Merge feature/v1.7: CSV-Import/-Export, RSS-Fix für mehrere Essenszeiten

CSV-Import/-Export (Gerichte, Allergene, Zusatzstoffe): neue Export-/
Import-Routen unter app/api/*/export und */import, hand-geschriebener
CSV-Parser/-Serializer (lib/csv.ts, keine neue Abhängigkeit), Upsert
über Kürzel (Allergene/Zusatzstoffe) bzw. exakten Namen (Gerichte,
mit Ambiguitäts-Check bei Namensdopplung). UI-Buttons in DishManager
und CodeListManager.

RSS-Feed: <content:encoded> zusätzlich zu <description> ausgeben,
da mehrere Feed-Reader description als kürzbare Vorschau behandeln
und dadurch bei mehreren Essenszeiten pro Tag nur die erste zeigten.

Version 1.7.0.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -4,6 +4,35 @@ Alle nennenswerten Änderungen an diesem Projekt werden hier dokumentiert.
 Format angelehnt an [Keep a Changelog](https://keepachangelog.com/de/1.1.0/),
 Versionierung nach [Semantic Versioning](https://semver.org/lang/de/).
 
+## [1.7.0] – 2026-07-19
+
+### Hinzugefügt
+- CSV-Import/-Export für Gerichte, Allergene und Zusatzstoffe (Buttons
+  „Exportieren“/„Importieren“ auf den jeweiligen Verwaltungsseiten).
+  Export lädt die aktuelle Liste als CSV herunter (Gerichte:
+  `name,name_en,name_pl,price,allergens,additives`, Allergene/
+  Zusatzstoffe: `code,name,name_en,name_pl`; Kürzel bei Gerichten
+  Semikolon-getrennt in einer Zelle, z. B. `A;G`). Import liest dieselbe
+  Spaltenstruktur (Reihenfolge egal, Groß-/Kleinschreibung der
+  Kopfzeile wird ignoriert) und aktualisiert bestehende Einträge
+  (Abgleich über Kürzel bei Allergenen/Zusatzstoffen, über den exakten
+  Namen bei Gerichten) bzw. legt neue an. Zeilen mit fehlenden
+  Pflichtfeldern, ungültigem Preis oder mehrdeutigem Gerichtsnamen
+  (mehrere Gerichte mit demselben Namen) werden übersprungen und mit
+  Grund in der Erfolgsmeldung aufgelistet, statt den ganzen Import
+  abzubrechen.
+
+### Behoben
+- RSS-Feed (`/feed.xml`): Mehrere Feed-Reader (u. a. Outlook,
+  Thunderbird) behandeln `<description>` als kurze Vorschau und kürzen
+  sie eigenmächtig – dadurch war bei Tagen mit mehreren Essenszeiten
+  oft nur die erste sichtbar, obwohl der Server bereits alle
+  Essenszeiten des Tages in der Beschreibung lieferte. Zusätzlich zu
+  `<description>` wird jetzt auch `<content:encoded>` (RSS-Content-
+  Modul) mit demselben vollständigen Inhalt ausgeliefert – von den
+  meisten Readern als vollständiger Artikeltext erkannt und ungekürzt
+  angezeigt.
+
 ## [1.6.3] – 2026-07-18
 
 ### Behoben

app/api/additives/export/route.ts

@@ -0,0 +1,24 @@
+import { listCodes } from "@/lib/db/code-lists";
+import { authErrorResponse, requireRole } from "@/lib/auth/session";
+import { toCsv } from "@/lib/csv";
+
+export async function GET() {
+  try {
+    await requireRole(["staff", "admin"]);
+    const items = await listCodes("additives");
+    const rows = [
+      ["code", "name", "name_en", "name_pl"],
+      ...items.map((i) => [i.code, i.name, i.name_en ?? "", i.name_pl ?? ""]),
+    ];
+    return new Response(toCsv(rows), {
+      headers: {
+        "Content-Type": "text/csv; charset=utf-8",
+        "Content-Disposition": 'attachment; filename="zusatzstoffe.csv"',
+      },
+    });
+  } catch (err) {
+    const res = authErrorResponse(err);
+    if (res) return res;
+    throw err;
+  }
+}

