add auth sessions

backend/database/migrations/2026_07_31_000000_create_auth_sessions_table.php

@@ -0,0 +1,25 @@
+<?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::create('auth_sessions', function (Blueprint $table): void {
+            $table->string('token', 64)->primary();
+            $table->foreignId('user_id')
+                ->constrained('users')
+                ->cascadeOnDelete();
+            $table->timestamp('created_at');
+            $table->timestamp('expires_at')->index();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('auth_sessions');
+    }
+};