feat:video_generations 테이블 마이그레이션 추가 (YouTube Shorts AI)

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

database/migrations/2026_02_15_200000_create_video_generations_table.php

@@ -0,0 +1,36 @@
+<?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('video_generations', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id');
+            $table->unsignedBigInteger('user_id');
+            $table->string('keyword', 255);
+            $table->string('title', 500)->nullable();
+            $table->json('scenario')->nullable();
+            $table->string('status', 50)->default('pending');
+            $table->tinyInteger('progress')->unsigned()->default(0);
+            $table->string('current_step', 100)->nullable();
+            $table->json('clips_data')->nullable();
+            $table->string('output_path', 500)->nullable();
+            $table->decimal('cost_usd', 8, 4)->default(0);
+            $table->text('error_message')->nullable();
+            $table->timestamps();
+
+            $table->index(['tenant_id', 'user_id']);
+            $table->index('status');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('video_generations');
+    }
+};