app/api/additives/import/route.ts

@@ -0,0 +1,53 @@
+import { NextResponse } from "next/server";
+import { importCodes, type CodeImportRow } from "@/lib/db/code-lists";
+import { authErrorResponse, requireRole } from "@/lib/auth/session";
+import { isSameOrigin } from "@/lib/origin";
+import { parseCsvWithHeader } from "@/lib/csv";
+
+export async function POST(request: Request) {
+  if (!isSameOrigin(request)) {
+    return NextResponse.json({ error: "Nicht erlaubt." }, { status: 403 });
+  }
+  try {
+    await requireRole(["staff", "admin"]);
+    const form = await request.formData();
+    const file = form.get("file");
+    if (!(file instanceof File)) {
+      return NextResponse.json({ error: "invalid_input" }, { status: 400 });
+    }
+
+    const { header, rows: cells } = parseCsvWithHeader(await file.text());
+    const codeIdx = header.indexOf("code");
+    const nameIdx = header.indexOf("name");
+    if (codeIdx === -1 || nameIdx === -1) {
+      return NextResponse.json({ error: "missing_columns" }, { status: 400 });
+    }
+    const nameEnIdx = header.indexOf("name_en");
+    const namePlIdx = header.indexOf("name_pl");
+
+    const rows: CodeImportRow[] = [];
+    const skipped: { row: number; reason: string }[] = [];
+    cells.forEach((c, i) => {
+      const rowNum = i + 2; // 1-indexiert + Kopfzeile
+      const code = (c[codeIdx] ?? "").trim();
+      const name = (c[nameIdx] ?? "").trim();
+      if (!code || !name) {
+        skipped.push({ row: rowNum, reason: "Kürzel oder Bezeichnung fehlt" });
+        return;
+      }
+      rows.push({
+        code,
+        name,
+        name_en: nameEnIdx >= 0 ? c[nameEnIdx]?.trim() || null : null,
+        name_pl: namePlIdx >= 0 ? c[namePlIdx]?.trim() || null : null,
+      });
+    });
+
+    const result = rows.length > 0 ? await importCodes("additives", rows) : { created: 0, updated: 0 };
+    return NextResponse.json({ ...result, skipped });
+  } catch (err) {
+    const res = authErrorResponse(err);
+    if (res) return res;
+    throw err;
+  }
+}

app/api/allergens/export/route.ts

@@ -0,0 +1,24 @@
+import { listCodes } from "@/lib/db/code-lists";
+import { authErrorResponse, requireRole } from "@/lib/auth/session";
+import { toCsv } from "@/lib/csv";
+
+export async function GET() {
+  try {
+    await requireRole(["staff", "admin"]);
+    const items = await listCodes("allergens");
+    const rows = [
+      ["code", "name", "name_en", "name_pl"],
+      ...items.map((i) => [i.code, i.name, i.name_en ?? "", i.name_pl ?? ""]),
+    ];
+    return new Response(toCsv(rows), {
+      headers: {
+        "Content-Type": "text/csv; charset=utf-8",
+        "Content-Disposition": 'attachment; filename="allergene.csv"',
+      },
+    });
+  } catch (err) {
+    const res = authErrorResponse(err);
+    if (res) return res;
+    throw err;
+  }
+}

