diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index 763cba4..e367d58 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -104,6 +104,7 @@ Fachliche Annahmen, getroffen weil das Lastenheft an der Stelle keine eindeutige
 12. **Automatische Aufgaben sind Vorschläge**: `Task.sourceAutomationTrigger` kennzeichnet von Regeln erzeugte Aufgaben. Je Regel und Objekt existiert höchstens eine offene Aufgabe. Keine voreingestellte Frist (fachlich nicht belastbar ableitbar); optional `config.dueInDays` je Regel. Die Varroa-Schwelle (Milben/Tag) wird nur mit Tagesraten des natürlichen Milbenfalls verglichen.
 14. **API-Schlüssel für Maschinen-Zugriffe**: Integrationen (Wabenhain-Shop) nutzen einen Schlüssel `ack_…` im `Authorization: Bearer`-Header statt eines Service-Kontos mit Passwort. Gespeichert wird nur der SHA-256-Hash (32 Zufallsbytes, daher kein langsamer KDF nötig); der Klartext erscheint einmal bei der Erstellung. Ein Schlüssel ist kein Benutzer: `JwtAuthGuard` setzt `request.apiKey` statt `request.user`, `PermissionsGuard` lässt ihn nur auf Routen, deren Berechtigung in seinen Scopes steht – `@AnyAuthenticatedUser`-Routen nie. Erlaubte Scopes sind eine kurze Allowlist (`api-keys/api-key-scopes.ts`, derzeit nur `shop-sync:read`). Verwaltung mit `api-keys:manage`. Schlüssel sind bewusst nicht Teil des Backups: nach einer Wiederherstellung wird ein neuer Schlüssel ausgestellt.
 13. **Lebende vs. beendete Völker**: Nur `DISSOLVED`, `SOLD`, `DECEASED`, `MERGED` sperren Umsetzen/Teilen/Vereinigen/Königinzuweisung (`colonies/colony-status.ts`). `WEAK`, `CONSPICUOUS`, `QUEENLESS` bleiben bearbeitbar.
+15. **Bestandsbuch aus Behandlungen, nicht als eigenes Register**: Das Bestandsbuch nach Art. 108 VO (EU) 2019/6 wird aus `Treatment` erzeugt (`export/treatment-log.ts`); Lieferant, Erwerbsbeleg und verschreibender Tierarzt sind Freitextfelder der Behandlung, Name/Anschrift des Halters liegen in `SiteSettings`. Der Stand am Behandlungstag wird beim Anlegen als `Treatment.apiaryId` festgehalten (Umsetzen ändert ihn nicht nachträglich); für Altbestand wird er aus `ColonyApiaryHistory` abgeleitet und im PDF bei Unsicherheit markiert. Fehlende Pflichtangaben werden als „FEHLT“ gedruckt statt still weggelassen. Keine Wartezeit-Automatik (siehe 10).
 
 ## 7. Kubernetes
 
diff --git a/ApiCore-Backend/prisma/migrations/20260928043245_bestandsbuch_fields/migration.sql b/ApiCore-Backend/prisma/migrations/20260928043245_bestandsbuch_fields/migration.sql
new file mode 100644
index 0000000..2aea6ee
--- /dev/null
+++ b/ApiCore-Backend/prisma/migrations/20260928043245_bestandsbuch_fields/migration.sql
@@ -0,0 +1,13 @@
+-- AlterTable
+ALTER TABLE "SiteSettings" ADD COLUMN     "holderAddress" TEXT,
+ADD COLUMN     "holderName" TEXT;
+
+-- AlterTable
+ALTER TABLE "Treatment" ADD COLUMN     "apiaryId" TEXT,
+ADD COLUMN     "prescribingVet" TEXT,
+ADD COLUMN     "purchaseProof" TEXT,
+ADD COLUMN     "supplier" TEXT;
+
+-- AddForeignKey
+ALTER TABLE "Treatment" ADD CONSTRAINT "Treatment_apiaryId_fkey" FOREIGN KEY ("apiaryId") REFERENCES "Apiary"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+
diff --git a/ApiCore-Backend/prisma/schema.prisma b/ApiCore-Backend/prisma/schema.prisma
index 82ad6bc..00d5d3d 100644
--- a/ApiCore-Backend/prisma/schema.prisma
+++ b/ApiCore-Backend/prisma/schema.prisma
@@ -205,6 +205,7 @@ model Apiary {
   colonies    Colony[]
   colonyMoves ColonyApiaryHistory[]
   harvests    Harvest[]
+  treatments  Treatment[]
 
   @@index([status])
 }
@@ -615,6 +616,14 @@ model Treatment {
   batchNumber          String?
   notes                String?
   withdrawalPeriodDays Int?
+  // Bestandsbuch (Art. 108 VO (EU) 2019/6): where the colony stood on the
+  // day of the treatment - kept with the treatment because the colony may
+  // be moved later - and the supplier / purchase proof / prescribing vet.
+  apiaryId             String?
+  apiary               Apiary?   @relation(fields: [apiaryId], references: [id])
+  supplier             String?
+  purchaseProof        String?
+  prescribingVet       String?
   createdAt            DateTime  @default(now())
 
   @@index([colonyId, date])
@@ -1102,12 +1111,16 @@ model AutomationRule {
 // site-wide social links exists, and a fixed-id upsert is simpler than
 // enforcing "at most one row" any other way.
 model SiteSettings {
-  id           String   @id @default("singleton")
-  youtubeUrl   String?
-  instagramUrl String?
-  tiktokUrl    String?
-  websiteUrl   String?
-  updatedAt    DateTime @updatedAt
+  id            String   @id @default("singleton")
+  youtubeUrl    String?
+  instagramUrl  String?
+  tiktokUrl     String?
+  websiteUrl    String?
+  // Name and address of the bee keeper, printed on the Bestandsbuch. Never
+  // part of any public page.
+  holderName    String?
+  holderAddress String?
+  updatedAt     DateTime @updatedAt
 }
 
 // ---------------------------------------------------------------------------
diff --git a/ApiCore-Backend/src/export/colony-record-card.ts b/ApiCore-Backend/src/export/colony-record-card.ts
index 76ba97a..cbf3258 100644
--- a/ApiCore-Backend/src/export/colony-record-card.ts
+++ b/ApiCore-Backend/src/export/colony-record-card.ts
@@ -1,6 +1,14 @@
 import { NotFoundException } from '@nestjs/common';
 import PDFDocument from 'pdfkit';
 import { PrismaService } from '../prisma/prisma.service';
+import {
+  PDF_MARGIN,
+  drawSection,
+  drawTable,
+  fillWidth,
+  formatDay,
+  orDash,
+} from './pdf-table';
 
 /**
  * Stockkarte: the complete written record of one colony - master data, queen,
@@ -242,109 +250,14 @@ export async function buildColonyRecordCard(
 // Rendering
 // ---------------------------------------------------------------------------
 
-const MARGIN = 36;
-
-function day(date: Date): string {
-  return date.toLocaleDateString('de-DE', {
-    day: '2-digit',
-    month: '2-digit',
-    year: 'numeric',
-    timeZone: 'UTC',
-  });
-}
+const MARGIN = PDF_MARGIN;
+const day = formatDay;
+const section = drawSection;
 
 function yesNo(value: boolean | null): string {
   return value === null ? '–' : value ? 'ja' : 'nein';
 }
 
