintrag als gesehen (seen=true) oder ungesehen (seen=false) markieren."""
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 82aae04..e1665b0 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -7,12 +7,14 @@ import {
   fetchRecords,
   markAllSeen,
   setRecordSeen,
+  updateCoverUrl,
 } from './api'
 import type { FilterOptions, MediaRecord } from './types'
 import { isUnseen } from './utils/seen'
 import { useAutoRefresh } from './composables/useAutoRefresh'
 import { captureScroll, restoreScroll } from './utils/preserveScroll'
 import FilterBar from './components/FilterBar.vue'
+import CoverUrlModal from './components/CoverUrlModal.vue'
 import { boundToIso, emptyDateTimeBound, type DateTimeBound } from './utils/datetime'
 import DataTable from './components/DataTable.vue'
 import MobileCards from './components/MobileCards.vue'
@@ -39,6 +41,7 @@ let debounceTimer: ReturnType<typeof setTimeout> | null = null
 const isMobile = ref(false)
 const deletingId = ref<number | null>(null)
 const togglingSeenId = ref<number | null>(null)
+const coverEditRecord = ref<MediaRecord | null>(null)
 
 const autoRefreshEnabled = ref(true)
 const autoRefreshPaused = computed(
@@ -170,6 +173,21 @@ async function handleMarkAllSeen() {
   }
 }
 
+async function handleCoverSave(recordId: number, url: string) {
+  error.value = null
+  try {
+    const result = await updateCoverUrl(recordId, url)
+    const record = records.value.find((r) => r.id === recordId)
+    if (record) {
+      record.cover_url = result.cover_url
+      record.cover_mime_type = null
+    }
+    coverEditRecord.value = null
+  } catch (e) {
+    error.value = e instanceof Error ? e.message : 'Cover-URL konnte nicht gespeichert werden'
+  }
+}
+
 async function handleDelete(id: number) {
   const row = records.value.find((r) => r.id === id)
   const label = row?.file_name_new || row?.file_name_original || `ID ${id}`
@@ -285,6 +303,7 @@ onBeforeUnmount(() => {
             :toggling-seen-id="togglingSeenId"
             @delete="handleDelete"
             @toggle-seen="handleToggleSeen"
+            @edit-cover="(r) => (coverEditRecord = r)"
           />
         </div>
         <div v-show="isMobile" class="view-mobile">
@@ -294,11 +313,19 @@ onBeforeUnmount(() => {
             :toggling-seen-id="togglingSeenId"
             @delete="handleDelete"
             @toggle-seen="handleToggleSeen"
+            @edit-cover="(r) => (coverEditRecord = r)"
           />
         </div>
       </template>
     </main>
   </div>
+
+  <CoverUrlModal
+    :open="coverEditRecord !== null"
+    :record-id="coverEditRecord?.id ?? 0"
+    @close="coverEditRecord = null"
+    @save="handleCoverSave"
+  />
 </template>
 
 <style scoped>
diff --git a/frontend/src/api.ts b/frontend/src/api.ts
index 6478fdf..970b8f2 100644
--- a/frontend/src/api.ts
+++ b/frontend/src/api.ts
@@ -79,6 +79,20 @@ export async function markAllSeen(params: FetchParams = {}): Promise<{ marked: n
   return res.json()
 }
 