app/api/allergens/import/route.ts

@@ -0,0 +1,53 @@
+import { NextResponse } from "next/server";
+import { importCodes, type CodeImportRow } from "@/lib/db/code-lists";
+import { authErrorResponse, requireRole } from "@/lib/auth/session";
+import { isSameOrigin } from "@/lib/origin";
+import { parseCsvWithHeader } from "@/lib/csv";
+
+export async function POST(request: Request) {
+  if (!isSameOrigin(request)) {
+    return NextResponse.json({ error: "Nicht erlaubt." }, { status: 403 });
+  }
+  try {
+    await requireRole(["staff", "admin"]);
+    const form = await request.formData();
+    const file = form.get("file");
+    if (!(file instanceof File)) {
+      return NextResponse.json({ error: "invalid_input" }, { status: 400 });
+    }
+
+    const { header, rows: cells } = parseCsvWithHeader(await file.text());
+    const codeIdx = header.indexOf("code");
+    const nameIdx = header.indexOf("name");
+    if (codeIdx === -1 || nameIdx === -1) {
+      return NextResponse.json({ error: "missing_columns" }, { status: 400 });
+    }
+    const nameEnIdx = header.indexOf("name_en");
+    const namePlIdx = header.indexOf("name_pl");
+
+    const rows: CodeImportRow[] = [];
+    const skipped: { row: number; reason: string }[] = [];
+    cells.forEach((c, i) => {
+      const rowNum = i + 2; // 1-indexiert + Kopfzeile
+      const code = (c[codeIdx] ?? "").trim();
+      const name = (c[nameIdx] ?? "").trim();
+      if (!code || !name) {
+        skipped.push({ row: rowNum, reason: "Kürzel oder Bezeichnung fehlt" });
+        return;
+      }
+      rows.push({
+        code,
+        name,
+        name_en: nameEnIdx >= 0 ? c[nameEnIdx]?.trim() || null : null,
+        name_pl: namePlIdx >= 0 ? c[namePlIdx]?.trim() || null : null,
+      });
+    });
+
+    const result = rows.length > 0 ? await importCodes("allergens", rows) : { created: 0, updated: 0 };
+    return NextResponse.json({ ...result, skipped });
+  } catch (err) {
+    const res = authErrorResponse(err);
+    if (res) return res;
+    throw err;
+  }
+}

app/api/dishes/export/route.ts

@@ -0,0 +1,32 @@
+import { query } from "@/lib/db";
+import { authErrorResponse, requireRole } from "@/lib/auth/session";
+import { toCsv } from "@/lib/csv";
+import type { Dish } from "@/lib/types";
+
+export async function GET() {
+  try {
+    await requireRole(["staff", "admin"]);
+    const dishes = await query<Dish>("select * from dishes order by name");
+    const rows = [
+      ["name", "name_en", "name_pl", "price", "allergens", "additives"],
+      ...dishes.map((d) => [
+        d.name,
+        d.name_en ?? "",
+        d.name_pl ?? "",
+        String(d.price),
+        (d.allergens ?? []).join(";"),
+        (d.additives ?? []).join(";"),
+      ]),
+    ];
+    return new Response(toCsv(rows), {
+      headers: {
+        "Content-Type": "text/csv; charset=utf-8",
+        "Content-Disposition": 'attachment; filename="gerichte.csv"',
+      },
+    });
+  } catch (err) {
+    const res = authErrorResponse(err);
+    if (res) return res;
+    throw err;
+  }
+}