-function orDash(value: string | number | null | undefined): string {
-  return value === null || value === undefined || value === ''
-    ? '–'
-    : String(value);
-}
-
-interface Column {
-  header: string;
-  width: number;
-}
-
-/** Draws a simple table, repeating the header on every new page. */
-function drawTable(
-  doc: PDFKit.PDFDocument,
-  columns: Column[],
-  rows: string[][],
-): void {
-  const left = MARGIN;
-  const bottomLimit = doc.page.height - MARGIN - 20;
-
-  const drawRow = (cells: string[], bold: boolean) => {
-    doc.font(bold ? 'Helvetica-Bold' : 'Helvetica').fontSize(8);
-    const heights = cells.map((cell, index) =>
-      doc.heightOfString(cell, { width: columns[index].width - 4 }),
-    );
-    const rowHeight = Math.max(...heights, 10) + 4;
-    if (doc.y + rowHeight > bottomLimit) {
-      doc.addPage();
-      if (!bold) {
-        drawRow(
-          columns.map((c) => c.header),
-          true,
-        );
-        doc.font('Helvetica').fontSize(8);
-      }
-    }
-    const top = doc.y;
-    let x = left;
-    cells.forEach((cell, index) => {
-      doc.text(cell, x + 2, top + 2, { width: columns[index].width - 4 });
-      x += columns[index].width;
-    });
-    doc
-      .moveTo(left, top + rowHeight)
-      .lineTo(x, top + rowHeight)
-      .lineWidth(0.3)
-      .strokeColor('#999999')
-      .stroke();
-    doc.y = top + rowHeight;
-  };
-
-  drawRow(
-    columns.map((c) => c.header),
-    true,
-  );
-  if (rows.length === 0) {
-    doc
-      .font('Helvetica-Oblique')
-      .fontSize(8)
-      .text('Keine Einträge.', left + 2, doc.y + 2);
-    doc.moveDown(0.5);
-    return;
-  }
-  for (const row of rows) drawRow(row, false);
-  doc.moveDown(0.5);
-}
-
-function section(doc: PDFKit.PDFDocument, title: string): void {
-  if (doc.y > doc.page.height - MARGIN - 80) doc.addPage();
-  doc.moveDown(0.6);
-  doc
-    .font('Helvetica-Bold')
-    .fontSize(11)
-    .fillColor('#000000')
-    .text(title, MARGIN);
-  doc.moveDown(0.2);
-}
-
-/** Widens the last column to fill the page. */
-function fillWidth(doc: PDFKit.PDFDocument, columns: Column[]): Column[] {
-  const fixed = columns.slice(0, -1).reduce((sum, c) => sum + c.width, 0);
-  const last = columns[columns.length - 1];
-  return [
-    ...columns.slice(0, -1),
-    { ...last, width: doc.page.width - 2 * MARGIN - fixed },
-  ];
-}
-
 export function renderColonyRecordCardPdf(
   card: ColonyRecordCard,
 ): Promise<Buffer> {
diff --git a/ApiCore-Backend/src/export/export.service.ts b/ApiCore-Backend/src/export/export.service.ts
index 70ff941..0870c4d 100644
--- a/ApiCore-Backend/src/export/export.service.ts
+++ b/ApiCore-Backend/src/export/export.service.ts
@@ -4,6 +4,7 @@ import {
   buildColonyRecordCard,
   renderColonyRecordCardPdf,
 } from './colony-record-card';
+import { buildTreatmentLog, renderTreatmentLogPdf } from './treatment-log';
 import { PrismaService } from '../prisma/prisma.service';
 import { HoneyBatchesService } from '../honey-batches/honey-batches.service';
 import {
@@ -27,6 +28,7 @@ const PDF_REPORTS = [
   'colony-annual-report',
   'apiary-annual-report',
   'colony-record-card',
+  'treatment-log',
 ] as const;
 type PdfReport = (typeof PDF_REPORTS)[number];
 
@@ -207,6 +209,14 @@ export class ExportService {
         );
         return renderColonyRecordCardPdf(card);
       }
+      case 'treatment-log': {
+        const log = await buildTreatmentLog(
+          this.prisma,
+          resolveYear(options.year),
+          options.apiaryId,
+        );
+        return renderTreatmentLogPdf(log);
+      }
     }
   }
 
