diff --git a/config/config.go b/config/config.go
index 80b2e65..abd66e4 100644
--- a/config/config.go
+++ b/config/config.go
@@ -174,13 +174,27 @@ func (c *Config) GetMigrationFunc(dbDialect string) models.MigrationFunc {
 	switch dbDialect {
 	default:
 		return func(db *gorm.DB) error {
-			db.AutoMigrate(&models.User{})
-			db.AutoMigrate(&models.KeyStringValue{})
-			db.AutoMigrate(&models.Alias{})
-			db.AutoMigrate(&models.Heartbeat{})
-			db.AutoMigrate(&models.Summary{})
-			db.AutoMigrate(&models.SummaryItem{})
-			db.AutoMigrate(&models.LanguageMapping{})
+			if err := db.AutoMigrate(&models.User{}); err != nil {
+				return err
+			}
+			if err := db.AutoMigrate(&models.KeyStringValue{}); err != nil {
+				return err
+			}
+			if err := db.AutoMigrate(&models.Alias{}); err != nil {
+				return err
+			}
+			if err := db.AutoMigrate(&models.Heartbeat{}); err != nil {
+				return err
+			}
+			if err := db.AutoMigrate(&models.Summary{}); err != nil {
+				return err
+			}
+			if err := db.AutoMigrate(&models.SummaryItem{}); err != nil {
+				return err
+			}
+			if err := db.AutoMigrate(&models.LanguageMapping{}); err != nil {
+				return err
+			}
 			return nil
 		}
 	}
diff --git a/models/user.go b/models/user.go
index 031b0f1..988634f 100644
--- a/models/user.go
+++ b/models/user.go
@@ -9,7 +9,7 @@ func init() {
 type User struct {
 	ID               string     `json:"id" gorm:"primary_key"`
 	ApiKey           string     `json:"api_key" gorm:"unique"`
-	Email            string     `json:"email" gorm:"uniqueIndex:idx_user_email"`
+	Email            string     `json:"email" gorm:"uniqueIndex:idx_user_email; size:255"`
 	Password         string     `json:"-"`
 	CreatedAt        CustomTime `gorm:"type:timestamp; default:CURRENT_TIMESTAMP" swaggertype:"string" format:"date" example:"2006-01-02 15:04:05.000"`
 	LastLoggedInAt   CustomTime `gorm:"type:timestamp; default:CURRENT_TIMESTAMP" swaggertype:"string" format:"date" example:"2006-01-02 15:04:05.000"`