app/api/dishes/import/route.ts

@@ -0,0 +1,110 @@
+import { NextResponse } from "next/server";
+import { withTransaction } from "@/lib/db";
+import { authErrorResponse, requireRole } from "@/lib/auth/session";
+import { isSameOrigin } from "@/lib/origin";
+import { parseCsvWithHeader, splitCodes } from "@/lib/csv";
+
+interface ImportRow {
+  rowNum: number;
+  name: string;
+  name_en: string | null;
+  name_pl: string | null;
+  price: number;
+  allergens: string[];
+  additives: string[];
+}
+
+export async function POST(request: Request) {
+  if (!isSameOrigin(request)) {
+    return NextResponse.json({ error: "Nicht erlaubt." }, { status: 403 });
+  }
+  try {
+    await requireRole(["staff", "admin"]);
+    const form = await request.formData();
+    const file = form.get("file");
+    if (!(file instanceof File)) {
+      return NextResponse.json({ error: "invalid_input" }, { status: 400 });
+    }
+
+    const { header, rows: cells } = parseCsvWithHeader(await file.text());
+    const nameIdx = header.indexOf("name");
+    const priceIdx = header.indexOf("price");
+    if (nameIdx === -1 || priceIdx === -1) {
+      return NextResponse.json({ error: "missing_columns" }, { status: 400 });
+    }
+    const nameEnIdx = header.indexOf("name_en");
+    const namePlIdx = header.indexOf("name_pl");
+    const allergensIdx = header.indexOf("allergens");
+    const additivesIdx = header.indexOf("additives");
+
+    const rows: ImportRow[] = [];
+    const skipped: { row: number; reason: string }[] = [];
+    cells.forEach((c, i) => {
+      const rowNum = i + 2; // 1-indexiert + Kopfzeile
+      const name = (c[nameIdx] ?? "").trim();
+      if (!name) {
+        skipped.push({ row: rowNum, reason: "Name fehlt" });
+        return;
+      }
+      const priceRaw = (c[priceIdx] ?? "").trim().replace(",", ".");
+      const price = Number.parseFloat(priceRaw);
+      if (Number.isNaN(price) || price < 0) {
+        skipped.push({ row: rowNum, reason: `Ungültiger Preis „${c[priceIdx] ?? ""}“` });
+        return;
+      }
+      rows.push({
+        rowNum,
+        name,
+        name_en: nameEnIdx >= 0 ? c[nameEnIdx]?.trim() || null : null,
+        name_pl: namePlIdx >= 0 ? c[namePlIdx]?.trim() || null : null,
+        price,
+        allergens: allergensIdx >= 0 ? splitCodes(c[allergensIdx]) : [],
+        additives: additivesIdx >= 0 ? splitCodes(c[additivesIdx]) : [],
+      });
+    });
+
+    let created = 0;
+    let updated = 0;
+    if (rows.length > 0) {
+      await withTransaction(async (client) => {
+        for (const row of rows) {
+          // Gerichtsnamen sind nicht eindeutig (keine DB-Constraint) – bei
+          // mehreren Treffern lieber überspringen als versehentlich alle
+          // gleichnamigen Gerichte mit denselben Werten zu überschreiben.
+          const existing = await client.query<{ id: string }>(
+            "select id from dishes where name = $1",
+            [row.name]
+          );
+          if (existing.rows.length > 1) {
+            skipped.push({
+              row: row.rowNum,
+              reason: `„${row.name}“ ist mehrdeutig (mehrere Gerichte mit diesem Namen) – übersprungen`,
+            });
+            continue;
+          }
+          if (existing.rows.length === 1) {
+            await client.query(
+              `update dishes set name_en = $1, name_pl = $2, price = $3, allergens = $4, additives = $5
+               where id = $6`,
+              [row.name_en, row.name_pl, row.price, row.allergens, row.additives, existing.rows[0].id]
+            );
+            updated++;
+          } else {
+            await client.query(
+              `insert into dishes (name, name_en, name_pl, price, allergens, additives)
+               values ($1, $2, $3, $4, $5, $6)`,
+              [row.name, row.name_en, row.name_pl, row.price, row.allergens, row.additives]
+            );
+            created++;
+          }
+        }
+      });
+    }
+
+    return NextResponse.json({ created, updated, skipped });
+  } catch (err) {
+    const res = authErrorResponse(err);
+    if (res) return res;
+    throw err;
+  }
+}

app/feed.xml/route.ts

@@ -80,12 +80,20 @@ export async function GET() {
       <guid isPermaLink="false">${appUrl}/feed.xml#${iso}</guid>
       <pubDate>${pubDate}</pubDate>
       <description><![CDATA[${dayContent}]]></description>
+      <content:encoded><![CDATA[${dayContent}]]></content:encoded>
     </item>`;
     })
     .join("\n");
 
+  // "description" gilt bei vielen Feed-Readern (Thunderbird, Outlook,
+  // etliche Apps) als reine Kurzfassung/Vorschau und wird eigenmächtig
+  // gekürzt – dadurch war z. B. bei mehreren Essenszeiten pro Tag oft nur
+  // die erste sichtbar. "content:encoded" (RSS-Content-Modul) gilt als
+  // vollständiger Artikeltext und wird von den meisten Readern
+  // ungekürzt angezeigt, wenn vorhanden – redundant zu description für
+  // Reader ohne Unterstützung des Moduls.
   const xml = `<?xml version="1.0" encoding="UTF-8"?>
-<rss version="2.0">
+<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">
   <channel>
     <title>${escapeXml(SITE_TITLE)} – Speiseplan</title>
     <link>${appUrl}</link>

components/CodeListManager.tsx

@@ -34,6 +34,8 @@ export default function CodeListManager({
     namePl: string;
   } | null>(null);
   const [error, setError] = useState<string | null>(null);
+  const [notice, setNotice] = useState<string | null>(null);
+  const [ioBusy, setIoBusy] = useState(false);
   const [translateState, setTranslateState] = useState<"idle" | "busy" | "done">(
     "idle"
   );
@@ -125,12 +127,77 @@ export default function CodeListManager({
     }
   }
 