diff --git a/ApiCore-Backend/src/export/pdf-table.ts b/ApiCore-Backend/src/export/pdf-table.ts
new file mode 100644
index 0000000..4e159e0
--- /dev/null
+++ b/ApiCore-Backend/src/export/pdf-table.ts
@@ -0,0 +1,107 @@
+/**
+ * Small pdfkit helpers shared by the printable records (Stockkarte,
+ * Bestandsbuch): dates, empty values and a table that repeats its header on
+ * every page.
+ */
+
+export const PDF_MARGIN = 36;
+
+export interface PdfColumn {
+  header: string;
+  width: number;
+}
+
+export function formatDay(date: Date): string {
+  return date.toLocaleDateString('de-DE', {
+    day: '2-digit',
+    month: '2-digit',
+    year: 'numeric',
+    timeZone: 'UTC',
+  });
+}
+
+export function orDash(value: string | number | null | undefined): string {
+  return value === null || value === undefined || value === ''
+    ? '–'
+    : String(value);
+}
+
+/** Widens the last column so the table fills the page width. */
+export function fillWidth(
+  doc: PDFKit.PDFDocument,
+  columns: PdfColumn[],
+): PdfColumn[] {
+  const fixed = columns.slice(0, -1).reduce((sum, c) => sum + c.width, 0);
+  const last = columns[columns.length - 1];
+  return [
+    ...columns.slice(0, -1),
+    { ...last, width: doc.page.width - 2 * PDF_MARGIN - fixed },
+  ];
+}
+
+export function drawSection(doc: PDFKit.PDFDocument, title: string): void {
+  if (doc.y > doc.page.height - PDF_MARGIN - 80) doc.addPage();
+  doc.moveDown(0.6);
+  doc
+    .font('Helvetica-Bold')
+    .fontSize(11)
+    .fillColor('#000000')
+    .text(title, PDF_MARGIN);
+  doc.moveDown(0.2);
+}
+
+/** Draws a simple table, repeating the header on every new page. */
+export function drawTable(
+  doc: PDFKit.PDFDocument,
+  columns: PdfColumn[],
+  rows: string[][],
+): void {
+  const left = PDF_MARGIN;
+  const bottomLimit = doc.page.height - PDF_MARGIN - 20;
+
+  const drawRow = (cells: string[], bold: boolean) => {
+    doc.font(bold ? 'Helvetica-Bold' : 'Helvetica').fontSize(8);
+    const heights = cells.map((cell, index) =>
+      doc.heightOfString(cell, { width: columns[index].width - 4 }),
+    );
+    const rowHeight = Math.max(...heights, 10) + 4;
+    if (doc.y + rowHeight > bottomLimit) {
+      doc.addPage();
+      if (!bold) {
+        drawRow(
+          columns.map((c) => c.header),
+          true,
+        );
+        doc.font('Helvetica').fontSize(8);
+      }
+    }
+    const top = doc.y;
+    let x = left;
+    cells.forEach((cell, index) => {
+      doc.text(cell, x + 2, top + 2, { width: columns[index].width - 4 });
+      x += columns[index].width;
+    });
+    doc
+      .moveTo(left, top + rowHeight)
+      .lineTo(x, top + rowHeight)
+      .lineWidth(0.3)
+      .strokeColor('#999999')
+      .stroke();
+    doc.y = top + rowHeight;
+  };
+
+  drawRow(
+    columns.map((c) => c.header),
+    true,
+  );
+  if (rows.length === 0) {
+    doc
+      .font('Helvetica-Oblique')
+      .fontSize(8)
+      .text('Keine Einträge.', left + 2, doc.y + 2);
+    doc.moveDown(0.5);
+    return;
+  }
+  for (const row of rows) drawRow(row, false);
+  doc.moveDown(0.5);
+}
diff --git a/ApiCore-Backend/src/export/treatment-log.spec.ts b/ApiCore-Backend/src/export/treatment-log.spec.ts
new file mode 100644
index 0000000..ef2a86b
--- /dev/null
+++ b/ApiCore-Backend/src/export/treatment-log.spec.ts
@@ -0,0 +1,126 @@
+import {
+  apiaryOnDate,
+  groupTreatmentLog,
+  TreatmentLogSource,
+} from './treatment-log';
+
+const d = (value: string) => new Date(`${value}T00:00:00.000Z`);
+
+function source(overrides: Partial<TreatmentLogSource>): TreatmentLogSource {
+  return {
+    id: 't',
+    colonyId: 'c1',
+    colonyCode: 'V-01',
+    colonyApiaryId: 'today',
+    apiaryId: null,
+    date: d('2026-08-01'),
+    startDate: null,
+    endDate: null,
+    product: 'Oxalsäure',
+    amount: '30 ml',
+    batchNumber: 'B1',
+    supplier: 'Imkereibedarf X',
+    purchaseProof: 'Rechnung 1',
+    prescribingVet: null,
+    withdrawalPeriodDays: 0,
+    administeredBy: 'Imker',
+    ...overrides,
+  };
+}
+
+describe('apiaryOnDate', () => {
+  it('uses the apiary stored with the treatment', () => {
+    expect(apiaryOnDate(source({ apiaryId: 'stored' }), [])).toEqual({
+      apiaryId: 'stored',
+      uncertain: false,
+    });
+  });
+
+  it('uses the last move on or before the treatment day', () => {
+    const moves = [
+      { colonyId: 'c1', apiaryId: 'summer', movedAt: d('2026-05-01') },
+      { colonyId: 'c1', apiaryId: 'winter', movedAt: d('2026-10-01') },
+    ];
+    expect(apiaryOnDate(source({}), moves)).toEqual({
+      apiaryId: 'summer',
+      uncertain: false,
+    });
+  });
+
+  it('flags the location when the colony was only moved after the treatment', () => {
+    const moves = [
+      { colonyId: 'c1', apiaryId: 'today', movedAt: d('2026-09-01') },
+    ];
+    expect(apiaryOnDate(source({}), moves)).toEqual({
+      apiaryId: 'today',
+      uncertain: true,
+    });
+  });
+
+  it('trusts today when the colony was never moved', () => {
+    expect(apiaryOnDate(source({}), [])).toEqual({
+      apiaryId: 'today',
+      uncertain: false,
+    });
+  });
+});
+
+describe('groupTreatmentLog', () => {
+  it('puts identical treatments of several colonies into one row, per apiary', () => {
+    const sheets = groupTreatmentLog(
+      [
+        source({ id: '1', colonyId: 'c1', colonyCode: 'V-02', apiaryId: 'a' }),
+        source({ id: '2', colonyId: 'c2', colonyCode: 'V-01', apiaryId: 'a' }),
+        source({ id: '3', colonyId: 'c3', colonyCode: 'V-09', apiaryId: 'b' }),
+        source({
+          id: '4',
+          colonyId: 'c4',
+          colonyCode: 'V-03',
+          apiaryId: 'a',
+          amount: '50 ml',
+        }),
+      ],
+      [],
+    );
+
+    const sheetA = sheets.find((sheet) => sheet.apiaryId === 'a');
+    expect(sheetA?.rows).toHaveLength(2);
+    expect(sheetA?.rows[0].colonyCodes).toEqual(['V-01', 'V-02']);
+    expect(sheets.find((sheet) => sheet.apiaryId === 'b')?.rows).toHaveLength(
+      1,
+    );
+  });
+
+  it('computes the treatment duration in days, inclusive', () => {
+    const [sheet] = groupTreatmentLog(
+      [
+        source({
+          apiaryId: 'a',
+          startDate: d('2026-08-01'),
+          endDate: d('2026-08-14'),
+        }),
+      ],
+      [],
+    );
+    expect(sheet.rows[0].durationDays).toBe(14);
+  });
+
+  it('keeps missing mandatory fields empty so the PDF can flag them', () => {
+    const [sheet] = groupTreatmentLog(
+      [
+        source({
+          apiaryId: 'a',
+          supplier: null,
+          purchaseProof: null,
+          withdrawalPeriodDays: null,
+        }),
+      ],
+      [],
+    );
+    expect(sheet.rows[0]).toMatchObject({
+      supplier: null,
+      purchaseProof: null,
+      withdrawalPeriodDays: null,
+    });
+  });
+});
diff --git a/ApiCore-Backend/src/export/treatment-log.ts b/ApiCore-Backend/src/export/treatment-log.ts
new file mode 100644
index 0000000..4ff74b5
--- /dev/null
+++ b/ApiCore-Backend/src/export/treatment-log.ts
@@ -0,0 +1,353 @@
+import PDFDocument from 'pdfkit';
+import { PrismaService } from '../prisma/prisma.service';
+import {
+  PDF_MARGIN,
+  drawTable,
+  fillWidth,
+  formatDay,
+  orDash,
+} from './pdf-table';
+
+/**
+ * Bestandsbuch: record of every veterinary medicine applied to bees, as
+ * required for food-producing animals by Art. 108 Regulation (EU) 2019/6 -
+ * for every product, including over-the-counter formic or oxalic acid. The
+ * columns follow the model sheet of the German veterinary authorities
+ * (Veterinäramt Kassel, "Buchführung über die Anwendung von TAM bei
+ * Bienen", March 2026): one sheet per apiary; colonies, product, supplier
+ * and purchase proof, date and duration, amount, withdrawal period (also
+ * when 0), administering person. Keep 5 years, as well as purchase proofs.
+ *
+ * Missing mandatory information is printed as "FEHLT" so it can be added
+ * before an inspection, instead of silently leaving a gap.
+ */
+
+export const MISSING = 'FEHLT';
+
+export interface TreatmentLogSource {
+  id: string;
+  colonyId: string;
+  colonyCode: string;
+  colonyApiaryId: string;
+  /** Apiary recorded with the treatment (set since this report exists). */
+  apiaryId: string | null;
+  date: Date;
+  startDate: Date | null;
+  endDate: Date | null;
+  product: string;
+  amount: string | null;
+  batchNumber: string | null;
+  supplier: string | null;
+  purchaseProof: string | null;
+  prescribingVet: string | null;
+  withdrawalPeriodDays: number | null;
+  administeredBy: string;
+}
+
+export interface ColonyMove {
+  colonyId: string;
+  apiaryId: string;
+  movedAt: Date;
+}
+
+export interface TreatmentLogRow {
+  colonyCodes: string[];
+  product: string;
+  batchNumber: string | null;
+  supplier: string | null;
+  prescribingVet: string | null;
+  purchaseProof: string | null;
+  date: Date;
+  endDate: Date | null;
+  durationDays: number;
+  amount: string | null;
+  withdrawalPeriodDays: number | null;
+  administeredBy: string;
+  /** Apiary derived from today's assignment, not known for that date. */
+  locationUncertain: boolean;
+}
+
+export interface TreatmentLogSheet {
+  apiaryId: string;
+  rows: TreatmentLogRow[];
+}
+
+/**
+ * Where the colony stood on the day of the treatment: the apiary stored with
+ * the treatment, else the last recorded move on or before that day. Before
+ * the first recorded move the original apiary is not known - then today's
+ * apiary is used and the row is flagged.
+ */
+export function apiaryOnDate(
+  source: TreatmentLogSource,
+  moves: ColonyMove[],
+): { apiaryId: string; uncertain: boolean } {
+  if (source.apiaryId) return { apiaryId: source.apiaryId, uncertain: false };
+  const colonyMoves = moves
+    .filter((move) => move.colonyId === source.colonyId)
+    .sort((a, b) => a.movedAt.getTime() - b.movedAt.getTime());
+  const before = colonyMoves.filter(
+    (move) => move.movedAt.getTime() <= source.date.getTime(),
+  );
+  if (before.length > 0) {
+    return { apiaryId: before[before.length - 1].apiaryId, uncertain: false };
+  }
+  return { apiaryId: source.colonyApiaryId, uncertain: colonyMoves.length > 0 };
+}
+
+function durationDays(start: Date, end: Date | null): number {
+  if (!end) return 1;
+  const days = Math.round((end.getTime() - start.getTime()) / 86_400_000) + 1;
+  return Math.max(days, 1);
+}
+
+/**
+ * One sheet per apiary; treatments that are identical except for the colony
+ * (same day, product, batch, amount, supplier, person) become one row listing
+ * all colonies - as in the paper form.
+ */
+export function groupTreatmentLog(
+  sources: TreatmentLogSource[],
+  moves: ColonyMove[],
+): TreatmentLogSheet[] {
+  const sheets = new Map<string, Map<string, TreatmentLogRow>>();
+  const sorted = [...sources].sort(
+    (a, b) =>
+      a.date.getTime() - b.date.getTime() ||
+      a.colonyCode.localeCompare(b.colonyCode, 'de', { numeric: true }),
+  );
+
+  for (const source of sorted) {
+    const { apiaryId, uncertain } = apiaryOnDate(source, moves);
+    const start = source.startDate ?? source.date;
+    const key = [
+      source.date.toISOString(),
+      source.endDate?.toISOString() ?? '',
+      source.product,
+      source.batchNumber ?? '',
+      source.amount ?? '',
+      source.supplier ?? '',
+      source.purchaseProof ?? '',
+      source.prescribingVet ?? '',
+      source.withdrawalPeriodDays ?? '',
+      source.administeredBy,
+      uncertain,
+    ].join('|');
+
+    const rows = sheets.get(apiaryId) ?? new Map<string, TreatmentLogRow>();
+    const existing = rows.get(key);
+    if (existing) {
+      existing.colonyCodes.push(source.colonyCode);
+    } else {
+      rows.set(key, {
+        colonyCodes: [source.colonyCode],
+        product: source.product,
+        batchNumber: source.batchNumber,
+        supplier: source.supplier,
+        prescribingVet: source.prescribingVet,
+        purchaseProof: source.purchaseProof,
+        date: source.date,
+        endDate: source.endDate,
+        durationDays: durationDays(start, source.endDate),
+        amount: source.amount,
+        withdrawalPeriodDays: source.withdrawalPeriodDays,
+        administeredBy: source.administeredBy,
+        locationUncertain: uncertain,
+      });
+    }
+    sheets.set(apiaryId, rows);
+  }
+
+  return [...sheets.entries()].map(([apiaryId, rows]) => ({
+    apiaryId,
+    rows: [...rows.values()],
+  }));
+}
+
+// ---------------------------------------------------------------------------
+// Loading and rendering
+// ---------------------------------------------------------------------------
+
+export interface TreatmentLog {
+  year: number;
+  generatedAt: Date;
+  holderName: string | null;
+  holderAddress: string | null;
+  sheets: (TreatmentLogSheet & {
+    apiaryName: string;
+    apiaryLocation: string | null;
+  })[];
+}
+
+export async function buildTreatmentLog(
+  prisma: PrismaService,
+  year: number,
+  apiaryId?: string,
+): Promise<TreatmentLog> {
+  const treatments = await prisma.treatment.findMany({
+    where: {
+      date: {
+        gte: new Date(Date.UTC(year, 0, 1)),
+        lt: new Date(Date.UTC(year + 1, 0, 1)),
+      },
+    },
+    include: {
+      colony: { select: { code: true, apiaryId: true } },
+      user: { select: { name: true } },
+    },
+  });
+  const colonyIds = [...new Set(treatments.map((t) => t.colonyId))];
+  const [moves, settings, apiaries] = await Promise.all([
+    prisma.colonyApiaryHistory.findMany({
+      where: { colonyId: { in: colonyIds } },
+      select: { colonyId: true, apiaryId: true, movedAt: true },
+    }),
+    prisma.siteSettings.findUnique({ where: { id: 'singleton' } }),
+    prisma.apiary.findMany({
+      select: { id: true, name: true, location: true, address: true },
+    }),
+  ]);
+
+  const sheets = groupTreatmentLog(
+    treatments.map((t) => ({
+      id: t.id,
+      colonyId: t.colonyId,
+      colonyCode: t.colony.code,
+      colonyApiaryId: t.colony.apiaryId,
+      apiaryId: t.apiaryId,
+      date: t.date,
+      startDate: t.startDate,
+      endDate: t.endDate,
+      product: t.product,
+      amount: t.amount,
+      batchNumber: t.batchNumber,
+      supplier: t.supplier,
+      purchaseProof: t.purchaseProof,
+      prescribingVet: t.prescribingVet,
+      withdrawalPeriodDays: t.withdrawalPeriodDays,
+      administeredBy: t.user.name,
+    })),
+    moves,
+  ).filter((sheet) => !apiaryId || sheet.apiaryId === apiaryId);
+
+  const apiaryById = new Map(apiaries.map((a) => [a.id, a]));
+  return {
+    year,
+    generatedAt: new Date(),
+    holderName: settings?.holderName ?? null,
+    holderAddress: settings?.holderAddress ?? null,
+    sheets: sheets
+      .map((sheet) => {
+        const apiary = apiaryById.get(sheet.apiaryId);
+        return {
+          ...sheet,
+          apiaryName: apiary?.name ?? 'Unbekannter Stand',
+          apiaryLocation: apiary?.address ?? apiary?.location ?? null,
+        };
+      })
+      .sort((a, b) => a.apiaryName.localeCompare(b.apiaryName, 'de')),
+  };
+}
+
+function orMissing(value: string | number | null | undefined): string {
+  return value === null || value === undefined || value === ''
+    ? MISSING
+    : String(value);
+}
+
+function renderSheet(
+  doc: PDFKit.PDFDocument,
+  log: TreatmentLog,
+  sheet: TreatmentLog['sheets'][number] | null,
+): void {
+  doc
+    .font('Helvetica-Bold')
+    .fontSize(14)
+    .text(
+      'Buchführung (Bestandsbuch) über die Anwendung von Tierarzneimitteln bei Bienen',
+      PDF_MARGIN,
+      PDF_MARGIN,
+    );
+  doc.font('Helvetica').fontSize(9);
+  doc.text(
+    `Jahr ${log.year} · erstellt am ${formatDay(log.generatedAt)} · Art. 108 VO (EU) 2019/6`,
+  );
+  doc.moveDown(0.4);
+  doc.text(
+    `Name und Anschrift des Bienenhalters: ${
+      log.holderName || log.holderAddress
+        ? [log.holderName, log.holderAddress].filter(Boolean).join(', ')
+        : `${MISSING} (in ApiCore unter Verwaltung → Automatisierung → Stammdaten & Web eintragen)`
+    }`,
+  );
+  if (sheet) {
+    doc.text(
+      `Standort der Bienen: ${sheet.apiaryName}${sheet.apiaryLocation ? `, ${sheet.apiaryLocation}` : ''}`,
+    );
+  }
+  doc.moveDown(0.5);
+
+  if (!sheet) {
+    doc.text(`Im Jahr ${log.year} wurden keine Behandlungen erfasst.`);
+    return;
+  }
+
+  const uncertain = sheet.rows.some((row) => row.locationUncertain);
+  drawTable(
+    doc,
+    fillWidth(doc, [
+      { header: 'Anzahl und Nummern der Völker', width: 110 },
+      { header: 'Arzneimittel (Handelsname), Ch.-B.', width: 120 },
+      { header: 'a) Lieferant (Name, Anschrift), ggf. Tierarzt', width: 150 },
+      { header: 'b) Beleg für den Erwerb', width: 110 },
+      { header: 'Datum der Verabreichung, Dauer', width: 90 },
+      { header: 'Verabreichte Menge', width: 70 },
+      { header: 'Wartezeit (Tage)', width: 50 },
+      { header: 'Anwendende Person', width: 0 },
+    ]),
+    sheet.rows.map((row) => [
+      `${row.colonyCodes.length} Volk/Völker: ${row.colonyCodes.join(', ')}${row.locationUncertain ? ' *' : ''}`,
+      `${row.product}${row.batchNumber ? ` (Ch.-B. ${row.batchNumber})` : ''}`,
+      `${orMissing(row.supplier)}${row.prescribingVet ? `; Tierarzt: ${row.prescribingVet}` : ''}`,
+      orMissing(row.purchaseProof),
+      `${formatDay(row.date)}${row.endDate ? ` – ${formatDay(row.endDate)}` : ''}, ${row.durationDays} Tag(e)`,
+      orMissing(row.amount),
+      orMissing(row.withdrawalPeriodDays),
+      orDash(row.administeredBy),
+    ]),
+  );
+  doc.font('Helvetica').fontSize(7);
+  if (uncertain) {
+    doc.text(
+      '* Standort aus der heutigen Zuordnung ermittelt: das Volk wurde später umgesetzt, der Stand am Behandlungstag ist nicht erfasst. Bitte prüfen.',
+      PDF_MARGIN,
+    );
+  }
+  doc.text(
+    `"${MISSING}" = Pflichtangabe fehlt – bitte in der Behandlung nachtragen. Bestandsbuch und Erwerbsbelege 5 Jahre aufbewahren (Art. 108 Abs. 5 VO (EU) 2019/6).`,
+    PDF_MARGIN,
+  );
+}
+
+export function renderTreatmentLogPdf(log: TreatmentLog): Promise<Buffer> {
+  return new Promise((resolve, reject) => {
+    const doc = new PDFDocument({
+      size: 'A4',
+      layout: 'landscape',
+      margin: PDF_MARGIN,
+    });
+    const chunks: Buffer[] = [];
+    doc.on('data', (chunk: Buffer) => chunks.push(chunk));
+    doc.on('end', () => resolve(Buffer.concat(chunks)));
+    doc.on('error', reject);
+
+    if (log.sheets.length === 0) {
+      renderSheet(doc, log, null);
+    }
+    log.sheets.forEach((sheet, index) => {
+      if (index > 0) doc.addPage();
+      renderSheet(doc, log, sheet);
+    });
+    doc.end();
+  });
+}
diff --git a/ApiCore-Backend/src/public/public.service.spec.ts b/ApiCore-Backend/src/public/public.service.spec.ts
index 3c9561d..2351779 100644
--- a/ApiCore-Backend/src/public/public.service.spec.ts
+++ b/ApiCore-Backend/src/public/public.service.spec.ts
@@ -106,4 +106,33 @@ describe('PublicService', () => {
       tiktok: null,
     });
   });
+
+  it('never exposes the holder name or address kept for the Bestandsbuch', async () => {
+    siteSettings.get.mockResolvedValue({
+      youtubeUrl: null,
+      instagramUrl: null,
+      tiktokUrl: null,
+      websiteUrl: null,
+      holderName: 'Nick Muster',
+      holderAddress: 'Musterweg 3, 86450 Altenmünster',
+    });
+    prisma.bottlingBatch.findUnique.mockResolvedValueOnce({
+      lotNumber: 'WH-2026-001',
+      date: new Date('2026-08-20'),
+      bestBeforeDate: new Date('2028-08-20'),
+      jarSize: 500,
+      product: null,
+      honeyBatch: {
+        honeyType: null,
+        waterContent: null,
+        extraction: { date: null, harvests: [] },
+      },
+    });
+
+    const result = await service.findBatchByLot('WH-2026-001');
+
+    const serialized = JSON.stringify(result);
+    expect(serialized).not.toContain('Nick Muster');
+    expect(serialized).not.toContain('Musterweg');
+  });
 });
diff --git a/ApiCore-Backend/src/site-settings/dto/update-site-settings.dto.ts b/ApiCore-Backend/src/site-settings/dto/update-site-settings.dto.ts
index 6bab41f..41af257 100644
--- a/ApiCore-Backend/src/site-settings/dto/update-site-settings.dto.ts
+++ b/ApiCore-Backend/src/site-settings/dto/update-site-settings.dto.ts
@@ -1,5 +1,11 @@
 import { ApiPropertyOptional } from '@nestjs/swagger';
-import { IsOptional, IsUrl, MaxLength, ValidateIf } from 'class-validator';
+import {
+  IsOptional,
+  IsString,
+  IsUrl,
+  MaxLength,
+  ValidateIf,
+} from 'class-validator';
 
