Create the projects part.

database/migrations/2025_01_22_092556_create_projects_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('projects', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('customer_id')->constrained();
+
+            $table->string('name');
+            $table->string('project_number');
+            $table->text('description')->nullable();
+            $table->date('start_date')->nullable();
+            $table->date('end_date')->nullable();
+
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('projects');
+    }
+};

database/migrations/2025_01_22_094543_add_information_to_invoices_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            $table->foreignId('project_id')->nullable()->constrained();
+            $table->integer('project_count')->nullable()->default(0);
+            $table->boolean('is_template')->default(false);
+            $table->string('currency_code')->default('EUR');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            $table->dropColumn('project_id');
+            $table->dropColumn('project_count');
+            $table->dropColumn('is_template');
+            $table->dropColumn('currency_code');
+        });
+    }
+};