feat: allow a honey batch to be split across multiple storage containers

A batch that doesn't fit in one container (e.g. 125 kg across 5 x 25 kg
buckets) had no way to be represented - HoneyBatch.storageContainerId
is a single nullable FK. Adds HoneyBatchContainerAllocation as an
additive join table (container + amount per batch), independent of the
existing single-container/relocate() flow which still covers the
simple one-container case unchanged.

- GET/PUT/DELETE /honey-batches/:id/containers[/:containerId], reusing
  the existing honey-batches:relocate permission.
- Assigning a container is an upsert (@@unique on batch+container), and
  the total assigned is validated against the batch's own amount when
  known.
- New "Aufteilung auf mehrere Behälter" card on the honey batch detail
  page, alongside (not replacing) the existing storage card.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

ApiCore-Backend/prisma/migrations/20260904150000_add_honey_batch_container_allocations/migration.sql

@@ -0,0 +1,23 @@
+-- CreateTable
+CREATE TABLE "HoneyBatchContainerAllocation" (
+    "id" TEXT NOT NULL,
+    "honeyBatchId" TEXT NOT NULL,
+    "storageContainerId" TEXT NOT NULL,
+    "amount" DOUBLE PRECISION NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "HoneyBatchContainerAllocation_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "HoneyBatchContainerAllocation_storageContainerId_idx" ON "HoneyBatchContainerAllocation"("storageContainerId");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "HoneyBatchContainerAllocation_honeyBatchId_storageContaine_key" ON "HoneyBatchContainerAllocation"("honeyBatchId", "storageContainerId");
+
+-- AddForeignKey
+ALTER TABLE "HoneyBatchContainerAllocation" ADD CONSTRAINT "HoneyBatchContainerAllocation_honeyBatchId_fkey" FOREIGN KEY ("honeyBatchId") REFERENCES "HoneyBatch"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "HoneyBatchContainerAllocation" ADD CONSTRAINT "HoneyBatchContainerAllocation_storageContainerId_fkey" FOREIGN KEY ("storageContainerId") REFERENCES "StorageContainer"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

ApiCore-Backend/prisma/schema.prisma

@@ -708,9 +708,10 @@ model HoneyBatch {
   createdAt          DateTime          @default(now())
   updatedAt          DateTime          @updatedAt
 
-  measurements    HoneyMeasurement[]
+  measurements        HoneyMeasurement[]
-  bottlingBatches BottlingBatch[]
+  bottlingBatches     BottlingBatch[]
-  relocations     HoneyBatchRelocation[]
+  relocations         HoneyBatchRelocation[]
+  containerAllocations HoneyBatchContainerAllocation[]
 
   @@index([status])
   @@index([extractionId])
@@ -756,9 +757,10 @@ model StorageContainer {
   createdAt     DateTime               @default(now())
   updatedAt     DateTime               @updatedAt
 
-  honeyBatches    HoneyBatch[]
+  honeyBatches        HoneyBatch[]
-  relocationsFrom HoneyBatchRelocation[] @relation("RelocationFrom")
+  relocationsFrom     HoneyBatchRelocation[]          @relation("RelocationFrom")
-  relocationsTo   HoneyBatchRelocation[] @relation("RelocationTo")
+  relocationsTo       HoneyBatchRelocation[]           @relation("RelocationTo")
+  batchAllocations    HoneyBatchContainerAllocation[]
 
   @@index([status])
 }
@@ -781,6 +783,27 @@ model HoneyBatchRelocation {
   @@index([honeyBatchId, relocatedAt])
 }
 
