fix(import): stop several entries from claiming one request

static/app.js

@@ -621,6 +621,7 @@ $("#detail-form").addEventListener("submit", async (e) => {
 // ---- import ----
 let scanItems = [];
 let missingReqs = [];
+let importedReqs = [];
 let viewIdx = []; // indices into scanItems after filter/sort
 let importPage = 0;
 const IMPORT_PAGE_SIZE = 25;
@@ -631,9 +632,10 @@ $("#scan-btn").addEventListener("click", async () => {
   $("#scan-info").innerHTML = '<span class="spinner"></span> Scanne…';
   try {
     const split = $("#split-dirs").checked;
-    const [scan, reqs] = await Promise.all([
+    const [scan, reqs, done] = await Promise.all([
       api("/api/import/scan?split_dirs=" + split),
       api("/api/requests?status=missing"),
+      api("/api/requests?status=imported"),
     ]);
     scanItems = scan.items;
     // selection state lives here, not in the DOM, so it survives paging/filtering
@@ -642,6 +644,7 @@ $("#scan-btn").addEventListener("click", async () => {
       item.checked = !!item.suggested_request_id;
     });
     missingReqs = reqs;
+    importedReqs = done;
     importPage = 0;
     $("#scan-info").textContent = `${scan.items.length} Kandidat(en) in ${scan.download_dir}`;
     $("#import-toolbar").hidden = scanItems.length === 0;
@@ -699,13 +702,18 @@ function renderImportTable() {
   tbody.innerHTML = pageIdx
     .map((i) => {
       const item = scanItems[i];
+      const option = (r, suffix = "") =>
+        `<option value="${r.id}" ${r.id === item.request_id ? "selected" : ""}>
+          ${esc(r.title)} — ${esc(r.authors)} (${esc(r.library_name)})${suffix}</option>`;
       const opts = missingReqs
         .filter((r) => r.media_type === item.media_type)
-        .map(
-          (r) =>
-            `<option value="${r.id}" ${r.id === item.request_id ? "selected" : ""}>
-              ${esc(r.title)} — ${esc(r.authors)} (${esc(r.library_name)})</option>`
-        )
+        .map((r) => option(r))
+        .join("");
+      // already imported audiobooks can take further parts (a late CD, or one
+      // that failed while its siblings went through)
+      const appendOpts = importedReqs
+        .filter((r) => r.media_type === item.media_type && r.imported_path)
+        .map((r) => option(r, " ↩︎"))
         .join("");
       return `<tr>
         <td><input type="checkbox" data-check="${i}" ${item.checked ? "checked" : ""}></td>
@@ -716,7 +724,9 @@ function renderImportTable() {
         </td>
         <td>${esc(item.media_type)}</td>
         <td class="row">
-          <select data-select="${i}"><option value="">— überspringen —</option>${opts}</select>
+          <select data-select="${i}"><option value="">— überspringen —</option>${opts}
+            ${appendOpts ? `<optgroup label="Bereits importiert — Teile anhängen">${appendOpts}</optgroup>` : ""}
+          </select>
           <button class="secondary" data-quick="${i}" title="Metadaten suchen und Anfrage direkt verbinden">🔍</button>
           ${item.parts ? `<button class="secondary" data-split="${i}" title="Zusammenfassung wieder auflösen">✂️</button>` : ""}
         </td>
@@ -1002,14 +1012,50 @@ async function pickQuickResult(r) {
 // ---- import execution (batched, with progress) ----
 const IMPORT_BATCH_SIZE = 20;
 
+// several entries on one request means one audiobook split across folders:
+// importing them one by one only imports the first and fails the rest
+function collapseSharedRequests(chosen) {
+  const byRequest = new Map();
+  for (const item of chosen) {
+    const group = byRequest.get(item.request_id);
+    if (group) group.push(item);
+    else byRequest.set(item.request_id, [item]);
+  }
+  const shared = [...byRequest.values()].filter((g) => g.length > 1);
+  if (shared.length) {
+    const names = shared
+      .map((g) => `• ${g.map((it) => it.name).join(" + ")}`)
+      .join("\n");
+    const ok = confirm(
+      `${shared.length} Anfrage(n) sind mehreren Einträgen zugeordnet:\n\n${names}\n\n` +
+        "Als je ein Hörbuch mit durchlaufenden Parts importieren?\n" +
+        "(Abbrechen: nichts wird importiert)"
+    );
+    if (!ok) return null;
+  }
+  return [...byRequest.values()].map((group) => ({
+    path: group.length > 1 ? sharedParent(group) : group[0].path,
+    is_dir: group.length > 1 ? true : group[0].is_dir,
+    files: group.flatMap((it) => it.files),
+    request_id: group[0].request_id,
+    append: importedReqs.some((r) => r.id === group[0].request_id),
+  }));
+}
+
+// deepest folder that holds all of the group's entries
+function sharedParent(group) {
+  const parts = group.map((it) => it.path.split("/"));
+  const first = parts[0];
+  let i = 0;
+  while (i < first.length - 1 && parts.every((p) => p[i] === first[i])) i++;
+  return first.slice(0, i).join("/") || group[0].path;
+}
+
 $("#import-btn").addEventListener("click", async () => {
-  const items = scanItems
-    .filter((item) => item.checked && item.request_id)
-    .map((item) => ({
-      path: item.path, is_dir: item.is_dir, files: item.files,
-      request_id: item.request_id,
-    }));
-  if (!items.length) { toast("Nichts ausgewählt", true); return; }
+  const chosen = scanItems.filter((item) => item.checked && item.request_id);
+  if (!chosen.length) { toast("Nichts ausgewählt", true); return; }
+  const items = collapseSharedRequests(chosen);
+  if (!items) return;
   const btn = $("#import-btn");
   btn.disabled = true;
   const allResults = [];