 // An empty string clears the link (stored as null); anything else must be a
 // real URL - ValidateIf skips the @IsUrl check only for the empty-string
@@ -32,4 +38,18 @@ export class UpdateSiteSettingsDto {
   @IsUrl({ require_protocol: true })
   @MaxLength(300)
   websiteUrl?: string;
+
+  @ApiPropertyOptional({ description: 'Name des Bienenhalters (Bestandsbuch)' })
+  @IsOptional()
+  @IsString()
+  @MaxLength(200)
+  holderName?: string;
+
+  @ApiPropertyOptional({
+    description: 'Anschrift des Bienenhalters (Bestandsbuch)',
+  })
+  @IsOptional()
+  @IsString()
+  @MaxLength(300)
+  holderAddress?: string;
 }
diff --git a/ApiCore-Backend/src/site-settings/site-settings.service.ts b/ApiCore-Backend/src/site-settings/site-settings.service.ts
index 6d3e0a9..985b40d 100644
--- a/ApiCore-Backend/src/site-settings/site-settings.service.ts
+++ b/ApiCore-Backend/src/site-settings/site-settings.service.ts
@@ -52,6 +52,14 @@ export class SiteSettingsService {
           dto.websiteUrl !== undefined
             ? emptyToNull(dto.websiteUrl)
             : undefined,
+        holderName:
+          dto.holderName !== undefined
+            ? emptyToNull(dto.holderName.trim())
+            : undefined,
+        holderAddress:
+          dto.holderAddress !== undefined
+            ? emptyToNull(dto.holderAddress.trim())
+            : undefined,
       },
     });
     await this.auditLog.record({
diff --git a/ApiCore-Backend/src/treatments/dto/create-treatment.dto.ts b/ApiCore-Backend/src/treatments/dto/create-treatment.dto.ts
index 4ede718..8c481e3 100644
--- a/ApiCore-Backend/src/treatments/dto/create-treatment.dto.ts
+++ b/ApiCore-Backend/src/treatments/dto/create-treatment.dto.ts
@@ -5,6 +5,7 @@ import {
   IsOptional,
   IsString,
   Min,
+  MaxLength,
 } from 'class-validator';
 