+// Aufteilung einer Honigcharge auf mehrere Lagerbehälter (z.B. 125 kg auf 5
+// Eimer à 25 kg) - additiv zum obigen "primären" storageContainerId/
+// Umlagern-Fluss auf HoneyBatch, der weiterhin den einfachen Ein-Behälter-
+// Fall abdeckt; diese Tabelle bildet zusätzlich den Fall ab, dass eine
+// Charge zu groß für einen einzelnen Behälter ist. @@unique macht das
+// Zuweisen einer Menge zu einem Behälter ein Upsert (erneutes Zuweisen
+// überschreibt die Menge, statt einen Duplikat-Eintrag anzulegen).
+model HoneyBatchContainerAllocation {
+  id                 String           @id @default(cuid())
+  honeyBatchId       String
+  honeyBatch         HoneyBatch       @relation(fields: [honeyBatchId], references: [id])
+  storageContainerId String
+  storageContainer   StorageContainer @relation(fields: [storageContainerId], references: [id])
+  amount             Float
+  createdAt          DateTime         @default(now())
+  updatedAt          DateTime         @updatedAt
+
+  @@unique([honeyBatchId, storageContainerId])
+  @@index([storageContainerId])
+}
+
 enum StockCategory {
   HONEY
   CONSUMABLE

ApiCore-Backend/src/honey-batches/dto/set-honey-batch-container-allocation.dto.ts

@@ -0,0 +1,9 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { IsNumber, IsPositive } from 'class-validator';
+
+export class SetHoneyBatchContainerAllocationDto {
+  @ApiProperty({ description: 'Menge in kg in diesem Behälter' })
+  @IsNumber()
+  @IsPositive()
+  amount!: number;
+}

ApiCore-Backend/src/honey-batches/honey-batches.controller.ts

@@ -1,10 +1,12 @@
 import {
   Body,
   Controller,
+  Delete,
   Get,
   Param,
   Patch,
   Post,
+  Put,
   Query,
 } from '@nestjs/common';
 import { ApiBearerAuth, ApiTags } from '@nestjs/swagger';
@@ -16,6 +18,7 @@ import { CreateHoneyBatchDto } from './dto/create-honey-batch.dto';
 import { UpdateHoneyBatchDto } from './dto/update-honey-batch.dto';
 import { CreateHoneyMeasurementDto } from './dto/create-honey-measurement.dto';
 import { RelocateHoneyBatchDto } from './dto/relocate-honey-batch.dto';
+import { SetHoneyBatchContainerAllocationDto } from './dto/set-honey-batch-container-allocation.dto';
 import { HoneyBatchesService } from './honey-batches.service';
 
 @ApiTags('honey-batches')
@@ -48,6 +51,42 @@ export class HoneyBatchesController {
     return this.honeyBatchesService.findRelocations(id);
   }
 
+  @RequirePermission('honey-batches:read')
+  @Get(':id/containers')
+  listContainerAllocations(@Param('id') id: string) {
+    return this.honeyBatchesService.listContainerAllocations(id);
+  }
+
+  @RequirePermission('honey-batches:relocate')
+  @Put(':id/containers/:containerId')
+  setContainerAllocation(
+    @Param('id') id: string,
+    @Param('containerId') containerId: string,
+    @Body() dto: SetHoneyBatchContainerAllocationDto,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return this.honeyBatchesService.setContainerAllocation(
+      id,
+      containerId,
+      dto,
+      actor.id,
+    );
+  }
+
+  @RequirePermission('honey-batches:relocate')
+  @Delete(':id/containers/:containerId')
+  removeContainerAllocation(
+    @Param('id') id: string,
+    @Param('containerId') containerId: string,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return this.honeyBatchesService.removeContainerAllocation(
+      id,
+      containerId,
+      actor.id,
+    );
+  }
+
   @RequirePermission('honey-batches:relocate')
   @Post(':id/relocate')
   relocate(

