refactor: [cleanup] kd_price_tables 레거시 단가 테이블 삭제 + 문서 업데이트

database/migrations/2026_03_17_100000_drop_kd_price_tables_table.php

@@ -0,0 +1,44 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * kd_price_tables 테이블 삭제
+ *
+ * 레거시 5130 단가 데이터를 임시 저장하던 테이블.
+ * EstimatePriceService가 items + item_details + prices 기반으로 전환 완료되어
+ * 더 이상 사용하지 않음.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::dropIfExists('kd_price_tables');
+    }
+
+    public function down(): void
+    {
+        Schema::create('kd_price_tables', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id')->default(287)->comment('경동기업 테넌트 ID');
+            $table->string('table_type', 50)->comment('테이블 유형: motor, shaft, pipe, angle, raw_material, bdmodels');
+            $table->string('item_code', 100)->nullable()->comment('품목 코드 (연동용)');
+            $table->string('item_name', 200)->nullable()->comment('품목명');
+            $table->string('category', 100)->nullable()->comment('분류');
+            $table->string('spec1', 100)->nullable()->comment('규격1');
+            $table->string('spec2', 100)->nullable()->comment('규격2');
+            $table->string('spec3', 100)->nullable()->comment('규격3');
+            $table->decimal('unit_price', 15, 2)->default(0)->comment('단가');
+            $table->string('unit', 20)->default('EA')->comment('단위');
+            $table->json('raw_data')->nullable()->comment('원본 JSON 데이터');
+            $table->boolean('is_active')->default(true)->comment('활성 여부');
+            $table->timestamps();
+
+            $table->index(['tenant_id', 'table_type']);
+            $table->index(['table_type', 'category']);
+            $table->index(['table_type', 'spec1', 'spec2']);
+        });
+    }
+};