 export class CreateTreatmentDto {
@@ -55,6 +56,31 @@ export class CreateTreatmentDto {
   @IsString()
   batchNumber?: string;
 
+  @ApiPropertyOptional({
+    description: 'Lieferant (Name, Anschrift), z. B. Apotheke oder Fachhandel',
+  })
+  @IsOptional()
+  @IsString()
+  @MaxLength(300)
+  supplier?: string;
+
+  @ApiPropertyOptional({
+    description:
+      'Beleg für den Erwerb, z. B. "Rechnung Nr. 123 vom 01.08.2026"',
+  })
+  @IsOptional()
+  @IsString()
+  @MaxLength(300)
+  purchaseProof?: string;
+
+  @ApiPropertyOptional({
+    description: 'Verschreibender Tierarzt, falls zutreffend',
+  })
+  @IsOptional()
+  @IsString()
+  @MaxLength(300)
+  prescribingVet?: string;
+
   @ApiPropertyOptional()
   @IsOptional()
   @IsString()
diff --git a/ApiCore-Backend/src/treatments/treatments.service.spec.ts b/ApiCore-Backend/src/treatments/treatments.service.spec.ts
index 365e85e..cb07bc9 100644
--- a/ApiCore-Backend/src/treatments/treatments.service.spec.ts
+++ b/ApiCore-Backend/src/treatments/treatments.service.spec.ts
@@ -14,6 +14,7 @@ describe('TreatmentsService', () => {
       create: jest.Mock;
       update: jest.Mock;
     };
+    colony: { findUnique: jest.Mock };
   };
   let auditLog: { record: jest.Mock };
 
@@ -31,6 +32,9 @@ describe('TreatmentsService', () => {
         create: jest.fn(),
         update: jest.fn(),
       },
+      colony: {
+        findUnique: jest.fn().mockResolvedValue({ apiaryId: 'apiary-1' }),
+      },
     };
     auditLog = { record: jest.fn() };
     const calendarSync = { enqueue: jest.fn(), cancel: jest.fn() };
@@ -58,9 +62,20 @@ describe('TreatmentsService', () => {
     );
 
     const [[createArg]] = prisma.treatment.create.mock.calls as [
-      [{ data: { colonyId: string; userId: string; product: string } }],
+      [
+        {
+          data: {
+            colonyId: string;
+            userId: string;
+            product: string;
+            apiaryId: string;
+          };
+        },
+      ],
     ];
     expect(createArg.data.colonyId).toBe('colony-1');
+    // The apiary is kept with the treatment for the Bestandsbuch.
+    expect(createArg.data.apiaryId).toBe('apiary-1');
     expect(createArg.data.userId).toBe('user-1');
     expect(createArg.data.product).toBe('Ameisensäure');
   });
diff --git a/ApiCore-Backend/src/treatments/treatments.service.ts b/ApiCore-Backend/src/treatments/treatments.service.ts
index aeaca5b..0bdab48 100644
--- a/ApiCore-Backend/src/treatments/treatments.service.ts
+++ b/ApiCore-Backend/src/treatments/treatments.service.ts
@@ -83,9 +83,19 @@ export class TreatmentsService {
     dto: CreateTreatmentDto,
     actingUserId: string,
   ): Promise<Treatment> {
+    const colony = await this.prisma.colony.findUnique({
+      where: { id: dto.colonyId },
+      select: { apiaryId: true },
+    });
+    if (!colony) {
+      throw new NotFoundException('Colony not found');
+    }
     const treatment = await this.prisma.treatment.create({
       data: {
         ...dto,
+        // Where the colony stands today is where it was treated - kept on the
+        // treatment for the Bestandsbuch, the colony may be moved later.
+        apiaryId: colony.apiaryId,
         date: new Date(dto.date),
         startDate: dto.startDate ? new Date(dto.startDate) : undefined,
         endDate: dto.endDate ? new Date(dto.endDate) : undefined,
@@ -110,10 +120,19 @@ export class TreatmentsService {
     actingUserId: string,
   ): Promise<Treatment> {
     const before = await this.findById(id);
+    // Re-filed to another colony: take that colony's apiary as the location.
+    const movedColony =
+      dto.colonyId !== undefined && dto.colonyId !== before.colonyId
+        ? await this.prisma.colony.findUnique({
+            where: { id: dto.colonyId },
+            select: { apiaryId: true },
+          })
+        : null;
     const treatment = await this.prisma.treatment.update({
       where: { id },
       data: {
         ...dto,
+        apiaryId: movedColony ? movedColony.apiaryId : undefined,
         date: dto.date ? new Date(dto.date) : undefined,
         startDate: dto.startDate ? new Date(dto.startDate) : undefined,
         endDate: dto.endDate ? new Date(dto.endDate) : undefined,
diff --git a/ApiCore-Backend/test/export.e2e-spec.ts b/ApiCore-Backend/test/export.e2e-spec.ts
index 72fab08..9a5133d 100644
--- a/ApiCore-Backend/test/export.e2e-spec.ts
+++ b/ApiCore-Backend/test/export.e2e-spec.ts
@@ -184,6 +184,19 @@ describe('Export (e2e)', () => {
       .expect(404);
   });
 