ApiCore-Backend/src/honey-batches/honey-batches.service.spec.ts

@@ -1,4 +1,4 @@
-import { NotFoundException } from '@nestjs/common';
+import { BadRequestException, NotFoundException } from '@nestjs/common';
 import { HoneyBatchesService } from './honey-batches.service';
 import { PrismaService } from '../prisma/prisma.service';
 import { AuditLogService } from '../audit/audit-log.service';
@@ -17,6 +17,12 @@ describe('HoneyBatchesService', () => {
     honeyMeasurement: { create: jest.Mock };
     storageContainer: { findUnique: jest.Mock };
     honeyBatchRelocation: { create: jest.Mock; findMany: jest.Mock };
+    honeyBatchContainerAllocation: {
+      findMany: jest.Mock;
+      findUnique: jest.Mock;
+      upsert: jest.Mock;
+      delete: jest.Mock;
+    };
     $transaction: jest.Mock;
   };
   let auditLog: { record: jest.Mock };
@@ -57,6 +63,12 @@ describe('HoneyBatchesService', () => {
       honeyMeasurement: { create: jest.fn() },
       storageContainer: { findUnique: jest.fn() },
       honeyBatchRelocation: { create: jest.fn(), findMany: jest.fn() },
+      honeyBatchContainerAllocation: {
+        findMany: jest.fn().mockResolvedValue([]),
+        findUnique: jest.fn(),
+        upsert: jest.fn(),
+        delete: jest.fn(),
+      },
       $transaction: jest.fn(),
     };
     auditLog = { record: jest.fn() };
@@ -199,4 +211,147 @@ describe('HoneyBatchesService', () => {
       expect(findArg.where.honeyBatchId).toBe('batch-1');
     });
   });
+
+  describe('setContainerAllocation', () => {
+    it('throws NotFoundException when the container does not exist', async () => {
+      prisma.honeyBatch.findUnique.mockResolvedValue(honeyBatch);
+      prisma.storageContainer.findUnique.mockResolvedValue(null);
+
+      await expect(
+        service.setContainerAllocation(
+          'batch-1',
+          'missing',
+          { amount: 25 },
+          'user-1',
+        ),
+      ).rejects.toBeInstanceOf(NotFoundException);
+    });
+
+    it('allows splitting the batch amount across multiple containers (125 kg / 5 x 25 kg)', async () => {
+      prisma.honeyBatch.findUnique.mockResolvedValue({
+        ...honeyBatch,
+        amount: 125,
+      });
+      prisma.storageContainer.findUnique.mockResolvedValue({
+        id: 'bucket-5',
+      });
+      prisma.honeyBatchContainerAllocation.findMany.mockResolvedValue([
+        { storageContainerId: 'bucket-1', amount: 25 },
+        { storageContainerId: 'bucket-2', amount: 25 },
+        { storageContainerId: 'bucket-3', amount: 25 },
+        { storageContainerId: 'bucket-4', amount: 25 },
+      ]);
+      prisma.honeyBatchContainerAllocation.upsert.mockResolvedValue({
+        id: 'allocation-5',
+        honeyBatchId: 'batch-1',
+        storageContainerId: 'bucket-5',
+        amount: 25,
+      });
+
+      await service.setContainerAllocation(
+        'batch-1',
+        'bucket-5',
+        { amount: 25 },
+        'user-1',
+      );
+
+      expect(prisma.honeyBatchContainerAllocation.upsert).toHaveBeenCalledWith({
+        where: {
+          honeyBatchId_storageContainerId: {
+            honeyBatchId: 'batch-1',
+            storageContainerId: 'bucket-5',
+          },