+  async function exportItems() {
+    setError(null);
+    setNotice(null);
+    const res = await fetch(`/api/${table}/export`);
+    if (!res.ok) {
+      setError(formatMessage(dict.codeList.exportError, { message: String(res.status) }));
+      return;
+    }
+    const blob = await res.blob();
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = table === "allergens" ? "allergene.csv" : "zusatzstoffe.csv";
+    a.click();
+    URL.revokeObjectURL(url);
+  }
+
+  async function importItems(e: React.ChangeEvent<HTMLInputElement>) {
+    const file = e.target.files?.[0];
+    e.target.value = "";
+    if (!file) return;
+    setError(null);
+    setNotice(null);
+    setIoBusy(true);
+    const fd = new FormData();
+    fd.append("file", file);
+    const res = await fetch(`/api/${table}/import`, { method: "POST", body: fd });
+    setIoBusy(false);
+    if (!res.ok) {
+      setError(formatMessage(dict.codeList.importError, { message: String(res.status) }));
+      return;
+    }
+    const data = (await res.json()) as {
+      created: number;
+      updated: number;
+      skipped: { row: number; reason: string }[];
+    };
+    let msg = formatMessage(dict.codeList.importSuccess, {
+      created: data.created,
+      updated: data.updated,
+    });
+    if (data.skipped.length > 0) {
+      const reasons = data.skipped
+        .map((s) => formatMessage(dict.codeList.importSkippedRow, s))
+        .join("; ");
+      msg +=
+        " " + formatMessage(dict.codeList.importSkipped, { count: data.skipped.length, reasons });
+    }
+    setNotice(msg);
+    await load();
+  }
+
   return (
     <section className="card">
       <div className="flex items-center gap-3 mb-3">
         <h2 className="text-lg font-bold text-[var(--c-primary)] mr-auto">
           {title}
         </h2>
+        <button type="button" className="btn btn-neutral" onClick={exportItems}>
+          {dict.codeList.exportButton}
+        </button>
+        <label className="btn btn-neutral cursor-pointer">
+          {dict.codeList.importButton}
+          <input
+            type="file"
+            accept=".csv,text/csv"
+            className="hidden"
+            onChange={importItems}
+            disabled={ioBusy}
+          />
+        </label>
         <button
           type="button"
           className="btn btn-add"
@@ -148,6 +215,7 @@ export default function CodeListManager({
           {error}
         </p>
       )}
+      {notice && <p className="mb-2 text-sm text-green-700">{notice}</p>}
 
       {editing && (
         <form onSubmit={save} className="mb-3 space-y-2 border-b border-gray-200 pb-3">

components/DishManager.tsx

@@ -40,6 +40,8 @@ export default function DishManager({
   const [additives, setAdditives] = useState<CodeItem[]>([]);
   const [form, setForm] = useState<DishForm | null>(null);
   const [error, setError] = useState<string | null>(null);
+  const [notice, setNotice] = useState<string | null>(null);
+  const [ioBusy, setIoBusy] = useState(false);
   const [loading, setLoading] = useState(true);
   const [selected, setSelected] = useState<Set<string>>(new Set());
   const [bulkBusy, setBulkBusy] = useState(false);
@@ -219,6 +221,58 @@ export default function DishManager({
     }
   }
 