+  it('renders the Bestandsbuch for a year, also when nothing was treated', async () => {
+    for (const query of ['year=2026', 'year=1999']) {
+      const response = await request(app.getHttpServer())
+        .get(`/api/v1/export/treatment-log.pdf?${query}`)
+        .set('Authorization', `Bearer ${beekeeperToken}`)
+        .expect(200);
+      expect(response.headers['content-type']).toContain('application/pdf');
+      expect(
+        (response.body as Buffer).subarray(0, 4).toString('latin1'),
+      ).toBe('%PDF');
+    }
+  });
+
   it('rejects the apiary annual report without an apiaryId', () => {
     return request(app.getHttpServer())
       .get('/api/v1/export/apiary-annual-report.pdf')
diff --git a/ApiCore-Frontend/src/app/(app)/apiaries/[id]/page.tsx b/ApiCore-Frontend/src/app/(app)/apiaries/[id]/page.tsx
index ee73f3b..b1790a1 100644
--- a/ApiCore-Frontend/src/app/(app)/apiaries/[id]/page.tsx
+++ b/ApiCore-Frontend/src/app/(app)/apiaries/[id]/page.tsx
@@ -5,7 +5,7 @@ import { useParams } from "next/navigation";
 import { useMutation, useQuery } from "@tanstack/react-query";
 import { toast } from "sonner";
 import { fetchApiary } from "@/lib/apiaries/api";
-import { exportApiaryAnnualReportPdf } from "@/lib/export/api";
+import { exportApiaryAnnualReportPdf, exportTreatmentLogPdf } from "@/lib/export/api";
 import { QrCodeDialog } from "@/components/qr-code-dialog";
 import { DocumentUploadCard } from "@/components/document-upload-card";
 import { Button } from "@/components/ui/button";
@@ -26,6 +26,11 @@ export default function ApiaryDetailPage() {
     onError: () => toast.error("Jahresbericht konnte nicht exportiert werden"),
   });
 
+  const treatmentLogMutation = useMutation({
+    mutationFn: () => exportTreatmentLogPdf(CURRENT_YEAR, params.id),
+    onError: () => toast.error("Bestandsbuch konnte nicht erstellt werden. Bitte noch einmal versuchen."),
+  });
+
   if (isLoading) {
     return <p className="p-4 text-sm text-muted-foreground sm:p-6">Lädt…</p>;
   }
@@ -52,6 +57,13 @@ export default function ApiaryDetailPage() {
             >
               Neue Ernte
             </Button>
+            <Button
+              variant="outline"
+              disabled={treatmentLogMutation.isPending}
+              onClick={() => treatmentLogMutation.mutate()}
+            >
+              {treatmentLogMutation.isPending ? "Wird erstellt…" : `Bestandsbuch ${CURRENT_YEAR}`}
+            </Button>
             <Button
               variant="outline"
               disabled={exportReportMutation.isPending}
diff --git a/ApiCore-Frontend/src/app/(app)/colonies/[id]/treatment-edit-dialog.tsx b/ApiCore-Frontend/src/app/(app)/colonies/[id]/treatment-edit-dialog.tsx
index f02e2ed..d09ed5f 100644
--- a/ApiCore-Frontend/src/app/(app)/colonies/[id]/treatment-edit-dialog.tsx
+++ b/ApiCore-Frontend/src/app/(app)/colonies/[id]/treatment-edit-dialog.tsx
@@ -32,6 +32,9 @@ export function TreatmentEditDialog({ treatment }: { treatment: Treatment }) {
   const [method, setMethod] = useState(treatment.method ?? "");
   const [reason, setReason] = useState(treatment.reason ?? "");
   const [batchNumber, setBatchNumber] = useState(treatment.batchNumber ?? "");
+  const [supplier, setSupplier] = useState(treatment.supplier ?? "");
+  const [purchaseProof, setPurchaseProof] = useState(treatment.purchaseProof ?? "");
+  const [prescribingVet, setPrescribingVet] = useState(treatment.prescribingVet ?? "");
   const [notes, setNotes] = useState(treatment.notes ?? "");
   const [withdrawalPeriodDays, setWithdrawalPeriodDays] = useState(
     treatment.withdrawalPeriodDays?.toString() ?? "",
@@ -52,6 +55,9 @@ export function TreatmentEditDialog({ treatment }: { treatment: Treatment }) {
         batchNumber: batchNumber || undefined,
         notes: notes || undefined,
         withdrawalPeriodDays: withdrawalPeriodDays ? Number(withdrawalPeriodDays) : undefined,
+        supplier: supplier.trim(),
+        purchaseProof: purchaseProof.trim(),
+        prescribingVet: prescribingVet.trim(),
       }),
     onSuccess: () => {
       // After re-filing, both the colony it left and the one it joined
@@ -178,6 +184,42 @@ export function TreatmentEditDialog({ treatment }: { treatment: Treatment }) {
               onChange={(event) => setWithdrawalPeriodDays(event.target.value)}
             />
           </div>
+          <fieldset className="flex flex-col gap-3 rounded-xl border border-border p-3">
+            <legend className="px-1 text-sm font-medium">Für das Bestandsbuch</legend>
+            <p className="text-xs text-muted-foreground">
+              Pflicht bei jedem Tierarzneimittel, auch bei freiverkäuflichen Säuren (Art. 108
+              VO (EU) 2019/6). Belege 5 Jahre aufbewahren.
+            </p>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-edit-supplier">Lieferant (Name, Anschrift)</Label>
+              <Input
+                id="treatment-edit-supplier"
+                className="h-11"
+                placeholder="z. B. Imkereibedarf Muster, Hauptstr. 1, 86450 Altenmünster"
+                value={supplier}
+                onChange={(event) => setSupplier(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-edit-proof">Beleg für den Erwerb</Label>
+              <Input
+                id="treatment-edit-proof"
+                className="h-11"
+                placeholder="z. B. Rechnung Nr. 4711 vom 01.08.2026"
+                value={purchaseProof}
+                onChange={(event) => setPurchaseProof(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-edit-vet">Verschreibender Tierarzt (falls zutreffend)</Label>
+              <Input
+                id="treatment-edit-vet"
+                className="h-11"
+                value={prescribingVet}
+                onChange={(event) => setPrescribingVet(event.target.value)}
+              />
+            </div>
+          </fieldset>
           <div className="flex flex-col gap-2">
             <Label htmlFor="treatment-edit-notes">Notizen</Label>
             <Textarea
diff --git a/ApiCore-Frontend/src/app/(app)/settings/automation/page.tsx b/ApiCore-Frontend/src/app/(app)/settings/automation/page.tsx
index e0236ea..2ae3632 100644
--- a/ApiCore-Frontend/src/app/(app)/settings/automation/page.tsx
+++ b/ApiCore-Frontend/src/app/(app)/settings/automation/page.tsx
@@ -26,7 +26,7 @@ const TABS: { value: Tab; label: string }[] = [
   { value: "webhooks", label: "Webhooks" },
   { value: "task-templates", label: "Wiederkehrende Aufgaben" },
   { value: "label-templates", label: "Etikettenvorlagen" },
-  { value: "social-media", label: "Social Media" },
+  { value: "social-media", label: "Stammdaten & Web" },
   { value: "rules", label: "Regeln" },
   { value: "calendar-sync", label: "Kalender-Sync" },
   { value: "api-keys", label: "API-Schlüssel" },
diff --git a/ApiCore-Frontend/src/app/(app)/settings/automation/social-media-tab.tsx b/ApiCore-Frontend/src/app/(app)/settings/automation/social-media-tab.tsx
index 76a9c37..ea3fd72 100644
--- a/ApiCore-Frontend/src/app/(app)/settings/automation/social-media-tab.tsx
+++ b/ApiCore-Frontend/src/app/(app)/settings/automation/social-media-tab.tsx
@@ -18,6 +18,8 @@ function WebsiteSettingsForm({ settings }: { settings: SiteSettings }) {
   const [instagramUrl, setInstagramUrl] = useState(settings.instagramUrl ?? "");
   const [tiktokUrl, setTiktokUrl] = useState(settings.tiktokUrl ?? "");
   const [websiteUrl, setWebsiteUrl] = useState(settings.websiteUrl ?? "");
+  const [holderName, setHolderName] = useState(settings.holderName ?? "");
+  const [holderAddress, setHolderAddress] = useState(settings.holderAddress ?? "");
 
   const mutation = useMutation({
     mutationFn: updateSiteSettings,
@@ -35,6 +37,8 @@ function WebsiteSettingsForm({ settings }: { settings: SiteSettings }) {
       instagramUrl,
       tiktokUrl,
       websiteUrl,
+      holderName,
+      holderAddress,
     });
   }
 
