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From: =?UTF-8?q?=EA=B9=80=EB=B3=B4=EA=B3=A4?=
 <lightone2017@codebridge-x.com>
Date: Sat, 28 Feb 2026 21:23:19 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20[interview]=20=EC=B9=B4=ED=85=8C?=
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- interview_categories 테이블에 parent_id 컬럼 추가
- self-referencing FK, nullOnDelete
---
 ...arent_id_to_interview_categories_table.php | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 database/migrations/2026_02_28_100005_add_parent_id_to_interview_categories_table.php

diff --git a/database/migrations/2026_02_28_100005_add_parent_id_to_interview_categories_table.php b/database/migrations/2026_02_28_100005_add_parent_id_to_interview_categories_table.php
new file mode 100644
index 0000000..8b926b8
--- /dev/null
+++ b/database/migrations/2026_02_28_100005_add_parent_id_to_interview_categories_table.php
@@ -0,0 +1,26 @@
+<?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::table('interview_categories', function (Blueprint $table) {
+            $table->unsignedBigInteger('parent_id')->nullable()->after('interview_project_id')->comment('부모 카테고리 ID (대분류→중분류)');
+            $table->index('parent_id', 'idx_interview_categories_parent');
+            $table->foreign('parent_id')->references('id')->on('interview_categories')->nullOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('interview_categories', function (Blueprint $table) {
+            $table->dropForeign(['parent_id']);
+            $table->dropIndex('idx_interview_categories_parent');
+            $table->dropColumn('parent_id');
+        });
+    }
+};