+export async function updateCoverUrl(
+  id: number,
+  coverUrl: string,
+): Promise<{ id: number; cover_url: string }> {
+  const res = await fetch(`/api/records/${id}/cover_url`, {
+    ...fetchOpts,
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ cover_url: coverUrl }),
+  })
+  if (!res.ok) throw new Error(await parseApiError(res))
+  return res.json() as Promise<{ id: number; cover_url: string }>
+}
+
 export async function deleteRecord(id: number): Promise<void> {
   const res = await fetch(`/api/records/${id}`, { ...fetchOpts, method: 'DELETE' })
   if (!res.ok) throw new Error(await parseApiError(res))
diff --git a/frontend/src/components/CoverUrlModal.vue b/frontend/src/components/CoverUrlModal.vue
new file mode 100644
index 0000000..a429f82
--- /dev/null
+++ b/frontend/src/components/CoverUrlModal.vue
@@ -0,0 +1,145 @@
+<script setup lang="ts">
+import { ref, watch } from 'vue'
+
+const props = defineProps<{ recordId: number; open: boolean }>()
+const emit = defineEmits<{
+  close: []
+  save: [recordId: number, url: string]
+}>()
+
+const url = ref('')
+const error = ref('')
+
+watch(
+  () => props.open,
+  (v) => {
+    if (v) { url.value = ''; error.value = '' }
+  },
+)
+
+function onSave() {
+  const trimmed = url.value.trim()
+  if (!trimmed.startsWith('http://') && !trimmed.startsWith('https://')) {
+    error.value = 'Bitte eine gültige URL eingeben (http:// oder https://)'
+    return
+  }
+  emit('save', props.recordId, trimmed)
+}
+
+function onBackdrop(e: MouseEvent) {
+  if (e.target === e.currentTarget) emit('close')
+}
+</script>
+
+<template>
+  <Teleport to="body">
+    <div v-if="open" class="modal-backdrop" @click="onBackdrop">
+      <div class="modal" role="dialog" aria-modal="true">
+        <h2 class="modal__title">Cover-URL festlegen</h2>
+        <p class="modal__hint">URL des Cover-Bildes eingeben. Das Bild wird sofort als Vorschau geladen und von n8n in die Datenbank übernommen.</p>
+        <input
+          v-model="url"
+          class="modal__input"
+          type="url"
+          placeholder="https://..."
+          autofocus
+          @keydown.enter="onSave"
+          @keydown.esc="emit('close')"
+        />
+        <p v-if="error" class="modal__error">{{ error }}</p>
+        <div class="modal__actions">
+          <button class="btn btn--ghost" @click="emit('close')">Abbrechen</button>
+          <button class="btn btn--primary" @click="onSave">Speichern</button>
+        </div>
+      </div>
+    </div>
+  </Teleport>
+</template>
+
+<style scoped>
+.modal-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.55);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+
+.modal {
+  background: var(--bg-elevated);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  padding: 1.5rem;
+  width: min(480px, 90vw);
+  display: flex;
+  flex-direction: column;
+  gap: 0.85rem;
+}
+
+.modal__title {
+  margin: 0;
+  font-size: 1.05rem;
+  font-weight: 700;
+}
+
+.modal__hint {
+  margin: 0;
+  font-size: 0.85rem;
+  color: var(--text-muted);
+}
+
+.modal__input {
+  width: 100%;
+  box-sizing: border-box;
+  padding: 0.5rem 0.75rem;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--bg);
+  color: var(--text);
+  font-size: 0.9rem;
+  font-family: var(--mono);
+}
+
+.modal__input:focus {
+  outline: 2px solid var(--accent);
+  outline-offset: 1px;
+}
+
+.modal__error {
+  margin: 0;
+  font-size: 0.82rem;
+  color: var(--danger, #e05);
+}
+
+.modal__actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.5rem;
+}
+
+.btn {
+  padding: 0.45rem 1rem;
+  border-radius: var(--radius);
+  font-size: 0.875rem;
+  font-weight: 600;
+  cursor: pointer;
+  border: 1px solid transparent;
+}
+
+.btn--ghost {
+  background: none;
+  border-color: var(--border);
+  color: var(--text-muted);
+}
+
+.btn--primary {
+  background: var(--accent);
+  color: #fff;
+}
+
+.btn--primary:hover {
+  background: var(--accent-hover);
+}
+</style>
diff --git a/frontend/src/components/DataTable.vue b/frontend/src/components/DataTable.vue
index 8751e61..d8703d4 100644
--- a/frontend/src/components/DataTable.vue
+++ b/frontend/src/components/DataTable.vue
@@ -26,8 +26,13 @@ const props = defineProps<{
 const emit = defineEmits<{
   delete: [id: number]
   'toggle-seen': [record: MediaRecord]
+  'edit-cover': [record: MediaRecord]
 }>()
 
+function needsCover(record: MediaRecord): boolean {
+  return !record.cover_mime_type && (!record.cover_url || record.cover_url === 'N/A')
+}
+
 function onRowClick(record: MediaRecord, event: MouseEvent) {
   const target = event.target as HTMLElement
   if (target.closest('button, a, input, select')) return
@@ -47,12 +52,21 @@ const columns: ColumnDef<MediaRecord>[] = [
     accessorKey: 'cover_url',
     enableSorting: false,
     cell: ({ row }) =>
-      h(CoverImage, {
-        url: row.original.cover_url,
-        id: row.original.id,
-        hasCoverInDb: Boolean(row.original.cover_mime_type),
-        size: 'table',
-      }),
+      h('div', { class: 'cover-cell' }, [
+        h(CoverImage, {
+          url: row.original.cover_url,
+          id: row.original.id,
+          hasCoverInDb: Boolean(row.original.cover_mime_type),
+          size: 'table',
+        }),
+        needsCover(row.original)
+          ? h('button', {
+              class: 'cover-edit-btn',
+              title: 'Cover-URL eingeben',
+              onClick: (e: Event) => { e.stopPropagation(); emit('edit-cover', row.original) },
+            }, '＋')
+          : null,
+      ]),
   },
   {
     id: 'object_type',
@@ -364,6 +378,33 @@ td {
   padding-right: 0.35rem;
 }
 