@@ -86,6 +90,28 @@ function WebsiteSettingsForm({ settings }: { settings: SiteSettings }) {
               onChange={(event) => setWebsiteUrl(event.target.value)}
             />
           </div>
+          <fieldset className="flex flex-col gap-3 rounded-xl border border-border p-3">
+            <legend className="px-1 text-sm font-medium">Bienenhalter (für das Bestandsbuch)</legend>
+            <p className="text-xs text-muted-foreground">
+              Erscheint nur im Bestandsbuch, nie auf öffentlichen Seiten.
+            </p>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="site-holder-name">Name</Label>
+              <Input
+                id="site-holder-name"
+                value={holderName}
+                onChange={(event) => setHolderName(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="site-holder-address">Anschrift</Label>
+              <Input
+                id="site-holder-address"
+                value={holderAddress}
+                onChange={(event) => setHolderAddress(event.target.value)}
+              />
+            </div>
+          </fieldset>
           <Button type="submit" disabled={mutation.isPending}>
             {mutation.isPending ? "Wird gespeichert…" : "Speichern"}
           </Button>
diff --git a/ApiCore-Frontend/src/app/(app)/treatments/new/page.tsx b/ApiCore-Frontend/src/app/(app)/treatments/new/page.tsx
index 9169825..251d974 100644
--- a/ApiCore-Frontend/src/app/(app)/treatments/new/page.tsx
+++ b/ApiCore-Frontend/src/app/(app)/treatments/new/page.tsx
@@ -51,6 +51,9 @@ export default function NewTreatmentPage() {
   const [batchNumber, setBatchNumber] = useState("");
   const [notes, setNotes] = useState("");
   const [withdrawalPeriodDays, setWithdrawalPeriodDays] = useState("");
+  const [supplier, setSupplier] = useState("");
+  const [purchaseProof, setPurchaseProof] = useState("");
+  const [prescribingVet, setPrescribingVet] = useState("");
   const [error, setError] = useState<string | null>(null);
 
   // One key per opened form: a double tap or an offline retry of the
@@ -98,6 +101,9 @@ export default function NewTreatmentPage() {
       batchNumber: batchNumber || undefined,
       notes: notes || undefined,
       withdrawalPeriodDays: withdrawalPeriodDays ? Number(withdrawalPeriodDays) : undefined,
+      supplier: supplier.trim() || undefined,
+      purchaseProof: purchaseProof.trim() || undefined,
+      prescribingVet: prescribingVet.trim() || undefined,
     });
   }
 
@@ -229,6 +235,42 @@ export default function NewTreatmentPage() {
                 geerntet werden.
               </p>
             </div>
+            <fieldset className="flex flex-col gap-3 rounded-xl border border-border p-3">
+              <legend className="px-1 text-sm font-medium">Für das Bestandsbuch</legend>
+              <p className="text-xs text-muted-foreground">
+                Pflicht bei jedem Tierarzneimittel, auch bei freiverkäuflichen Säuren (Art. 108
+                VO (EU) 2019/6). Belege 5 Jahre aufbewahren.
+              </p>
+              <div className="flex flex-col gap-2">
+                <Label htmlFor="treatment-supplier">Lieferant (Name, Anschrift)</Label>
+                <Input
+                  id="treatment-supplier"
+                  className="h-11"
+                  placeholder="z. B. Imkereibedarf Muster, Hauptstr. 1, 86450 Altenmünster"
+                  value={supplier}
+                  onChange={(event) => setSupplier(event.target.value)}
+                />
+              </div>
+              <div className="flex flex-col gap-2">
+                <Label htmlFor="treatment-proof">Beleg für den Erwerb</Label>
+                <Input
+                  id="treatment-proof"
+                  className="h-11"
+                  placeholder="z. B. Rechnung Nr. 4711 vom 01.08.2026"
+                  value={purchaseProof}
+                  onChange={(event) => setPurchaseProof(event.target.value)}
+                />
+              </div>
+              <div className="flex flex-col gap-2">
+                <Label htmlFor="treatment-vet">Verschreibender Tierarzt (falls zutreffend)</Label>
+                <Input
+                  id="treatment-vet"
+                  className="h-11"
+                  value={prescribingVet}
+                  onChange={(event) => setPrescribingVet(event.target.value)}
+                />
+              </div>
+            </fieldset>
             <div className="flex flex-col gap-2">
               <Label htmlFor="treatment-notes">Notizen</Label>
               <Textarea
diff --git a/ApiCore-Frontend/src/lib/export/api.ts b/ApiCore-Frontend/src/lib/export/api.ts
index d44cfd6..2e7a559 100644
--- a/ApiCore-Frontend/src/lib/export/api.ts
+++ b/ApiCore-Frontend/src/lib/export/api.ts
@@ -49,6 +49,16 @@ export async function exportColonyRecordCardPdf(colonyId: string, code: string):
   downloadBlob(blob, filename);
 }
 
+/** Bestandsbuch (Art. 108 VO (EU) 2019/6): all treatments of a year, one sheet per apiary. */
+export async function exportTreatmentLogPdf(year: number, apiaryId?: string): Promise<void> {
+  const query = apiaryId ? `year=${year}&apiaryId=${apiaryId}` : `year=${year}`;
+  const { blob, filename } = await apiFetchBlob(
+    `/export/treatment-log.pdf?${query}`,
+    `bestandsbuch-${year}.pdf`,
+  );
+  downloadBlob(blob, filename);
+}
+
 export async function exportApiaryAnnualReportPdf(apiaryId: string, year: number): Promise<void> {
   const { blob, filename } = await apiFetchBlob(
     `/export/apiary-annual-report.pdf?apiaryId=${apiaryId}&year=${year}`,
diff --git a/ApiCore-Frontend/src/lib/site-settings/types.ts b/ApiCore-Frontend/src/lib/site-settings/types.ts
index 791fd72..1aa5cec 100644
--- a/ApiCore-Frontend/src/lib/site-settings/types.ts
+++ b/ApiCore-Frontend/src/lib/site-settings/types.ts
@@ -4,6 +4,8 @@ export interface SiteSettings {
   instagramUrl: string | null;
   tiktokUrl: string | null;
   websiteUrl: string | null;
+  holderName: string | null;
+  holderAddress: string | null;
   updatedAt: string;
 }
 
@@ -12,4 +14,6 @@ export interface UpdateSiteSettingsInput {
   instagramUrl?: string;
   tiktokUrl?: string;
   websiteUrl?: string;
+  holderName?: string;
+  holderAddress?: string;
 }
diff --git a/ApiCore-Frontend/src/lib/treatments/types.ts b/ApiCore-Frontend/src/lib/treatments/types.ts
index 6d79eb0..627a09f 100644
--- a/ApiCore-Frontend/src/lib/treatments/types.ts
+++ b/ApiCore-Frontend/src/lib/treatments/types.ts
@@ -13,6 +13,9 @@ export interface Treatment {
   batchNumber: string | null;
   notes: string | null;
   withdrawalPeriodDays: number | null;
+  supplier: string | null;
+  purchaseProof: string | null;
+  prescribingVet: string | null;
   createdAt: string;
 }
 
