Add lot_prefix to products; compose LOT number from prefix + date suffix

Products now have a configurable lot_prefix (e.g. "112"). In the batch form
the prefix is shown read-only next to the suffix input (JJMMTT), and the full
lot_number (e.g. "112-260912") is composed automatically and stored.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -110,7 +110,7 @@ GET https://api.sms.spices.blue/api/v1/{lot_number}
 ```json
 {
   "data": {
-    "lot_number": "LOT-2024-001",
+    "lot_number": "112-260912",
     "produced_at": "2024-10-01",
     "expires_at":  "2026-10-01",
     "units_produced": 50,
@@ -220,6 +220,7 @@ Table packings {
 Table products {
     id int [pk]
     title text
+    lot_prefix varchar       -- Präfix für Chargennummer, z.B. "112"
     images json
     description text
     recipes_id int [ref: > recipes.id]

app/Filament/User/Resources/BatchResource.php

@@ -31,12 +31,6 @@ class BatchResource extends Resource
     {
         return $form->schema([
             Forms\Components\Section::make('Charge')->schema([
-                Forms\Components\TextInput::make('lot_number')
-                    ->label('LOT-Nummer')
-                    ->required()
-                    ->unique(ignoreRecord: true)
-                    ->maxLength(255),
-
                 Forms\Components\Select::make('product_id')
                     ->label('Produkt')
                     ->relationship('product', 'title')
@@ -44,7 +38,7 @@ class BatchResource extends Resource
                     ->preload()
                     ->required()
                     ->live()
-                    ->afterStateUpdated(function ($state, $set) {
+                    ->afterStateUpdated(function ($state, $set, $get) {
                         $set('size_id', null);
                         $set('recipe_id', null);
                         $set('origins', []);
@@ -62,8 +56,41 @@ class BatchResource extends Resource
                                 ])->toArray());
                             }
                         }
+                        $suffix = $get('lot_suffix');
+                        if ($suffix && $product?->lot_prefix) {
+                            $set('lot_number', $product->lot_prefix . '-' . $suffix);
+                        }
                     }),
 
+                Forms\Components\TextInput::make('lot_suffix')
+                    ->label('LOT-Nummer')
+                    ->prefix(fn (Get $get): ?string => Product::find($get('product_id'))?->lot_prefix
+                        ? Product::find($get('product_id'))->lot_prefix . ' -'
+                        : null
+                    )
+                    ->placeholder('JJMMTT')
+                    ->maxLength(50)
+                    ->required()
+                    ->dehydrated(false)
+                    ->live()
+                    ->afterStateHydrated(function ($component, $record) {
+                        if (! $record?->lot_number) return;
+                        $pos = strrpos($record->lot_number, '-');
+                        $component->state($pos !== false
+                            ? substr($record->lot_number, $pos + 1)
+                            : $record->lot_number
+                        );
+                    })
+                    ->afterStateUpdated(function ($state, $set, $get) {
+                        $product = Product::find($get('product_id'));
+                        $set('lot_number', $product?->lot_prefix
+                            ? $product->lot_prefix . '-' . $state
+                            : $state
+                        );
+                    }),
+
+                Forms\Components\Hidden::make('lot_number'),
+
                 Forms\Components\Select::make('size_id')
                     ->label('Variante (Verpackung)')
                     ->options(fn (Get $get) => ProductSize::with('packing')

app/Filament/User/Resources/ProductResource.php

@@ -41,6 +41,11 @@ class ProductResource extends Resource {
                 Forms\Components\TextInput::make('title')
                     ->label('Name')
                     ->required(),
+                Forms\Components\TextInput::make('lot_prefix')
+                    ->label('Chargen-Präfix')
+                    ->placeholder('z.B. 112')
+                    ->unique(ignoreRecord: true)
+                    ->maxLength(20),
                 Placeholder::make('shopify_product_id')
                     ->label('Shopify ID')
                     ->content(fn ($record) => $record?->shopify_product_id

app/Filament/User/Resources/ProductResource/RelationManagers/BatchesRelationManager.php

@@ -24,11 +24,31 @@ class BatchesRelationManager extends RelationManager
     public function form(Form $form): Form
     {
         return $form->schema([
-            Forms\Components\TextInput::make('lot_number')
+            Forms\Components\TextInput::make('lot_suffix')
                 ->label('LOT-Nummer')
+                ->prefix(fn ($livewire): ?string => $livewire->getOwnerRecord()->lot_prefix
+                    ? $livewire->getOwnerRecord()->lot_prefix . ' -'
+                    : null
+                )
+                ->placeholder('JJMMTT')
+                ->maxLength(50)
                 ->required()
-                ->unique(ignoreRecord: true)
+                ->dehydrated(false)
-                ->maxLength(255),
+                ->live()
+                ->afterStateHydrated(function ($component, $record) {
+                    if (! $record?->lot_number) return;
+                    $pos = strrpos($record->lot_number, '-');
+                    $component->state($pos !== false
+                        ? substr($record->lot_number, $pos + 1)
+                        : $record->lot_number
+                    );
+                })
+                ->afterStateUpdated(function ($state, $set, $livewire) {
+                    $prefix = $livewire->getOwnerRecord()->lot_prefix;
+                    $set('lot_number', $prefix ? "{$prefix}-{$state}" : $state);
+                }),
+
+            Forms\Components\Hidden::make('lot_number'),
 
             Forms\Components\Select::make('size_id')
                 ->label('Variante (Verpackung)')

app/Models/Product.php

@@ -7,7 +7,7 @@ use Illuminate\Database\Eloquent\Model;
 
 class Product extends Model
 {
-    protected $fillable = ['title', 'description', 'images', 'package_content', 'recipes_id', 'shopify_product_id'];
+    protected $fillable = ['title', 'lot_prefix', 'description', 'images', 'package_content', 'recipes_id', 'shopify_product_id'];
 
     protected $casts = [
         'images' => 'array',

database/migrations/2026_09_12_230000_add_lot_prefix_to_products.php

@@ -0,0 +1,22 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('products', function (Blueprint $table) {
+            $table->string('lot_prefix')->nullable()->unique()->after('title');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('products', function (Blueprint $table) {
+            $table->dropColumn('lot_prefix');
+        });
+    }
+};