+.cover-cell {
+  position: relative;
+  display: inline-block;
+}
+
+.cover-edit-btn {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.45);
+  border: 2px dashed var(--border);
+  border-radius: var(--radius);
+  color: var(--text-muted);
+  font-size: 1.4rem;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  opacity: 0;
+  transition: opacity 0.15s;
+}
+
+.cover-cell:hover .cover-edit-btn {
+  opacity: 1;
+}
+
 .th-type,
 .td-type {
   width: 88px;
diff --git a/frontend/src/components/MobileCards.vue b/frontend/src/components/MobileCards.vue
index 6eb15c5..0f6aaf5 100644
--- a/frontend/src/components/MobileCards.vue
+++ b/frontend/src/components/MobileCards.vue
@@ -17,8 +17,13 @@ const props = defineProps<{
 const emit = defineEmits<{
   delete: [id: number]
   'toggle-seen': [record: MediaRecord]
+  'edit-cover': [record: MediaRecord]
 }>()
 
+function needsCover(record: MediaRecord): boolean {
+  return !record.cover_mime_type && (!record.cover_url || record.cover_url === 'N/A')
+}
+
 function onCardClick(record: MediaRecord, event: MouseEvent) {
   const target = event.target as HTMLElement
   if (target.closest('button, a, input, select, dl')) return
@@ -74,7 +79,15 @@ const detailFields: { key: keyof MediaRecord; label: string }[] = [
       @click="onCardClick(row, $event)"
     >
       <div class="card__hero">
-        <CoverImage :url="row.cover_url" :id="row.id" :has-cover-in-db="Boolean(row.cover_mime_type)" size="card" />
+        <div class="cover-wrap">
+          <CoverImage :url="row.cover_url" :id="row.id" :has-cover-in-db="Boolean(row.cover_mime_type)" size="card" />
+          <button
+            v-if="needsCover(row)"
+            class="cover-edit-btn"
+            title="Cover-URL eingeben"
+            @click.stop="emit('edit-cover', row)"
+          >＋</button>
+        </div>
         <div class="card__hero-text">
       <header class="card__header">
         <div class="card__meta">
@@ -153,6 +166,27 @@ const detailFields: { key: keyof MediaRecord; label: string }[] = [
   align-items: flex-start;
 }
 
+.cover-wrap {
+  position: relative;
+  flex-shrink: 0;
+}
+
+.cover-edit-btn {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.45);
+  border: 2px dashed var(--border);
+  border-radius: var(--radius);
+  color: var(--text-muted);
+  font-size: 1.4rem;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
 .card__hero-text {
   flex: 1;
   min-width: 0;
diff --git a/scripts/deploy.sh b/scripts/deploy.sh
index 055de14..cc629af 100644
--- a/scripts/deploy.sh
+++ b/scripts/deploy.sh
@@ -18,10 +18,13 @@ scp_remote() {
 echo "Übertrage Dateien …"
 scp_remote "api/main.py"                                          "api/main.py"
 scp_remote "frontend/src/types.ts"                                "frontend/src/types.ts"
+scp_remote "frontend/src/api.ts"                                  "frontend/src/api.ts"
 scp_remote "frontend/src/utils/coverUrl.ts"                       "frontend/src/utils/coverUrl.ts"
 scp_remote "frontend/src/components/CoverImage.vue"               "frontend/src/components/CoverImage.vue"
 scp_remote "frontend/src/components/DataTable.vue"                "frontend/src/components/DataTable.vue"
 scp_remote "frontend/src/components/MobileCards.vue"              "frontend/src/components/MobileCards.vue"
+scp_remote "frontend/src/components/CoverUrlModal.vue"            "frontend/src/components/CoverUrlModal.vue"
+scp_remote "frontend/src/App.vue"                                 "frontend/src/App.vue"
 
 echo "Baue Docker-Container neu …"
 ssh -o ControlPath="$SOCKET" "$HOST" "cd $REMOTE && docker compose up -d --build"