+        },
+        create: {
+          honeyBatchId: 'batch-1',
+          storageContainerId: 'bucket-5',
+          amount: 25,
+        },
+        update: { amount: 25 },
+        include: { storageContainer: true },
+      });
+    });
+
+    it('rejects an allocation that would exceed the batch amount', async () => {
+      prisma.honeyBatch.findUnique.mockResolvedValue({
+        ...honeyBatch,
+        amount: 100,
+      });
+      prisma.storageContainer.findUnique.mockResolvedValue({ id: 'bucket-1' });
+      prisma.honeyBatchContainerAllocation.findMany.mockResolvedValue([
+        { storageContainerId: 'bucket-2', amount: 80 },
+      ]);
+
+      await expect(
+        service.setContainerAllocation(
+          'batch-1',
+          'bucket-1',
+          { amount: 30 },
+          'user-1',
+        ),
+      ).rejects.toBeInstanceOf(BadRequestException);
+      expect(
+        prisma.honeyBatchContainerAllocation.upsert,
+      ).not.toHaveBeenCalled();
+    });
+
+    it('re-assigning the same container overwrites its own amount rather than double-counting it', async () => {
+      prisma.honeyBatch.findUnique.mockResolvedValue({
+        ...honeyBatch,
+        amount: 100,
+      });
+      prisma.storageContainer.findUnique.mockResolvedValue({ id: 'bucket-1' });
+      // findMany excludes the container being set (storageContainerId: { not: ... }),
+      // so its own prior amount never counts against itself here.
+      prisma.honeyBatchContainerAllocation.findMany.mockResolvedValue([]);
+      prisma.honeyBatchContainerAllocation.upsert.mockResolvedValue({
+        id: 'allocation-1',
+        honeyBatchId: 'batch-1',
+        storageContainerId: 'bucket-1',
+        amount: 90,
+      });
+
+      await expect(
+        service.setContainerAllocation(
+          'batch-1',
+          'bucket-1',
+          { amount: 90 },
+          'user-1',
+        ),
+      ).resolves.toBeDefined();
+    });
+  });
+
+  describe('removeContainerAllocation', () => {
+    it('throws NotFoundException when no allocation exists for that container', async () => {
+      prisma.honeyBatch.findUnique.mockResolvedValue(honeyBatch);
+      prisma.honeyBatchContainerAllocation.findUnique.mockResolvedValue(null);
+
+      await expect(
+        service.removeContainerAllocation('batch-1', 'bucket-1', 'user-1'),
+      ).rejects.toBeInstanceOf(NotFoundException);
+    });
+
+    it('deletes the allocation and records an audit entry', async () => {
+      prisma.honeyBatch.findUnique.mockResolvedValue(honeyBatch);
+      prisma.honeyBatchContainerAllocation.findUnique.mockResolvedValue({
+        id: 'allocation-1',
+        honeyBatchId: 'batch-1',
+        storageContainerId: 'bucket-1',
+        amount: 25,
+      });
+
+      await service.removeContainerAllocation('batch-1', 'bucket-1', 'user-1');
+
+      expect(prisma.honeyBatchContainerAllocation.delete).toHaveBeenCalledWith({
+        where: { id: 'allocation-1' },
+      });
+      expect(auditLog.record).toHaveBeenCalledWith(
+        expect.objectContaining({
+          entityType: 'HoneyBatchContainerAllocation',
+          action: 'DELETE',
+        }),
+      );
+    });
+  });
 });

