사용자 테넌트 소속 데이터 정리

backend/internal/bootstrap/bootstrap.go

@@ -37,6 +37,9 @@ func migrateSchemas(db *gorm.DB) error {
 	if err := dropLegacyTenantDomainUniqueIndex(db); err != nil {
 		return err
 	}
+	if err := dropLegacyUserCompanyColumns(db); err != nil {
+		return err
+	}
 
 	// Add all domain models here
 	return db.AutoMigrate(
@@ -61,6 +64,21 @@ func migrateSchemas(db *gorm.DB) error {
 	)
 }
 
+func dropLegacyUserCompanyColumns(db *gorm.DB) error {
+	if !db.Migrator().HasTable(&domain.User{}) {
+		return nil
+	}
+	for _, column := range []string{"company_code", "company_codes"} {
+		if !db.Migrator().HasColumn(&domain.User{}, column) {
+			continue
+		}
+		if err := db.Migrator().DropColumn(&domain.User{}, column); err != nil {
+			return fmt.Errorf("failed to drop legacy users.%s column: %w", column, err)
+		}
+	}
+	return nil
+}
+
 func dropLegacyTenantDomainUniqueIndex(db *gorm.DB) error {
 	if !db.Migrator().HasTable(&domain.TenantDomain{}) {
 		return nil