+  async function exportDishes() {
+    setError(null);
+    setNotice(null);
+    const res = await fetch("/api/dishes/export");
+    if (!res.ok) {
+      setError(formatMessage(dict.dishManager.exportError, { message: String(res.status) }));
+      return;
+    }
+    const blob = await res.blob();
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = "gerichte.csv";
+    a.click();
+    URL.revokeObjectURL(url);
+  }
+
+  async function importDishes(e: React.ChangeEvent<HTMLInputElement>) {
+    const file = e.target.files?.[0];
+    e.target.value = "";
+    if (!file) return;
+    setError(null);
+    setNotice(null);
+    setIoBusy(true);
+    const fd = new FormData();
+    fd.append("file", file);
+    const res = await fetch("/api/dishes/import", { method: "POST", body: fd });
+    setIoBusy(false);
+    if (!res.ok) {
+      setError(formatMessage(dict.dishManager.importError, { message: String(res.status) }));
+      return;
+    }
+    const data = (await res.json()) as {
+      created: number;
+      updated: number;
+      skipped: { row: number; reason: string }[];
+    };
+    let msg = formatMessage(dict.dishManager.importSuccess, {
+      created: data.created,
+      updated: data.updated,
+    });
+    if (data.skipped.length > 0) {
+      const reasons = data.skipped
+        .map((s) => formatMessage(dict.dishManager.importSkippedRow, s))
+        .join("; ");
+      msg +=
+        " " + formatMessage(dict.dishManager.importSkipped, { count: data.skipped.length, reasons });
+    }
+    setNotice(msg);
+    await load();
+  }
+
   const allSelected =
     visible.length > 0 && visible.every((d) => selected.has(d.id));
 
@@ -228,6 +282,19 @@ export default function DishManager({
         <h1 className="text-xl font-bold text-[var(--c-primary)] mr-auto">
           {dict.dishManager.title}
         </h1>
+        <button type="button" className="btn btn-neutral" onClick={exportDishes}>
+          {dict.dishManager.exportButton}
+        </button>
+        <label className="btn btn-neutral cursor-pointer">
+          {dict.dishManager.importButton}
+          <input
+            type="file"
+            accept=".csv,text/csv"
+            className="hidden"
+            onChange={importDishes}
+            disabled={ioBusy}
+          />
+        </label>
         <button
           type="button"
           className="btn btn-add"
@@ -245,6 +312,7 @@ export default function DishManager({
           {error}
         </p>
       )}
+      {notice && <p className="mb-3 text-sm text-green-700">{notice}</p>}
 
       {form && (
         <form onSubmit={save} className="card mb-4 space-y-4">

lib/csv.ts

@@ -0,0 +1,98 @@
+import "server-only";
+
+// Minimaler RFC-4180-artiger CSV-Parser/-Serializer für Import/Export der
+// Gerichte-/Allergen-/Zusatzstofflisten. Bewusst ohne npm-Abhängigkeit
+// (Projekt-Stil: kein ORM, keine Validierungs-Library, minimale Deps) –
+// deckt quoted Felder mit eingebetteten Kommas/Anführungszeichen/
+// Zeilenumbrüchen ab, da Gerichtsnamen Kommas enthalten können.
+
+export function parseCsv(text: string): string[][] {
+  const rows: string[][] = [];
+  let row: string[] = [];
+  let field = "";
+  let inQuotes = false;
+  let i = 0;
+  const len = text.length;
+
+  function pushField() {
+    row.push(field);
+    field = "";
+  }
+  function pushRow() {
+    pushField();
+    rows.push(row);
+    row = [];
+  }
+
+  while (i < len) {
+    const c = text[i];
+    if (inQuotes) {
+      if (c === '"') {
+        if (text[i + 1] === '"') {
+          field += '"';
+          i += 2;
+          continue;
+        }
+        inQuotes = false;
+        i++;
+        continue;
+      }
+      field += c;
+      i++;
+      continue;
+    }
+    if (c === '"') {
+      inQuotes = true;
+      i++;
+      continue;
+    }
+    if (c === ",") {
+      pushField();
+      i++;
+      continue;
+    }
+    if (c === "\r") {
+      i++;
+      continue;
+    }
+    if (c === "\n") {
+      pushRow();
+      i++;
+      continue;
+    }
+    field += c;
+    i++;
+  }
+  // Letzte Zeile ohne abschließenden Zeilenumbruch noch anhängen.
+  if (field !== "" || row.length > 0) pushRow();
+  // Leere Zeilen überspringen (z. B. durch einen abschließenden Zeilenumbruch).
+  return rows.filter((r) => !(r.length === 1 && r[0].trim() === ""));
+}
+
+function csvField(value: string): string {
+  if (/[",\r\n]/.test(value)) {
+    return `"${value.replace(/"/g, '""')}"`;
+  }
+  return value;
+}
+
+export function toCsv(rows: string[][]): string {
+  return rows.map((row) => row.map(csvField).join(",")).join("\r\n") + "\r\n";
+}
+
+/** Kopfzeile in Kleinbuchstaben, damit der Import tolerant gegenüber Groß-/
+ *  Kleinschreibung und Spaltenreihenfolge ist. */
+export function parseCsvWithHeader(text: string): { header: string[]; rows: string[][] } {
+  const table = parseCsv(text);
+  if (table.length === 0) return { header: [], rows: [] };
+  const [header, ...rows] = table;
+  return { header: header.map((h) => h.trim().toLowerCase()), rows };
+}
+
+/** Codes einer Zelle wie "A;G;2" in einzelne, getrimmte Kürzel zerlegen. */
+export function splitCodes(cell: string | undefined): string[] {
+  return (cell ?? "")
+    .split(";")
+    .map((c) => c.trim())
+    .filter(Boolean);
+}