ApiCore-Backend/src/honey-batches/honey-batches.service.ts

@@ -12,6 +12,7 @@ import { CreateHoneyBatchDto } from './dto/create-honey-batch.dto';
 import { UpdateHoneyBatchDto } from './dto/update-honey-batch.dto';
 import { CreateHoneyMeasurementDto } from './dto/create-honey-measurement.dto';
 import { RelocateHoneyBatchDto } from './dto/relocate-honey-batch.dto';
+import { SetHoneyBatchContainerAllocationDto } from './dto/set-honey-batch-container-allocation.dto';
 
 const honeyBatchInclude = {
   measurements: true,
@@ -160,6 +161,101 @@ export class HoneyBatchesService {
     return this.findById(id);
   }
 
+  // Additive to the single storageContainerId/relocate() flow above: covers
+  // a batch too large for one container (e.g. 125 kg split across 5 x 25 kg
+  // buckets). @@unique on [honeyBatchId, storageContainerId] makes this an
+  // upsert - re-assigning the same container just overwrites its amount.
+  async listContainerAllocations(id: string) {
+    await this.findById(id);
+    return this.prisma.honeyBatchContainerAllocation.findMany({
+      where: { honeyBatchId: id },
+      include: { storageContainer: true },
+      orderBy: { createdAt: 'asc' },
+    });
+  }
+
+  async setContainerAllocation(
+    id: string,
+    storageContainerId: string,
+    dto: SetHoneyBatchContainerAllocationDto,
+    actingUserId: string,
+  ) {
+    const honeyBatch = await this.findById(id);
+    const container = await this.prisma.storageContainer.findUnique({
+      where: { id: storageContainerId },
+    });
+    if (!container) {
+      throw new NotFoundException('Storage container not found');
+    }
+
+    const otherAllocations =
+      await this.prisma.honeyBatchContainerAllocation.findMany({
+        where: {
+          honeyBatchId: id,
+          storageContainerId: { not: storageContainerId },
+        },
+      });
+    const otherTotal = otherAllocations.reduce((sum, a) => sum + a.amount, 0);
+    if (
+      honeyBatch.amount !== null &&
+      otherTotal + dto.amount > honeyBatch.amount
+    ) {
+      throw new BadRequestException(
+        `Zugewiesene Menge (${otherTotal + dto.amount} kg) übersteigt die Chargenmenge (${honeyBatch.amount} kg)`,
+      );
+    }
+
+    const allocation = await this.prisma.honeyBatchContainerAllocation.upsert({
+      where: {
+        honeyBatchId_storageContainerId: {
+          honeyBatchId: id,
+          storageContainerId,
+        },
+      },
+      create: { honeyBatchId: id, storageContainerId, amount: dto.amount },
+      update: { amount: dto.amount },
+      include: { storageContainer: true },
+    });
+    await this.auditLog.record({
+      entityType: 'HoneyBatchContainerAllocation',
+      entityId: allocation.id,
+      action: 'UPDATE',
+      userId: actingUserId,
+      afterData: allocation,
+    });
+    return allocation;
+  }
+
+  async removeContainerAllocation(
+    id: string,
+    storageContainerId: string,
+    actingUserId: string,
+  ): Promise<void> {
+    await this.findById(id);
+    const allocation =
+      await this.prisma.honeyBatchContainerAllocation.findUnique({
+        where: {
+          honeyBatchId_storageContainerId: {
+            honeyBatchId: id,
+            storageContainerId,
+          },
+        },
+      });
+    if (!allocation) {
+      throw new NotFoundException('Zuweisung nicht gefunden');
+    }
+    await this.prisma.honeyBatchContainerAllocation.delete({
+      where: { id: allocation.id },
+    });
+    await this.auditLog.record({
+      entityType: 'HoneyBatchContainerAllocation',
+      entityId: allocation.id,
+      action: 'DELETE',
+      userId: actingUserId,
+      beforeData: allocation,
+    });
+  }
+
   async findRelocations(id: string) {
     await this.findById(id);
     return this.prisma.honeyBatchRelocation.findMany({

ApiCore-Frontend/src/app/(app)/honey-batches/[id]/honey-batch-container-allocations-card.tsx

