feat: add migrations

database/migrations/2026_05_17_120004_create_slots_table.php

@@ -0,0 +1,23 @@
+<?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('slots', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedInteger('capacity');
+            $table->unsignedInteger('remaining');
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('slots');
+    }
+};

database/migrations/2026_05_17_120022_create_holds_table.php

@@ -0,0 +1,27 @@
+<?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('holds', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('slot_id')->constrained()->cascadeOnDelete();
+            $table->uuid('idempotency_key')->unique();
+            $table->string('status', 20);
+            $table->timestamp('expires_at');
+            $table->timestamps();
+
+            $table->index(['slot_id', 'status', 'expires_at']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('holds');
+    }
+};