lib/db/code-lists.ts

@@ -1,5 +1,5 @@
 import "server-only";
-import { query, queryOne } from "@/lib/db";
+import { query, queryOne, withTransaction } from "@/lib/db";
 import type { CodeItem } from "@/lib/types";
 
 // "allergens"/"additives" sind identisch aufgebaute Tabellen (Kürzel +
@@ -39,3 +39,47 @@ export async function updateCode(
 export async function deleteCode(table: CodeTable, code: string): Promise<void> {
   await query(`delete from ${table} where code = $1`, [code]);
 }
+
+export interface CodeImportRow {
+  code: string;
+  name: string;
+  name_en: string | null;
+  name_pl: string | null;
+}
+
+/** CSV-Import: legt neue Kürzel an, bestehende (gleicher Code) werden
+ *  aktualisiert – ein doppelter Code innerhalb derselben Datei
+ *  aktualisiert also einfach zweimal statt einen Fehler zu werfen. */
+export async function importCodes(
+  table: CodeTable,
+  rows: CodeImportRow[]
+): Promise<{ created: number; updated: number }> {
+  return withTransaction(async (client) => {
+    const existing = await client.query<{ code: string }>(`select code from ${table}`);
+    const known = new Set(existing.rows.map((r) => r.code));
+    const maxRow = await client.query<{ sort: number }>(
+      `select coalesce(max(sort), 0) as sort from ${table}`
+    );
+    let nextSort = (maxRow.rows[0]?.sort ?? 0) + 1;
+    let created = 0;
+    let updated = 0;
+
+    for (const row of rows) {
+      if (known.has(row.code)) {
+        await client.query(
+          `update ${table} set name = $1, name_en = $2, name_pl = $3 where code = $4`,
+          [row.name, row.name_en, row.name_pl, row.code]
+        );
+        updated++;
+      } else {
+        await client.query(
+          `insert into ${table} (code, name, name_en, name_pl, sort) values ($1, $2, $3, $4, $5)`,
+          [row.code, row.name, row.name_en, row.name_pl, nextSort++]
+        );
+        known.add(row.code);
+        created++;
+      }
+    }
+    return { created, updated };
+  });
+}

