fix: [절곡] bending_models lot_no 제거 — legacy_code로 이관

- bending_models에는 LOT 개념 없음, lot_no 컬럼 불필요
- lot_no 값 → legacy_code로 이관 후 컬럼 DROP
- BendingModel fillable에서 lot_no 제거
- GuiderailModelResource에서 lot_no 제거
- BendingModelImport: lot_no → legacy_code
- 마이그레이션 rollback 로직 수정

app/Console/Commands/BendingModelImport.php

@@ -121,7 +121,7 @@ private function importModel(object $row, string $type, string $code, array $dat
             'tenant_id' => $this->tenantId,
             'model_type' => $type,
             'code' => explode('-', $code)[0],
-            'lot_no' => $code,
+            'legacy_code' => $code,
             'legacy_num' => $row->num,
             'components' => $components,
             'material_summary' => $materialSummary,

app/Http/Resources/Api/V1/GuiderailModelResource.php

@@ -19,7 +19,6 @@ public function toArray(Request $request): array
         return [
             'id' => $this->id,
             'code' => $this->code,
-            'lot_no' => $this->lot_no,
             'name' => $this->name,
             'is_active' => $this->is_active,
             // MNG2 호환

app/Models/BendingModel.php

@@ -16,7 +16,7 @@ class BendingModel extends Model
     protected $table = 'bending_models';
 
     protected $fillable = [
-        'tenant_id', 'model_type', 'code', 'lot_no', 'name', 'legacy_code', 'legacy_num',
+        'tenant_id', 'model_type', 'code', 'name', 'legacy_code', 'legacy_num',
         'model_name', 'model_UA', 'item_sep', 'finishing_type', 'author', 'remark',
         'check_type', 'rail_width', 'rail_length',
         'exit_direction', 'front_bottom_width', 'box_width', 'box_height',

database/migrations/2026_03_21_100000_separate_code_and_lot_no_in_bending_tables.php

@@ -30,18 +30,14 @@ public function up(): void
             $table->index('code', 'idx_bending_code_type');
         });
 
-        // ── bending_models ──
-        Schema::table('bending_models', function (Blueprint $table) {
-            $table->string('lot_no', 100)->nullable()->after('code')->comment('전체 코드 (기존 code 값 이관)');
-        });
-
-        // 기존 code → lot_no 이관, code에는 접두사만 남기기 (GR-, SB-, BB-)
-        DB::statement("UPDATE bending_models SET lot_no = code, code = CASE
+        // ── bending_models ── (lot_no 불필요, legacy_code에 이관)
+        DB::statement("UPDATE bending_models SET legacy_code = code WHERE legacy_code IS NULL");
+        DB::statement("UPDATE bending_models SET code = CASE
             WHEN code LIKE 'GR-%' THEN 'GR'
             WHEN code LIKE 'SB-%' THEN 'SB'
             WHEN code LIKE 'BB-%' THEN 'BB'
             ELSE LEFT(code, 2)
-        END WHERE lot_no IS NULL");
+        END WHERE code LIKE '%-%'");
     }
 
     public function down(): void
@@ -61,10 +57,7 @@ public function down(): void
             $table->dropColumn('lot_no');
         });
 
-        // bending_models: lot_no → code 복원
-        DB::statement("UPDATE bending_models SET code = lot_no WHERE lot_no IS NOT NULL");
-        Schema::table('bending_models', function (Blueprint $table) {
-            $table->dropColumn('lot_no');
-        });
+        // bending_models: legacy_code → code 복원
+        DB::statement("UPDATE bending_models SET code = legacy_code WHERE legacy_code IS NOT NULL");
     }
 };