diff --git a/app/Models/Customer.php b/app/Models/Customer.php
index 979a6e4..81f7a23 100644
--- a/app/Models/Customer.php
+++ b/app/Models/Customer.php
@@ -4,6 +4,7 @@
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
 
@@ -11,8 +12,15 @@ class Customer extends Model
 {
     use HasFactory, SoftDeletes;
 
-    public function users()
+
+    public function invoices(): HasMany
+    {
+        return $this->hasMany(Invoice::class);
+    }
+
+    public function users(): HasMany
     {
         return $this->hasMany(User::class);
     }
+
 }
diff --git a/app/Models/User.php b/app/Models/User.php
index 727bc94..d77bcc2 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -4,6 +4,7 @@
 
 // use Illuminate\Contracts\Auth\MustVerifyEmail;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
@@ -44,7 +45,7 @@ class User extends Authenticatable
         'password' => 'hashed',
     ];
 
-    public function customer()
+    public function customer(): BelongsTo
     {
         return $this->belongsTo(Customer::class);
     }
diff --git a/database/migrations/2014_10_12_000000_create_users_table.php b/database/migrations/2014_10_12_000000_create_users_table.php
index 95cbca9..ed428a2 100644
--- a/database/migrations/2014_10_12_000000_create_users_table.php
+++ b/database/migrations/2014_10_12_000000_create_users_table.php
@@ -12,6 +12,7 @@ public function up(): void
     {
         Schema::create('users', function (Blueprint $table) {
             $table->id();
+            $table->foreignId('customer_id')->nullable();
             $table->string('name');
             $table->string('email')->unique();
             $table->timestamp('email_verified_at')->nullable();
diff --git a/database/migrations/2024_01_26_092417_add_customer_id_to_users.php b/database/migrations/2024_01_26_092417_add_customer_id_to_users.php
deleted file mode 100644
index 9b2f18b..0000000
--- a/database/migrations/2024_01_26_092417_add_customer_id_to_users.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?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('users', function (Blueprint $table) {
-            $table->foreignId('customer_id')->after('id')->nullable();
-        });
-    }
-
-    /**
-     * Reverse the migrations.
-     */
-    public function down(): void
-    {
-        Schema::table('users', function (Blueprint $table) {
-            $table->dropConstrainedForeignId('customer_id');
-        });
-    }
-};