manta/gofaster/backend/internal/auth/migration/add_unique_index.go

package migration

import (
	"fmt"

	"go.uber.org/zap"
	"gorm.io/gorm"
)

// AddUniqueIndexToFrontendBackendRoutes 为 frontend_backend_routes 表添加唯一索引
func AddUniqueIndexToFrontendBackendRoutes(db *gorm.DB, log *zap.Logger) error {
	log.Info("开始为 frontend_backend_routes 表添加唯一索引...")

	// 检查表是否存在
	if !db.Migrator().HasTable("frontend_backend_routes") {
		log.Info("frontend_backend_routes 表不存在，跳过添加唯一索引")
		return nil
	}

	// 检查唯一索引是否已存在
	var indexExists bool
	err := db.Raw(`
		SELECT COUNT(*) > 0 
		FROM pg_indexes 
		WHERE tablename = 'frontend_backend_routes' 
		AND indexname = 'idx_frontend_backend_routes_unique'
	`).Scan(&indexExists).Error

	if err != nil {
		log.Error("检查唯一索引是否存在失败", zap.Error(err))
		return fmt.Errorf("检查唯一索引失败: %w", err)
	}

	if indexExists {
		log.Info("唯一索引已存在，跳过创建")
		return nil
	}

	// 创建唯一索引
	err = db.Exec(`
		CREATE UNIQUE INDEX idx_frontend_backend_routes_unique 
		ON frontend_backend_routes (frontend_route_id, backend_route)
	`).Error

	if err != nil {
		log.Error("创建唯一索引失败", zap.Error(err))
		return fmt.Errorf("创建唯一索引失败: %w", err)
	}

	log.Info("✅ frontend_backend_routes 表唯一索引创建成功")
	return nil
}