@@ -0,0 +1,190 @@
+"use client";
+
+import { FormEvent, useState } from "react";
+import { Trash2 } from "lucide-react";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { toast } from "sonner";
+import {
+  fetchHoneyBatchContainerAllocations,
+  removeHoneyBatchContainerAllocation,
+  setHoneyBatchContainerAllocation,
+} from "@/lib/honey-batches/api";
+import { HoneyBatch } from "@/lib/honey-batches/types";
+import { fetchStorageContainers } from "@/lib/storage/api";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { EmptyState } from "@/components/empty-state";
+import { Boxes } from "lucide-react";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+
+// Additive to HoneyBatchStorageCard's single-container "Umlagern" flow above
+// it on the page - covers a batch too large for one container (e.g. 125 kg
+// split across 5 x 25 kg buckets), which a single storageContainerId can't
+// represent.
+export function HoneyBatchContainerAllocationsCard({ honeyBatch }: { honeyBatch: HoneyBatch }) {
+  const queryClient = useQueryClient();
+  const [storageContainerId, setStorageContainerId] = useState("");
+  const [amount, setAmount] = useState("");
+  const [error, setError] = useState<string | null>(null);
+
+  const { data: containers } = useQuery({
+    queryKey: ["storage-containers"],
+    queryFn: fetchStorageContainers,
+  });
+
+  const {
+    data: allocations,
+    isLoading,
+  } = useQuery({
+    queryKey: ["honey-batches", honeyBatch.id, "containers"],
+    queryFn: () => fetchHoneyBatchContainerAllocations(honeyBatch.id),
+  });
+
+  const assignMutation = useMutation({
+    mutationFn: (input: { storageContainerId: string; amount: number }) =>
+      setHoneyBatchContainerAllocation(honeyBatch.id, input.storageContainerId, input.amount),
+    onSuccess: () => {
+      void queryClient.invalidateQueries({
+        queryKey: ["honey-batches", honeyBatch.id, "containers"],
+      });
+      setStorageContainerId("");
+      setAmount("");
+      setError(null);
+    },
+    onError: () => {
+      setError("Zuweisung konnte nicht gespeichert werden. Übersteigt die Menge die Charge?");
+    },
+  });
+
+  const removeMutation = useMutation({
+    mutationFn: (containerId: string) =>
+      removeHoneyBatchContainerAllocation(honeyBatch.id, containerId),
+    onSuccess: () => {
+      void queryClient.invalidateQueries({
+        queryKey: ["honey-batches", honeyBatch.id, "containers"],
+      });
+      toast.success("Zuweisung entfernt");
+    },
+    onError: () => toast.error("Zuweisung konnte nicht entfernt werden"),
+  });
+
+  function handleSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setError(null);
+    if (!storageContainerId) {
+      setError("Bitte einen Lagerbehälter auswählen.");
+      return;
+    }
+    const parsedAmount = Number(amount);
+    if (!amount || parsedAmount <= 0) {
+      setError("Bitte eine Menge größer als 0 angeben.");
+      return;
+    }
+    assignMutation.mutate({ storageContainerId, amount: parsedAmount });
+  }
+
+  const totalAllocated = (allocations ?? []).reduce((sum, a) => sum + a.amount, 0);
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>Aufteilung auf mehrere Behälter</CardTitle>
+      </CardHeader>
+      <CardContent className="flex flex-col gap-4 text-sm">
+        <p className="text-xs text-muted-foreground">
+          Für Chargen, die nicht in einen einzigen Behälter passen (z. B. 125 kg auf 5 Eimer à 25
+          kg). Unabhängig vom Lagerbehälter oben.
+        </p>
+
+        {honeyBatch.amount !== null ? (
+          <p className="text-muted-foreground">
+            Zugewiesen: {totalAllocated} kg von {honeyBatch.amount} kg
+          </p>
+        ) : null}
+
+        {isLoading ? <p className="text-muted-foreground">Lädt…</p> : null}
+        {!isLoading && (!allocations || allocations.length === 0) ? (
+          <EmptyState
+            icon={Boxes}
+            title="Noch keine Aufteilung"
+            description="Weise dieser Charge unten mehrere Behälter mit jeweiliger Menge zu."
+          />
+        ) : null}
+        {allocations?.map((allocation) => (
+          <div
+            key={allocation.id}
+            className="flex items-center justify-between rounded-md border p-3"
+          >
+            <div>
+              <p className="font-medium">
+                {allocation.storageContainer.code}
+                {allocation.storageContainer.location
+                  ? ` · ${allocation.storageContainer.location}`
+                  : ""}
+              </p>
+              <p className="text-muted-foreground">{allocation.amount} kg</p>
+            </div>
+            <Button
+              type="button"
+              variant="ghost"
+              size="icon"
+              disabled={removeMutation.isPending}
+              onClick={() => removeMutation.mutate(allocation.storageContainerId)}
+              aria-label="Zuweisung entfernen"
+            >
+              <Trash2 className="size-4" />
+            </Button>
+          </div>
+        ))}
+
+        <form className="flex flex-col gap-3 border-t border-border/60 pt-4" onSubmit={handleSubmit}>
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="allocation-container">Behälter</Label>
+            <Select
+              value={storageContainerId}
+              onValueChange={(value) => setStorageContainerId(value ?? "")}
+            >
+              <SelectTrigger id="allocation-container">
+                <SelectValue placeholder="Lagerbehälter wählen" />
+              </SelectTrigger>
+              <SelectContent>
+                {containers?.map((container) => (
+                  <SelectItem key={container.id} value={container.id}>
+                    {container.code}
+                    {container.location ? ` · ${container.location}` : ""}
+                  </SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="allocation-amount">Menge (kg)</Label>
+            <Input
+              id="allocation-amount"
+              type="number"
+              inputMode="decimal"
+              value={amount}
+              onChange={(event) => setAmount(event.target.value)}
+            />
+          </div>
+          {error ? (
+            <p role="alert" className="text-sm text-destructive">
+              {error}
+            </p>
+          ) : null}
+          <Button type="submit" variant="outline" disabled={assignMutation.isPending}>
+            {assignMutation.isPending ? "Wird zugewiesen…" : "Behälter zuweisen"}
+          </Button>
+        </form>
+      </CardContent>
+    </Card>
+  );
+}