lib/i18n/dictionaries.ts

@@ -106,6 +106,13 @@ const de = {
     loadError: "Laden fehlgeschlagen: {message}",
     saveError: "Speichern fehlgeschlagen: {message}",
     deleteError: "Löschen fehlgeschlagen: {message}",
+    exportButton: "Exportieren",
+    importButton: "Importieren",
+    exportError: "Export fehlgeschlagen: {message}",
+    importError: "Import fehlgeschlagen: {message}",
+    importSuccess: "{created} neu angelegt, {updated} aktualisiert.",
+    importSkipped: "{count} Zeile(n) übersprungen: {reasons}",
+    importSkippedRow: "Zeile {row}: {reason}",
   },
   codeList: {
     allergensTitle: "Allergene",
@@ -119,6 +126,13 @@ const de = {
     loadError: "Laden fehlgeschlagen: {message}",
     saveError: "Speichern fehlgeschlagen: {message}",
     deleteError: "Löschen fehlgeschlagen: {message}",
+    exportButton: "Exportieren",
+    importButton: "Importieren",
+    exportError: "Export fehlgeschlagen: {message}",
+    importError: "Import fehlgeschlagen: {message}",
+    importSuccess: "{created} neu angelegt, {updated} aktualisiert.",
+    importSkipped: "{count} Zeile(n) übersprungen: {reasons}",
+    importSkippedRow: "Zeile {row}: {reason}",
   },
   sectionManager: {
     title: "Essenszeiten",
@@ -362,6 +376,13 @@ const en: Dict = {
     loadError: "Loading failed: {message}",
     saveError: "Saving failed: {message}",
     deleteError: "Deleting failed: {message}",
+    exportButton: "Export",
+    importButton: "Import",
+    exportError: "Export failed: {message}",
+    importError: "Import failed: {message}",
+    importSuccess: "{created} created, {updated} updated.",
+    importSkipped: "{count} row(s) skipped: {reasons}",
+    importSkippedRow: "Row {row}: {reason}",
   },
   codeList: {
     allergensTitle: "Allergens",
@@ -375,6 +396,13 @@ const en: Dict = {
     loadError: "Loading failed: {message}",
     saveError: "Saving failed: {message}",
     deleteError: "Deleting failed: {message}",
+    exportButton: "Export",
+    importButton: "Import",
+    exportError: "Export failed: {message}",
+    importError: "Import failed: {message}",
+    importSuccess: "{created} created, {updated} updated.",
+    importSkipped: "{count} row(s) skipped: {reasons}",
+    importSkippedRow: "Row {row}: {reason}",
   },
   sectionManager: {
     title: "Meal times",
@@ -616,6 +644,13 @@ const pl: Dict = {
     loadError: "Wczytywanie nie powiodło się: {message}",
     saveError: "Zapisywanie nie powiodło się: {message}",
     deleteError: "Usuwanie nie powiodło się: {message}",
+    exportButton: "Eksportuj",
+    importButton: "Importuj",
+    exportError: "Eksport nie powiódł się: {message}",
+    importError: "Import nie powiódł się: {message}",
+    importSuccess: "Utworzono: {created}, zaktualizowano: {updated}.",
+    importSkipped: "Pominięto wierszy: {count}: {reasons}",
+    importSkippedRow: "Wiersz {row}: {reason}",
   },
   codeList: {
     allergensTitle: "Alergeny",
@@ -629,6 +664,13 @@ const pl: Dict = {
     loadError: "Wczytywanie nie powiodło się: {message}",
     saveError: "Zapisywanie nie powiodło się: {message}",
     deleteError: "Usuwanie nie powiodło się: {message}",
+    exportButton: "Eksportuj",
+    importButton: "Importuj",
+    exportError: "Eksport nie powiódł się: {message}",
+    importError: "Import nie powiódł się: {message}",
+    importSuccess: "Utworzono: {created}, zaktualizowano: {updated}.",
+    importSkipped: "Pominięto wierszy: {count}: {reasons}",
+    importSkippedRow: "Wiersz {row}: {reason}",
   },
   sectionManager: {
     title: "Pory posiłków",

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "canteen-menu",
-  "version": "1.6.3",
+  "version": "1.7.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "canteen-menu",
-      "version": "1.6.3",
+      "version": "1.7.0",
       "dependencies": {
         "@simplewebauthn/browser": "^13.3.0",
         "@simplewebauthn/server": "^13.3.2",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "canteen-menu",
-  "version": "1.6.3",
+  "version": "1.7.0",
   "private": true,
   "scripts": {
     "predev": "node --env-file-if-exists=.env.local db/migrate.mjs && node --env-file-if-exists=.env.local scripts/bootstrap-admin.mjs",