@@ -29,6 +32,9 @@ export interface CreateTreatmentInput {
   batchNumber?: string;
   notes?: string;
   withdrawalPeriodDays?: number;
+  supplier?: string;
+  purchaseProof?: string;
+  prescribingVet?: string;
 }
 
 export interface UpdateTreatmentInput {
@@ -45,6 +51,9 @@ export interface UpdateTreatmentInput {
   batchNumber?: string;
   notes?: string;
   withdrawalPeriodDays?: number;
+  supplier?: string;
+  purchaseProof?: string;
+  prescribingVet?: string;
 }
 
 export interface WithdrawalStatus {
diff --git a/docs/pruefung-2026-09.md b/docs/pruefung-2026-09.md
index 4a1fa22..c214dee 100644
--- a/docs/pruefung-2026-09.md
+++ b/docs/pruefung-2026-09.md
@@ -27,11 +27,15 @@ Verifikationsstufen: **CR** = durch Codeprüfung beurteilt, **AT** = automatisie
 | Wabenhain: Sichtbarkeit | Letzter Lauf erkennbar | Nur direkt nach Klick | Niedrig | „Letzter vollständiger Lauf“ im Panel | CR |
 | Start-/Heute-Ansicht | Nächster Schritt klar | Kennzahlen-Kacheln statt Aufgaben | Hoch (UX) | „Als Nächstes“ + „Außerdem heute“, Rückgängig | AT (Logik) + MP |
 | Bewegung | Einstellbar, System respektiert | Nur `motion-safe`-Klassen | Mittel | Voll/Dezent/Aus je Gerät | MP |
+| Etiketten-Schnittmarken | Anlegekante für Papierschneider | Keine Marken, Zuschnitt nach Augenmaß | Mittel | Haarlinien-Marken im Blattrand an jeder Schnittkante, je Vorlage abschaltbar | AT + MP |
+| Folge-Kontrollen | Nachkontrolle nach Maßnahme | Keine | Mittel | Regeln „Nach Behandlung/Fütterung“, standardmäßig aus, Frist „Fällig nach (Tagen)“ | AT |
+| Stockkarte je Volk | Vollständige Historie als PDF | Nur Jahresbericht | Mittel | `colony-record-card.pdf`, optional je Jahr | AT + MP |
+| Bestandsbuch Tierarzneimittel | Pflichtangaben Art. 108 VO (EU) 2019/6 | Lieferant, Erwerbsbeleg, Tierarzt, Standort am Behandlungstag, Halter fehlten | Hoch (Recht) | Felder ergänzt, Stand je Behandlung gespeichert, PDF je Stand, fehlende Pflichtangaben als „FEHLT“ | AT + MP |
 | E2E-Tests | Grün | 23 rot (1 Produktfehler, 3 veraltete Tests) | – | behoben | AT |
 
 ## Prüfungen (letzter Lauf)
 
-- Backend: Typecheck, ESLint, 524 Unit-Tests, 185 E2E-Tests (isolierte Postgres 17), `nest build` – grün.
+- Backend: Typecheck, ESLint, 539 Unit-Tests, 203 E2E-Tests (isolierte Postgres 17), `nest build` – grün.
 - Frontend: Typecheck, ESLint, 44 Tests, `next build` – grün. Design-Detektor (impeccable): 0 Befunde.
 - Wabenhain: Typecheck, ESLint (geänderte Dateien), 538 Tests – grün.
 - Manuell (Browser, lokale Demo-Daten): Login, Heute-Ansicht Desktop/Mobil, Abhaken in Liste und
@@ -56,8 +60,8 @@ Umgesetzt in Wabenhain `d38f430` (AT: Entscheidungslogik; CR: DB-Ablauf der Serv
 ## Nächste Schritte
 
 1. ~~Zuständigkeit pro Feld im Sync~~ – erledigt.
-2. ~~Eigene, versionierte Sync-Schnittstelle~~ – erledigt: `GET /api/v1/shop-sync` (Vertragsversion 1, Feld-Allowlist, Berechtigung `shop-sync:read`). Bewusst ohne „geändert seit“: kleine Datenmenge, Voll-Abgleich heilt verpasste Läufe selbst. Wabenhain nutzt sie seit `5642f0c`, mit Rückfall auf die alten Endpunkte bei HTTP 404.
-3. ~~Nur-Lese-API-Schlüssel~~ – erledigt: Verwaltung → Automatisierung → API-Schlüssel. Nur Hash gespeichert, Klartext einmalig angezeigt, Scope nur `shop-sync:read`, widerrufbar, optional befristet, „zuletzt benutzt“ sichtbar. Wabenhain liest `APICORE_API_KEY` (Passwort-Login bleibt Rückfall).
+2. ~~Eigene, versionierte Sync-Schnittstelle~~ – erledigt: `GET /api/v1/shop-sync` (Vertragsversion 1, Feld-Allowlist, Berechtigung `shop-sync:read`). Bewusst ohne „geändert seit“: kleine Datenmenge, Voll-Abgleich heilt verpasste Läufe selbst. Wabenhain nutzt sie seit `5642f0c`; seit `3bc0693` ausschließlich (kein Rückfall auf andere Endpunkte).
+3. ~~Nur-Lese-API-Schlüssel~~ – erledigt: Verwaltung → Automatisierung → API-Schlüssel. Nur Hash gespeichert, Klartext einmalig angezeigt, Scope nur `shop-sync:read`, widerrufbar, optional befristet, „zuletzt benutzt“ sichtbar. Wabenhain liest nur noch `APICORE_API_KEY`; der Passwort-Login ist entfernt (`3bc0693`).
 4. Ende-zu-Ende-Test beider Systeme gegen Test-Instanzen.
 5. Merge/Push.
 
@@ -65,11 +69,24 @@ Umgesetzt in Wabenhain `d38f430` (AT: Entscheidungslogik; CR: DB-Ablauf der Serv
 
 1. **Wabenhain-Sync gegen echtes ApiCore** nicht Ende zu Ende getestet (keine Zugangsdaten/Testinstanz
    verbunden). Mapping, Client und Schutzlogik sind unit-getestet bzw. per Code geprüft.
-2. **Service-Konto statt API-Schlüssel**: Wabenhain meldet sich mit E-Mail/Passwort an. Ein
-   eigener, nur lesender API-Token-Mechanismus in ApiCore wäre sicherer – bewusst nicht ohne Absprache gebaut.
+2. ~~Service-Konto statt API-Schlüssel~~ – erledigt: nur noch API-Schlüssel mit Scope `shop-sync:read`.
 3. **Status „blockiert“** existiert im Aufgabenmodell nicht. Nicht ergänzt (Schemaänderung + fachliche Definition nötig).
 4. **Produktbeschreibung** aus ApiCore wird in Wabenhain übernommen und auf der öffentlichen
    Herkunftsseite gezeigt – gilt damit als öffentlich. Falls sie intern gemeint ist: klären.
 5. Automatische Vorschläge haben standardmäßig **keinen Termin** (keine erfundene Frist);
    je Regel über `config.dueInDays` einstellbar.
 6. Übrige Formulare/Seiten wurden nicht einzeln überarbeitet (Fokus: Heute, Aufgaben, Profil).
+
+## Bestandsbuch (Tierarzneimittel)
+
+Grundlage: Art. 108 VO (EU) 2019/6, abgeglichen mit dem Muster-Formblatt des Veterinäramts Kassel
+(Stand März 2026) und der FAQ des LGL Bayern. Gilt für jedes Tierarzneimittel, auch freiverkäufliche Säuren;
+Aufbewahrung 5 Jahre.
+
+- Export: Stand → „Bestandsbuch {Jahr}“ (`/export/treatment-log.pdf?year=&apiaryId=`), ein Blatt je Stand.
+- Gleiche Behandlungen mehrerer Völker (Mittel, Charge, Menge, Zeitraum, Bezug) stehen in einer Zeile.
+- Standort am Behandlungstag: seit dieser Version mit der Behandlung gespeichert (`Treatment.apiaryId`).
+  Für ältere Einträge aus der Umsetz-Historie abgeleitet; ist das unsicher, markiert `*` die Zeile.
+- Fehlende Pflichtangaben erscheinen als „FEHLT“ statt leer – das Blatt sieht nie vollständiger aus, als es ist.
+- Name und Anschrift des Halters: Verwaltung → Automatisierung → Stammdaten & Web. Erscheinen nur im
+  Bestandsbuch; die öffentliche Chargen-Seite gibt sie nachweislich nicht aus (Test in `public.service.spec.ts`).