ApiCore-Frontend/src/app/(app)/honey-batches/[id]/page.tsx

@@ -11,6 +11,7 @@ import { QrCodeDialog } from "@/components/qr-code-dialog";
 import { DocumentUploadCard } from "@/components/document-upload-card";
 import { EmptyState } from "@/components/empty-state";
 import { HoneyBatchStorageCard } from "./honey-batch-storage-card";
+import { HoneyBatchContainerAllocationsCard } from "./honey-batch-container-allocations-card";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
@@ -83,6 +84,7 @@ export default function HoneyBatchDetailPage() {
             </CardContent>
           </Card>
           <HoneyBatchStorageCard honeyBatch={honeyBatch} />
+          <HoneyBatchContainerAllocationsCard honeyBatch={honeyBatch} />
         </div>
 
         <div className="flex flex-col gap-4 lg:col-span-2">

ApiCore-Frontend/src/lib/honey-batches/api.ts

@@ -3,6 +3,7 @@ import {
   CreateHoneyBatchInput,
   CreateHoneyMeasurementInput,
   HoneyBatch,
+  HoneyBatchContainerAllocation,
   HoneyBatchRelocation,
   HoneyBatchStatus,
   RelocateHoneyBatchInput,
@@ -69,3 +70,29 @@ export function relocateHoneyBatch(
 export function fetchHoneyBatchRelocations(id: string): Promise<HoneyBatchRelocation[]> {
   return apiFetch<HoneyBatchRelocation[]>(`/honey-batches/${id}/relocations`);
 }
+
+export function fetchHoneyBatchContainerAllocations(
+  id: string,
+): Promise<HoneyBatchContainerAllocation[]> {
+  return apiFetch<HoneyBatchContainerAllocation[]>(`/honey-batches/${id}/containers`);
+}
+
+export function setHoneyBatchContainerAllocation(
+  id: string,
+  containerId: string,
+  amount: number,
+): Promise<HoneyBatchContainerAllocation> {
+  return apiFetch<HoneyBatchContainerAllocation>(
+    `/honey-batches/${id}/containers/${containerId}`,
+    { method: "PUT", body: JSON.stringify({ amount }) },
+  );
+}
+
+export function removeHoneyBatchContainerAllocation(
+  id: string,
+  containerId: string,
+): Promise<void> {
+  return apiFetch<void>(`/honey-batches/${id}/containers/${containerId}`, {
+    method: "DELETE",
+  });
+}

ApiCore-Frontend/src/lib/honey-batches/types.ts

@@ -37,6 +37,14 @@ export interface HoneyBatch {
   measurements: HoneyMeasurement[];
 }
 
+export interface HoneyBatchContainerAllocation {
+  id: string;
+  honeyBatchId: string;
+  storageContainerId: string;
+  storageContainer: StorageContainerRef;
+  amount: number;
+}
+
 export interface HoneyBatchRelocation {
   id: string;
   fromStorageContainerId: string | null;