diff --git a/internal/dao/database.go b/internal/dao/database.go
index 58977d8bca..5142b8866e 100644
--- a/internal/dao/database.go
+++ b/internal/dao/database.go
@@ -194,6 +194,7 @@ func GetModelProviderManager() *models.ProviderManager {
 // autoMigrateSafely runs AutoMigrate and ignores duplicate index errors
 // This handles cases where indexes already exist (e.g., created by Python backend)
 func autoMigrateSafely(db *gorm.DB, model interface{}) error {
+	//err := db.Debug().AutoMigrate(model) // to print debug info
 	err := db.AutoMigrate(model)
 	if err == nil {
 		return nil
@@ -202,27 +203,27 @@ func autoMigrateSafely(db *gorm.DB, model interface{}) error {
 	// Check if error is MySQL duplicate index error (Error 1061)
 	errStr := err.Error()
 	if strings.Contains(errStr, "Error 1061") && strings.Contains(errStr, "Duplicate key name") {
-		common.Info("Index already exists, skipping", zap.String("error", errStr))
+		common.Warn("Index already exists, skipping", zap.String("error", errStr))
 		return nil
 	}
 
 	if strings.Contains(errStr, "Error 1060") && strings.Contains(errStr, "Duplicate column name") {
-		common.Info("Column already exists, skipping", zap.String("error", errStr))
+		common.Warn("Column already exists, skipping", zap.String("error", errStr))
 		return nil
 	}
 
 	if strings.Contains(errStr, "Error 1050") && strings.Contains(errStr, "Table") {
-		common.Info("Table already exists, skipping", zap.String("error", errStr))
+		common.Warn("Table already exists, skipping", zap.String("error", errStr))
 		return nil
 	}
 
 	if strings.Contains(errStr, "Error 1091") && strings.Contains(errStr, "Can't DROP") {
-		common.Info("Index/column already dropped, skipping", zap.String("error", errStr))
+		common.Warn("Index/column already dropped, skipping", zap.String("error", errStr))
 		return nil
 	}
 
 	if strings.Contains(errStr, "Error 1138") && strings.Contains(errStr, "Invalid use of NULL") {
-		common.Info("NULL value in existing rows, skipping migration change", zap.String("error", errStr))
+		common.Warn("NULL value in existing rows, skipping migration change", zap.String("error", errStr))
 		return nil
 	}
 
diff --git a/internal/entity/user.go b/internal/entity/user.go
index 6db5cfe38c..4a421419cb 100644
--- a/internal/entity/user.go
+++ b/internal/entity/user.go
@@ -24,7 +24,7 @@ type User struct {
 	AccessToken     *string    `gorm:"column:access_token;size:255;index" json:"access_token,omitempty"`
 	Nickname        string     `gorm:"column:nickname;size:100;not null;index" json:"nickname"`
 	Password        *string    `gorm:"column:password;size:255;index" json:"-"`
-	Email           string     `gorm:"column:email;size:255;not null;index" json:"email"`
+	Email           string     `gorm:"column:email;size:255;not null;unique" json:"email"`
 	Avatar          *string    `gorm:"column:avatar;type:longtext" json:"avatar,omitempty"`
 	Language        *string    `gorm:"column:language;size:32;index" json:"language,omitempty"`
 	ColorSchema     *string    `gorm:"column:color_schema;size:32;index" json:"color_schema,omitempty"`